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100% found this document useful (5 votes)

3K views332 pages

Spring Boot Tutorial PDF

Uploaded by

Kirti Parmar

We take content rights seriously. If you suspect this is your content, claim it here.

Available Formats

Download as PDF, TXT or read online on Scribd

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Spring Boot

About the Tutorial

Spring Boot is an open source Java-based framework used to create a Micro Service. It is
developed by Pivotal Team. It is easy to create a stand-alone and production ready spring
applications using Spring Boot. Spring Boot contains a comprehensive infrastructure
support for developing a microservice and enables you to develop enterprise-ready
applications that you can “just run”.

Audience
This tutorial is designed for Java developers to understand and develop production-ready
spring applications with minimum configurations. It explores major features of Spring Boot
such as Starters, Auto-configuration, Beans, Actuator and more.

By the end of this tutorial, you will gain an intermediate level of expertise in Spring Boot.

Prerequisites
This tutorial is written for readers who have a prior experience of Java, Spring, Maven,
and Gradle. You can easily understand the concepts of Spring Boot if you have knowledge
on these concepts. It would be an additional advantage if you have an idea about writing
a RESTful Web Service. If you are a beginner, we suggest you to go through tutorials
related to these concepts before you start with Spring Boot.

Copyright and Disclaimer

All the content and graphics published in this e-book are the property of Tutorials Point (I)
Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish
any contents or a part of contents of this e-book in any manner without written consent
of the publisher.

We strive to update the contents of our website and tutorials as timely and as precisely as
possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt.
Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our
website or its contents including this tutorial. If you discover any errors on our website or
in this tutorial, please notify us at contact@tutorialspoint.com

i
Spring Boot

Table of Contents
About the Tutorial ........................................................................................................................................... i

Audience .................................................................................................................................................... i

Prerequisites .............................................................................................................................................. i

Copyright and Disclaimer ........................................................................................................................... i

Table of Contents ...................................................................................................................................... ii

1. SPRING BOOT – INTRODUCTION ............................................................................................. 1

What is Micro Service?.............................................................................................................................. 1

What is Spring Boot?................................................................................................................................. 1

Why Spring Boot? ..................................................................................................................................... 2

How does it work? .................................................................................................................................... 2

Spring Boot Starters .................................................................................................................................. 2

Auto Configuration ................................................................................................................................... 3

Spring Boot Application ............................................................................................................................ 4

Component Scan ....................................................................................................................................... 4

2. SPRING BOOT – QUICK START ................................................................................................. 6

Prerequisites ............................................................................................................................................. 6

Spring Boot CLI .......................................................................................................................................... 6

3. SPRING BOOT – BOOTSTRAPPING ........................................................................................... 8

Spring Initializer ........................................................................................................................................ 8

Maven....................................................................................................................................................... 9

Gradle ..................................................................................................................................................... 10

Class Path Dependencies ........................................................................................................................ 11

Main Method .......................................................................................................................................... 12

Write a Rest Endpoint ............................................................................................................................. 12

Create an Executable JAR ........................................................................................................................ 13

ii
Spring Boot

Run Hello World with Java ...................................................................................................................... 14

4. SPRING BOOT – TOMCAT DEPLOYMENT ............................................................................... 16

Spring Boot Servlet Initializer .................................................................................................................. 16

Setting Main Class ................................................................................................................................... 17

Update packaging JAR into WAR ............................................................................................................. 17

Packaging your Application ..................................................................................................................... 19

Deploy into Tomcat................................................................................................................................. 20

5. SPRING BOOT – BUILD SYSTEMS ........................................................................................... 25

Dependency Management ...................................................................................................................... 25

Maven Dependency ................................................................................................................................ 25

Gradle Dependency ................................................................................................................................ 26

6. SPRING BOOT – CODE STRUCTURE........................................................................................ 27

Default package ...................................................................................................................................... 27

Typical Layout ......................................................................................................................................... 27

6. SPRING BOOT – CODE STRUCTURE........................................................................................ 27

7. SPRING BOOT – SPRING BEANS AND DEPENDENCY INJECTION ............................................. 28

8. SPRING BOOT – RUNNERS ..................................................................................................... 29

Application Runner ................................................................................................................................. 29

Command Line Runner ............................................................................................................................ 30

9. SPRING BOOT – APPLICATION PROPERTIES ........................................................................... 31

Command Line Properties ....................................................................................................................... 31

Properties File ......................................................................................................................................... 31

YAML File ................................................................................................................................................ 31

Externalized Properties ........................................................................................................................... 32

Use of @Value Annotation ..................................................................................................................... 32

iii
Spring Boot

Spring Boot Active Profile ....................................................................................................................... 33

10. SPRING BOOT – LOGGING ................................................................................................... 37

Log Format .............................................................................................................................................. 37

Console Log Output................................................................................................................................. 37

File Log Output ....................................................................................................................................... 37

Log Levels ............................................................................................................................................... 38

Configure Logback................................................................................................................................... 38

11. SPRING BOOT – BUILDING RESTFUL WEB SERVICES ............................................................ 41

Rest Controller ........................................................................................................................................ 43

Request Mapping .................................................................................................................................... 43

Request Body .......................................................................................................................................... 44

Path Variable .......................................................................................................................................... 44

Request Parameter ................................................................................................................................. 44

GET API ................................................................................................................................................... 44

POST API ................................................................................................................................................. 46

PUT API ................................................................................................................................................... 47

DELETE API .............................................................................................................................................. 48

12. SPRING BOOT – EXCEPTION HANDLING ............................................................................. 54

Controller Advice .................................................................................................................................... 54

Exception Handler ................................................................................................................................... 54

13. SPRING BOOT – INTERCEPTOR ............................................................................................ 62

14. SPRING BOOT – SERVLET FILTER.......................................................................................... 71

15. SPRING BOOT – TOMCAT PORT NUMBER ........................................................................... 77

Custom Port ............................................................................................................................................ 77

Random Port ........................................................................................................................................... 77

iv
Spring Boot

16. SPRING BOOT – REST TEMPLATE ......................................................................................... 78

GET ......................................................................................................................................................... 79

POST ....................................................................................................................................................... 80

PUT ......................................................................................................................................................... 81

DELETE .................................................................................................................................................... 82

17. SPRING BOOT – FILE HANDLING .......................................................................................... 89

File Upload .............................................................................................................................................. 89

File Download ......................................................................................................................................... 90

18. SPRING BOOT – SERVICE COMPONENTS ............................................................................. 96

19. SPRING BOOT – THYMELEAF ............................................................................................. 106

Thymeleaf Templates ............................................................................................................................ 106

Web Application ................................................................................................................................... 106

20. SPRING BOOT – CONSUMING RESTFUL WEB SERVICES ..................................................... 113

Angular JS ............................................................................................................................................. 122

21. SPRING BOOT – CORS SUPPORT ........................................................................................ 124

Enable CORS in Controller Method ....................................................................................................... 124

Global CORS Configuration ................................................................................................................... 124

22. SPRING BOOT – INTERNATIONALIZATION ......................................................................... 126

Dependencies ....................................................................................................................................... 126

LocaleResolver ...................................................................................................................................... 126

LocaleChangeInterceptor ...................................................................................................................... 127

Messages Sources ................................................................................................................................. 127

HTML file .............................................................................................................................................. 128

23. SPRING BOOT – SCHEDULING ........................................................................................... 134

Java Cron Expression ............................................................................................................................. 134

v
Spring Boot

Fixed Rate ............................................................................................................................................. 135

Fixed Delay ........................................................................................................................................... 136

24. SPRING BOOT – ENABLING HTTPS ..................................................................................... 138

Self-Signed Certificate ........................................................................................................................... 138

Configure HTTPS ................................................................................................................................... 139

25. SPRING BOOT – EUREKA SERVER ....................................................................................... 140

Building a Eureka Server ....................................................................................................................... 140

26. SPRING BOOT – SERVICE REGISTRATION WITH EUREKA .................................................... 146

27. SPRING BOOT – ZUUL PROXY SERVER AND ROUTING........................................................ 153

Creating Zuul Server Application ........................................................................................................... 153

28. SPRING BOOT – SPRING CLOUD CONFIGURATION SERVER ............................................... 160

Creating Spring Cloud Configuration Server .......................................................................................... 160

29. SPRING BOOT – SPRING CLOUD CONFIGURATION CLIENT ................................................ 166

Working with Spring Cloud Configuration Server .................................................................................. 166

30. SPRING BOOT – ACTUATOR ............................................................................................... 169

Enabling Spring Boot Actuator .............................................................................................................. 169

31. SPRING BOOT – ADMIN SERVER ........................................................................................ 171

32. SPRING BOOT – ADMIN CLIENT ......................................................................................... 176

33. SPRING BOOT – ENABLING SWAGGER2............................................................................. 179

34. SPRING BOOT – CREATING DOCKER IMAGE ...................................................................... 186

Create Dockerfile .................................................................................................................................. 186

Maven................................................................................................................................................... 186

Gradle ................................................................................................................................................... 190

35. SPRING BOOT – TRACING MICRO SERVICE LOGS ............................................................... 194

vi
Spring Boot

Spring Cloud Sleuth ............................................................................................................................... 194

Zipkin Server ......................................................................................................................................... 199

36. SPRING BOOT – FLYWAY DATABASE .................................................................................. 206

Configuring Flyway Database ................................................................................................................ 206

37. SPRING BOOT – SENDING EMAIL ....................................................................................... 213

38. SPRING BOOT – HYSTRIX ................................................................................................... 219

39. SPRING BOOT – WEB SOCKET............................................................................................ 226

40. SPRING BOOT – BATCH SERVICE........................................................................................ 235

41. SPRING BOOT – SPRING FOR APACHE KAFKA .................................................................... 244

Producing Messages ............................................................................................................................. 244

Consuming a Message ........................................................................................................................... 245

42. SPRING BOOT – TWILIO..................................................................................................... 252

Sending SMS ......................................................................................................................................... 252

Voice Calls ............................................................................................................................................. 257

43. SPRING BOOT – UNIT TEST CASES ..................................................................................... 262

Mockito ................................................................................................................................................ 262

44. SPRING BOOT – REST CONTROLLER UNIT TEST ................................................................. 269

Writing a Unit Test for REST Controller ................................................................................................. 269

45. SPRING BOOT – DATABASE HANDLING ............................................................................. 276

Connect to H2 database ........................................................................................................................ 276

Connect MySQL..................................................................................................................................... 277

Connect Redis ....................................................................................................................................... 279

JDBCTemplate ....................................................................................................................................... 280

Multiple DataSource ............................................................................................................................. 280

vii
Spring Boot

46. SPRING BOOT – SECURING WEB APPLICATIONS ................................................................ 284

Securing a Web application ................................................................................................................... 284

47. SPRING BOOT SECURITY – OAUTH2 WITH JWT ................................................................. 294

Authorization Server ............................................................................................................................. 294

Resource Server .................................................................................................................................... 294

OAuth2 ................................................................................................................................................. 294

JWT Token ............................................................................................................................................ 294

48. SPRING BOOT – GOOGLE CLOUD PLATFORM .................................................................... 311

Google Cloud SQL .................................................................................................................................. 314

49. SPRING BOOT – GOOGLE OAUTH2 SIGN-IN ....................................................................... 316

viii
1. Spring Boot – Introduction Spring Boot

Spring Boot is an open source Java-based framework used to create a micro Service. It is
developed by Pivotal Team and is used to build stand-alone and production ready spring
applications. This chapter will give you an introduction to Spring Boot and familiarizes you
with its basic concepts.

What is Micro Service?

Micro Service is an architecture that allows the developers to develop and deploy services
independently. Each service running has its own process and this achieves the lightweight
model to support business applications.

Advantages
Micro services offers the following advantages to its developers:

 Easy deployment
 Simple scalability
 Compatible with Containers
 Minimum configuration
 Lesser production time

What is Spring Boot?

Spring Boot provides a good platform for Java developers to develop a stand-alone and
production-grade spring application that you can just run. You can get started with
minimum configurations without the need for an entire Spring configuration setup.

Advantages
Spring Boot offers the following advantages to its developers:

 Easy to understand and develop spring applications

 Increases productivity
 Reduces the development time

Goals
Spring Boot is designed with the following goals:

 To avoid complex XML configuration in Spring

 To develop a production ready Spring applications in an easier way
 To reduce the development time and run the application independently
 Offer an easier way of getting started with the application

1
Spring Boot

Why Spring Boot?

You can choose Spring Boot because of the features and benefits it offers as given here:

 It provides a flexible way to configure Java Beans, XML configurations, and Database
Transactions.
 It provides a powerful batch processing and manages REST endpoints.
 In Spring Boot, everything is auto configured; no manual configurations are needed.
 It offers annotation-based spring application
 Eases dependency management
 It includes Embedded Servlet Container

How does it work?

Spring Boot automatically configures your application based on the dependencies you have
added to the project by using @EnableAutoConfiguration annotation. For example, if
MySQL database is on your classpath, but you have not configured any database
connection, then Spring Boot auto-configures an in-memory database.

The entry point of the spring boot application is the class contains
@SpringBootApplication annotation and the main method.

Spring Boot automatically scans all the components included in the project by using
@ComponentScan annotation.

Spring Boot Starters

Handling dependency management is a difficult task for big projects. Spring Boot resolves
this problem by providing a set of dependencies for developers convenience.

For example, if you want to use Spring and JPA for database access, it is sufficient if you
include spring-boot-starter-data-jpa dependency in your project.

Note that all Spring Boot starters follow the same naming pattern spring-boot-starter-
*, where * indicates that it is a type of the application.

Examples
Look at the following Spring Boot starters explained below for a better understanding:

Spring Boot Starter Actuator dependency is used to monitor and manage your
application. Its code is shown below:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

2
Spring Boot

Spring Boot Starter Security dependency is used for Spring Security. Its code is shown
below:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>

Spring Boot Starter web dependency is used to write a Rest Endpoints. Its code is
shown below:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

Spring Boot Starter Thyme Leaf dependency is used to create a web application. Its
code is shown below:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

Spring Boot Starter Test dependency is used for writing Test cases. Its code is shown
below:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>

Auto Configuration
Spring Boot Auto Configuration automatically configures your Spring application based on
the JAR dependencies you added in the project. For example, if MySQL database is on your
class path, but you have not configured any database connection, then Spring Boot auto-
configures an in-memory database.

For this purpose, you need to add @EnableAutoConfiguration annotation or

@SpringBootApplication annotation to your main class file. Then, your Spring Boot
application will be automatically configured.

3
Spring Boot

Observe the following code for a better understanding:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

@EnableAutoConfiguration
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}

Spring Boot Application

The entry point of the Spring Boot Application is the class contains
@SpringBootApplication annotation. This class should have the main method to run the
Spring Boot application. @SpringBootApplication annotation includes Auto-
Configuration, Component Scan, and Spring Boot Configuration.

If you added @SpringBootApplication annotation to the class, you do not need to add
the @EnableAutoConfiguration, @ComponentScan and @SpringBootConfiguration
annotation. The @SpringBootApplication annotation includes all other annotations.

Observe the following code for a better understanding:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}

Component Scan
Spring Boot application scans all the beans and package declarations when the application
initializes. You need to add the @ComponentScan annotation for your class file to scan
your components added in your project.

Observe the following code for a better understanding:

import org.springframework.boot.SpringApplication;

4
Spring Boot

import org.springframework.context.annotation.ComponentScan;

@ComponentScan
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}
}

5
2. Spring Boot – Quick Start Spring Boot

This chapter will teach you how to create a Spring Boot application using Maven and
Gradle.

Prerequisites
Your system need to have the following minimum requirements to create a Spring Boot
application:

 Java 7
 Maven 3.2
 Gradle 2.5

Spring Boot CLI

The Spring Boot CLI is a command line tool and it allows us to run the Groovy scripts. This
is the easiest way to create a Spring Boot application by using the Spring Boot Command
Line Interface. You can create, run and test the application in command prompt itself.

This section explains you the steps involved in manual installation of Spring Boot CLI . For
further help, you can use the following link: https://docs.spring.io/spring-
boot/docs/current-SNAPSHOT/reference/htmlsingle/#getting-started-installing-spring-
boot

You can also download the Spring CLI distribution from the Spring Software repository at:
https://docs.spring.io/spring-boot/docs/current-
SNAPSHOT/reference/htmlsingle/#getting-started-manual-cli-installation

For manual installation, you need to use the following two folders:

 spring-boot-cli-2.0.0.BUILD-SNAPSHOT-bin.zip
 spring-boot-cli-2.0.0.BUILD-SNAPSHOT-bin.tar.gz

After the download, unpack the archive file and follow the steps given in the install.txt file.
Not that it does not require any environment setup.

In Windows, go to the Spring Boot CLI bin directory in the command prompt and run the
command spring –-version to make sure spring CLI is installed correctly. After executing
the command, you can see the spring CLI version as shown below:

6
Spring Boot

Run Hello World with Groovy

Create a simple groovy file which contains the Rest Endpoint script and run the groovy file
with spring boot CLI. Observe the code shown here for this purpose:

@Controller
class Example {
@RequestMapping("/")
@ResponseBody
public String hello() {
"Hello Spring Boot"
}
}

Now, save the groovy file with the name hello.groovy. Note that in this example, we
saved the groovy file inside the Spring Boot CLI bin directory. Now run the application by
using the command spring run hello.groovy as shown in the screenshot given below:

Once you run the groovy file, required dependencies will download automatically and it
will start the application in Tomcat 8080 port as shown in the screenshot given below:

Once Tomcat starts, go to the web browser and hit the URL http://localhost:8080/,
and you can see the output as shown.

7
3. Spring Boot – Bootstrapping Spring Boot

This chapter will explain you how to perform bootstrapping on a Spring Boot application.

Spring Initializer
One of the ways to Bootstrapping a Spring Boot application is by using Spring Initializer.
To do this, you will have to visit the Spring Initializer web page http://start.spring.io/ and
choose your Build, Spring Boot Version and platform. Also, you need to provide a Group,
Artifact and required dependencies to run the application.

Observe the following screenshot that shows an example where we added the spring-
boot-starter-web dependency to write REST Endpoints.

Once you provided the Group, Artifact, Dependencies, Build Project, Platform and Version,
click Generate Project button. The zip file will download and the files will be extracted.

This section explains you the examples by using both Maven and Gradle.

8
Spring Boot

Maven
After you download the project, unzip the file. Now, your pom.xml file looks as shown
below:

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>demo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/> 
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>

9
Spring Boot

</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Gradle
Once you download the project, unzip the file. Now your build.gradle file looks as shown
below:

apply plugin: 'eclipse'

10
Spring Boot

apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

Class Path Dependencies

Spring Boot provides a number of Starters to add the jars in our class path. For example,
for writing a Rest Endpoint, we need to add the spring-boot-starter-web dependency
in our class path. Observe the codes shown below for a better understanding:

Maven dependency

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>

Gradle dependency

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
}

11
Spring Boot

Main Method
The main method should be writing the Spring Boot Application class. This class should be
annotated with @SpringBootApplication. This is the entry point of the spring boot
application to start. You can find the main class file under src/java/main directories with
the default package.

In this example, the main class file is located at the src/java/main directories with the
default package com.tutorialspoint.demo. Observe the code shown here for a better
understanding:

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}

Write a Rest Endpoint

To write a simple Hello World Rest Endpoint in the Spring Boot Application main class file
itself, follow the steps shown below:

 Firstly, add the @RestController annotation at the top of the class.

 Now, write a Request URI method with @RequestMapping annotation.
 Then, the Request URI method should return the Hello World string.
Now, your main Spring Boot Application class file will look like as shown in the code given
below:

package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@RestController
public class DemoApplication {

12
Spring Boot

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

@RequestMapping(value="/")
public String hello() {
return "Hello World";
}
}

Create an Executable JAR

Let us create an executable JAR file to run the Spring Boot application by using Maven and
Gradle commands in the command prompt as shown below:

Use the Maven command mvn clean install as shown below:

After executing the command, you can see the BUILD SUCCESS message at the
command prompt as shown below:

Use the Gradle command gradle clean build as shown below:

13
Spring Boot

After executing the command, you can see the BUILD SUCCESSFUL message in the
command prompt as shown below:

Run Hello World with Java

Once you have created an executable JAR file, you can find it under the following
directories.

For Maven, you can find the JAR file under the target directory as shown below:

14
Spring Boot

For Gradle, you can find the JAR file under the build/libs directory as shown below:

Now, run the JAR file by using the command java –jar <JARFILE>. Observe that in the
above example, the JAR file is named demo-0.0.1-SNAPSHOT.jar

Once you run the jar file, you can see the output in the console window as shown below:

Now, look at the console, Tomcat started on port 8080 (http). Now, go to the web browser
and hit the URL http://localhost:8080/ and you can see the output as shown below:

15
4. Spring Boot – Tomcat Deployment Spring Boot

By using Spring Boot application, we can create a war file to deploy into the web server.
In this chapter, you are going to learn how to create a WAR file and deploy the Spring
Boot application in Tomcat web server.

Spring Boot Servlet Initializer

The traditional way of deployment is making the Spring Boot Application
@SpringBootApplication class extend the SpringBootServletInitializer class. Spring
Boot Servlet Initializer class file allows you to configure the application when it is launched
by using Servlet Container.

The code for Spring Boot Application class file for JAR file deployment is given below:

package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}

We need to extend the class SpringBootServletInitializer to support WAR file

deployment. The code of Spring Boot Application class file is given below:

package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder
application) {

return application.sources(DemoApplication.class);

16
Spring Boot

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}
}

Setting Main Class

In Spring Boot, we need to mention the main class that should start in the build file. For
this purpose, you can use the following pieces of code:

For Maven, add the start class in pom.xml properties as shown below:

<start-class>com.tutorialspoint.demo.DemoApplication</start-class>

For Gradle, add the main class name in build.gradle as shown below:

mainClassName="com.tutorialspoint.demo.DemoApplication"

Update packaging JAR into WAR

We have to update the packaging JAR into WAR using the following pieces of code:

For Maven, add the packaging as WAR in pom.xml as shown below:

For Gradle, add the application plugin and war plugin in the build.gradle as shown below:

apply plugin: ‘war’

apply plugin: ‘application’

Now, let us write a simple Rest Endpoint to return the string “Hello World from Tomcat”.
To write a Rest Endpoint, we need to add the Spring Boot web starter dependency into
our build file.

For Maven, add the Spring Boot starter dependency in pom.xml using the code as shown
below:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

17
Spring Boot

For Gradle, add the Spring Boot starter dependency in build.gradle using the code as
shown below:

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
}

Now, write a simple Rest Endpoint in Spring Boot Application class file using the code as
shown below:

package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication extends SpringBootServletInitializer {

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder
application) {
return application.sources(DemoApplication.class);
}

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

@RequestMapping(value="/")
public String hello() {
return "Hello World from Tomcat";
}
}

18
Spring Boot

Packaging your Application

Now, create a WAR file to deploy into the Tomcat server by using Maven and Gradle
commands for packaging your application as given below:

For Maven, use the command mvn package for packaging your application. Then, the
WAR file will be created and you can find it in the target directory as shown in the
screenshots given below:

For Gradle, use the command gradle clean build for packaging your application. Then,
your WAR file will be created and you can find it under build/libs directory. Observe the
screenshots given here for a better understanding:

19
Spring Boot

Deploy into Tomcat

Now, run the Tomcat Server, and deploy the WAR file under the webapps directory.
Observe the screenshots shown here for a better understanding:

20
Spring Boot

After successful deployment, hit the URL in your web browser http://localhost:8080/demo-
0.0.1-SNAPSHOT/ and observe that the output will look as shown in the screenshot given
below:

The full code for this purpose is given below.

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/> 
</parent>

21
Spring Boot

<start-class>com.tutorialspoint.demo.DemoApplication</start-class>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

build.gradle

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {

22
Spring Boot

classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")

}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'war'
apply plugin: 'application'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
mainClassName="com.tutorialspoint.demo.DemoApplication"
repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

The code for main Spring Boot application class file is given below:

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication extends SpringBootServletInitializer {

23
Spring Boot

@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder
application) {
return application.sources(DemoApplication.class);
}

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

@RequestMapping(value="/")
public String hello() {
return "Hello World from Tomcat";
}
}

24
5. Spring Boot – Build Systems Spring Boot

In Spring Boot, choosing a build system is an important task. We recommend Maven or

Gradle as they provide a good support for dependency management. Spring does not
support well other build systems.

Dependency Management
Spring Boot team provides a list of dependencies to support the Spring Boot version for
its every release. You do not need to provide a version for dependencies in the build
configuration file. Spring Boot automatically configures the dependencies version based
on the release. Remember that when you upgrade the Spring Boot version, dependencies
also will upgrade automatically.

Note: If you want to specify the version for dependency, you can specify it in your
configuration file. However, the Spring Boot team highly recommends that it is not needed
to specify the version for dependency.

Maven Dependency
For Maven configuration, we should inherit the Spring Boot Starter parent project to
manage the Spring Boot Starters dependencies. For this, simply we can inherit the starter
parent in our pom.xml file as shown below.

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
</parent>

We should specify the version number for Spring Boot Parent Starter dependency. Then
for other starter dependencies, we do not need to specify the Spring Boot version number.
Observe the code given below:

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>

25
Spring Boot

Gradle Dependency
We can import the Spring Boot Starters dependencies directly into build.gradle file. We
do not need Spring Boot start Parent dependency like Maven for Gradle. Observe the code
given below:

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

Similarly, in Gradle, we need not specify the Spring Boot version number for dependencies.
Spring Boot automatically configures the dependency based on the version.

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
}

26
6. Spring Boot – Code Structure Spring Boot

Spring Boot does not have any code layout to work with. However, there are some best
practices that will help us. This chapter talks about them in detail.

Default package
A class that does not have any package declaration is considered as a default package.
Note that generally a default package declaration is not recommended. Spring Boot will
cause issues such as malfunctioning of Auto Configuration or Component Scan, when you
use default package.

Note: Java’s recommended naming convention for package declaration is reversed domain
name. For example: com.tutorialspoint.myproject

Typical Layout
The typical layout of Spring Boot application is shown in the image given below:

The Application.java file should declare the main method along with
@SpringBootApplication. Observe the code given below for a better understanding:

package com.tutorialspoint.myproject;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args); }}

27
7. Spring Boot – Spring Beans and Dependency Spring Boot

Injection

In Spring Boot, we can use Spring Framework to define our beans and their dependency
injection. The @ComponentScan annotation is used to find beans and the corresponding
injected with @Autowired annotation.

If you followed the Spring Boot typical layout, no need to specify any arguments for
@ComponentScan annotation. All component class files are automatically registered with
Spring Beans.

The following example provides an idea about Auto wiring the Rest Template object and
creating a Bean for the same:

@Bean
public RestTemplate getRestTemplate() {
return new RestTemplate();
}

The following code shows the code for auto wired Rest Template object and Bean creation
object in main Spring Boot Application class file:

package com.tutorialspoint.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
@SpringBootApplication
public class DemoApplication {
@Autowired
RestTemplate restTemplate;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Bean
public RestTemplate getRestTemplate() {
return new RestTemplate(); }
}

28
8. Spring Boot – Runners Spring Boot

Application Runner and Command Line Runner interfaces lets you to execute the code
after the Spring Boot application is started. You can use these interfaces to perform any
actions immediately after the application has started. This chapter talks about them in
detail.

Application Runner
Application Runner is an interface used to execute the code after the Spring Boot
application started. The example given below shows how to implement the Application
Runner interface on the main class file.

package com.tutorialspoint.demo;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication implements ApplicationRunner {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@Override
public void run(ApplicationArguments arg0) throws Exception {
System.out.println("Hello World from Application Runner");
}
}

Now, if you observe the console window below Hello World from Application Runner,
the println statement is executed after the Tomcat started. Is the following screenshot
relevant?

29
Spring Boot

Command Line Runner

Command Line Runner is an interface. It is used to execute the code after the Spring Boot
application started. The example given below shows how to implement the Command Line
Runner interface on the main class file.

package com.tutorialspoint.demo;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication implements CommandLineRunner {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}
@Override
public void run(String... arg0) throws Exception {
System.out.println("Hello world from Command Line Runner");
}
}

Look at the console window below “Hello world from Command Line Runner” println
statement is executed after the Tomcat started.

30
9. Spring Boot – Application Properties Spring Boot

Application Properties support us to work in different environments. In this chapter, you

are going to learn how to configure and specify the properties to a Spring Boot application.

Command Line Properties

Spring Boot application converts the command line properties into Spring Boot
Environment properties. Command line properties take precedence over the other
property sources. By default, Spring Boot uses the 8080 port number to start the Tomcat.
Let us learn how change the port number by using command line properties.

Step 1: After creating an executable JAR file, run it by using the command java –jar
<JARFILE>.

Step 2: Use the command given in the screenshot given below to change the port number
for Spring Boot application by using command line properties.

Note: You can provide more than one application properties by using the delimiter --.

Properties File
Properties files are used to keep ‘N’ number of properties in a single file to run the
application in a different environment. In Spring Boot, properties are kept in the
application.properties file under the classpath.

The application.properties file is located in the src/main/resources directory. The code

for sample application.properties file is given below:

server.port=9090
spring.application.name=demoservice

Note that in the code shown above the Spring Boot application demoservice starts on the
port 9090.

YAML File
Spring Boot supports YAML based properties configurations to run the application. Instead
of application.properties, we can use application.yml file. This YAML file also should
be kept inside the classpath. The sample application.yml file is given below:

31
Spring Boot

spring:
application:
name: demoservice
server:
port: 9090

Externalized Properties
Instead of keeping the properties file under classpath, we can keep the properties in
different location or path. While running the JAR file, we can specify the properties file
path. You can use the following command to specify the location of properties file while
running the JAR:

-Dspring.config.location=C:\application.properties

Use of @Value Annotation

The @Value annotation is used to read the environment or application property value in
Java code. The syntax to read the property value is shown below:

@Value("${property_key_name}")

Look at the following example that shows the syntax to read the
spring.application.name property value in Java variable by using @Value annotation.

@Value("${spring.application.name}")

Observe the code given below for a better understanding:

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication {

@Value("${spring.application.name}")

32
Spring Boot

private String name;

public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}

@RequestMapping(value="/")
public String name() {
return name;
}

Note: If the property is not found while running the application, Spring Boot throws the
Illegal Argument exception as Could not resolve placeholder
'spring.application.name' in value "${spring.application.name}".

To resolve the placeholder issue, we can set the default value for the property using thr
syntax given below:

@Value("${property_key_name:default_value}")
@Value("${spring.application.name:demoservice}")

Spring Boot Active Profile

Spring Boot supports different properties based on the Spring active profile. For example,
we can keep two separate files for development and production to run the Spring Boot
application.

Spring active profile in application.properties

Let us understand how to have Spring active profile in application.properties. By default,
application. properties will be used to run the Spring Boot application. If you want to use
profile based properties, we can keep separate properties file for each profile as shown
below:

application.properties

server.port=8080
spring.application.name=demoservice

application-dev.properties

server.port=9090
spring.application.name=demoservice

33
Spring Boot

application-prod.properties

server.port=4431
spring.application.name=demoservice

While running the JAR file, we need to specify the spring active profile based on each
properties file. By default, Spring Boot application uses the application.properties file. The
command to set the spring active profile is shown below:

You can see active profile name on the console log as shown below:

2017-11-26 08:13:16.322 INFO 14028 --- [ main]

com.tutorialspoint.demo.DemoApplication : The following profiles are active:
dev

Now, Tomcat has started on the port 9090 (http) as shown below:

2017-11-26 08:13:20.185 INFO 14028 --- [ main]

s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 9090
(http)

You can set the Production active profile as shown below:

You can see active profile name on the console log as shown below:

2017-11-26 08:13:16.322 INFO 14028 --- [ main]

com.tutorialspoint.demo.DemoApplication : The following profiles are active:
prod

Now, Tomcat started on the port 4431 (http) as shown below:

2017-11-26 08:13:20.185 INFO 14028 --- [ main]

s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 4431
(http)

Spring active profile for application.yml

Let us understand how to keep Spring active profile for application.yml. We can keep the
Spring active profile properties in the single application.yml file. No need to use the
separate file like application.properties.

The following is an example code to keep the Spring active profiles in application.yml file.
Note that the delimiter (---) is used to separate each profile in application.yml file.

34
Spring Boot

spring:
application:
name: demoservice
server:
port: 8080

---
spring:
profiles: dev
application:
name: demoservice
server:
port: 9090

---
spring:
profiles: prod
application:
name: demoservice
server:
port: 4431

To command to set development active profile is given below:

You can see active profile name on the console log as shown below:

2017-11-26 08:41:37.202 INFO 14104 --- [ main]

com.tutorialspoint.demo.DemoApplication : The following profiles are active:
dev

Now, Tomcat started on the port 9090 (http) as shown below:

2017-11-26 08:41:46.650 INFO 14104 --- [ main]

s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 9090
(http)

35
Spring Boot

The command to set Production active profile is given below:

You can see active profile name on the console log as shown below:

2017-11-26 08:43:10.743 INFO 13400 --- [ main]

com.tutorialspoint.demo.DemoApplication : The following profiles are active:
prod

This will start Tomcat on the port 4431 (http) as shown below:

2017-11-26 08:43:14.473 INFO 13400 --- [ main]

s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 4431
(http)

36
10. Spring Boot – Logging Spring Boot

Spring Boot uses Apache Commons logging for all internal logging. Spring Boot’s default
configurations provides a support for the use of Java Util Logging, Log4j2, and Logback.
Using these, we can configure the console logging as well as file logging.

If you are using Spring Boot Starters, Logback will provide a good support for logging.
Besides, Logback also provides a use of good support for Common Logging, Util Logging,
Log4J, and SLF4J.

Log Format
The default Spring Boot Log format is shown in the screenshot given below.

which gives you the following information:

 Date and Time that gives the date and time of the log
 Log level shows INFO, ERROR or WARN
 Process ID

 The --- which is a separator

 Thread name is enclosed within the square brackets []
 Logger Name that shows the Source class name
 The Log message

Console Log Output

The default log messages will print to the console window. By default, “INFO”, “ERROR”
and “WARN” log messages will print in the log file.

If you have to enable the debug level log, add the debug flag on starting your application
using the command shown below:

java –jar demo.jar --debug

You can also add the debug mode to your application.properties file as shown here:

debug=true

File Log Output

By default, all logs will print on the console window and not in the files. If you want to
print the logs in a file, you need to set the property logging.file or logging.path in the
application.properties file.

37
Spring Boot

You can specify the log file path using the property shown below. Note that the log file
name is spring.log.

logging.path=/var/tmp/

You can specify the own log file name using the property shown below:

logging.file=/var/tmp/mylog.log

Note: Log files will rotate automatically after reaching the size 10 MB.

Log Levels
Spring Boot supports all logger levels such as “TRACE”, “DEBUG”, “INFO”, “WARN”,
“ERROR”, “FATAL”, “OFF”. You can define Root logger in the application.properties file as
shown below:

logging.level.root=WARN

Note: Logback does not support “FATAL” level log. It is mapped to the “ERROR” level log.

Configure Logback
Logback supports XML based configuration to handle Spring Boot Log configurations.
Logging configuration details are configured in logback.xml file. The logback.xml file
should be placed under the classpath.

You can configure the ROOT level log in Logback.xml file using the code given below:

<?xml version="1.0" encoding="UTF-8"?>

You can configure the console appender in Logback.xml file given below.

<?xml version="1.0" encoding="UTF-8"?>

You can configure the file appender in Logback.xml file using the code given below. Note
that you need to specify the Log file path insider the file appender.

38
Spring Boot

<?xml version="1.0" encoding="UTF-8"?>

<configuration>
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<File>/var/tmp/mylog.log</File>
</appender>
<root level="INFO">
<appender-ref ref="FILE"/>
</root>
</configuration>

You can define the Log pattern in logback.xml file using the code given below. You can
also define the set of supported log patterns inside the console or file log appender using
the code given below:

<pattern>[%d{yyyy-MM-dd'T'HH:mm:ss.sss'Z'}] [%C] [%t] [%L] [%-5p]

%m%n</pattern>

The code for complete logback.xml file is given below. You have to place this in the class
path.

<?xml version="1.0" encoding="UTF-8"?>

<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>[%d{yyyy-MM-dd'T'HH:mm:ss.sss'Z'}] [%C] [%t] [%L] [%-5p]
%m%n</pattern>
</encoder>
</appender>
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
<File>/var/tmp/mylog.log</File>
<encoder>
<pattern>[%d{yyyy-MM-dd'T'HH:mm:ss.sss'Z'}] [%C] [%t] [%L] [%-5p]
%m%n</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="FILE"/>
<appender-ref ref="STDOUT"/>
</root>
</configuration>

39
Spring Boot

The code given below shows how to add the slf4j logger in Spring Boot main class file.

package com.tutorialspoint.demo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
private static final Logger logger =
LoggerFactory.getLogger(DemoApplication.class);
public static void main(String[] args) {
logger.info("this is a info message");
logger.warn("this is a warn message");
logger.error("this is a error message");
SpringApplication.run(DemoApplication.class, args);
}
}

The output that you can see in the console window is shown here:

The output that you can see in the log file is shown here:

40
11. Spring Boot – Building RESTful Web Services Spring Boot

Spring Boot provides a very good support to building RESTful Web Services for enterprise
applications. This chapter will explain in detail about building RESTful web services using
Spring Boot.

Note: For building a RESTful Web Services, we need to add the Spring Boot Starter Web
dependency into the build configuration file.

If you are a Maven user, use the following code to add the below dependency in your
pom.xml file:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

If you are a Gradle user, use the following code to add the below dependency in your
build.gradle file.

compile('org.springframework.boot:spring-boot-starter-web')

The code for complete build configuration file Maven build – pom.xml is given below:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.tutorialspoint</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>

41
Spring Boot

</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-
8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

The code for complete build configuration file Gradle Build – build.gradle is given below:

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {

42
Spring Boot

classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

Before you proceed to build a RESTful web service, it is suggested that you have knowledge
of the following annotations:

Rest Controller
The @RestController annotation is used to define the RESTful web services. It serves JSON,
XML and custom response. Its syntax is shown below:

@RestController
public class ProductServiceController {
}

Request Mapping
The @RequestMapping annotation is used to define the Request URI to access the REST
Endpoints. We can define Request method to consume and produce object. The default
request method is GET.

43
Spring Boot

@RequestMapping(value="/products")
public ResponseEntity<Object> getProducts() { }

Request Body
The @RequestBody annotation is used to define the request body content type.

public ResponseEntity<Object> createProduct(@RequestBody Product product) {

}

Path Variable
The @PathVariable annotation is used to define the custom or dynamic request URI. The
Path variable in request URI is defined as curly braces {} as shown below:

public ResponseEntity<Object> updateProduct(@PathVariable("id") String id) {

}

Request Parameter
The @RequestParam annotation is used to read the request parameters from the Request
URL. By default, it is a required parameter. We can also set default value for request
parameters as shown here:

public ResponseEntity<Object> getProduct(@RequestParam(value="name",

required=false, defaultValue="honey") String name) {
}

GET API
The default HTTP request method is GET. This method does not require any Request Body.
You can send request parameters and path variables to define the custom or dynamic URL.

The sample code to define the HTTP GET request method is shown below. In this example,
we used HashMap to store the Product. Note that we used a POJO class as the product to
be stored.

Here, the request URI is /products and it will return the list of products from HashMap
repository. The controller class file is given below that contains GET method REST
Endpoint.

44
Spring Boot

package com.tutorialspoint.demo.controller;

import java.util.HashMap;
import java.util.Map;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.tutorialspoint.demo.model.Product;

@RestController
public class ProductServiceController {

private static Map<String, Product> productRepo = new HashMap<>();

static {

Product honey = new Product();

honey.setId("1");
honey.setName("Honey");
productRepo.put(honey.getId(), honey);

Product almond = new Product();

almond.setId("2");
almond.setName("Almond");
productRepo.put(almond.getId(), almond);

@RequestMapping(value="/products")
public ResponseEntity<Object> getProduct() {
return new ResponseEntity<>(productRepo.values(), HttpStatus.OK);

45
Spring Boot

}
}

POST API
The HTTP POST request is used to create a resource. This method contains the Request
Body. We can send request parameters and path variables to define the custom or dynamic
URL.

The following example shows the sample code to define the HTTP POST request method.
In this example, we used HashMap to store the Product, where the product is a POJO class.

Here, the request URI is /products, and it will return the String after storing the product
into HashMap repository.

package com.tutorialspoint.demo.controller;

import java.util.HashMap;
import java.util.Map;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.tutorialspoint.demo.model.Product;

@RestController
public class ProductServiceController {
private static Map<String, Product> productRepo = new HashMap<>();

@RequestMapping(value="/products", method=RequestMethod.POST)
public ResponseEntity<Object> createProduct(@RequestBody Product product)
{
productRepo.put(product.getId(), product);
return new ResponseEntity<>("Product is created successfully",
HttpStatus.CREATED);
}
}

46
Spring Boot

PUT API
The HTTP PUT request is used to update the existing resource. This method contains a
Request Body. We can send request parameters and path variables to define the custom
or dynamic URL.

The example given below shows how to define the HTTP PUT request method. In this
example, we used HashMap to update the existing Product, where the product is a POJO
class.

Here the request URI is /products/{id}, which will return the String after a the product
into a HashMap repository. Note that we used the Path variable {id} which defines the
products ID that needs to be updated.

package com.tutorialspoint.demo.controller;

import java.util.HashMap;
import java.util.Map;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.tutorialspoint.demo.model.Product;

@RestController
public class ProductServiceController {

private static Map<String, Product> productRepo = new HashMap<>();

@RequestMapping(value="/products/{id}", method=RequestMethod.PUT)
public ResponseEntity<Object> updateProduct(@PathVariable("id") String id,
@RequestBody Product product) {
productRepo.remove(id);
product.setId(id);
productRepo.put(id, product);
return new ResponseEntity<>("Product is updated successsfully",
HttpStatus.OK);
}
}

47
Spring Boot

DELETE API
The HTTP Delete request is used to delete the existing resource. This method does not
contain any Request Body. We can send request parameters and path variables to define
the custom or dynamic URL.

The example given below shows how to define the HTTP DELETE request method. In this
example, we used HashMap to remove the existing product, which is a POJO class.

The request URI is /products/{id} and it will return the String after deleting the product
from HashMap repository. We used the Path variable {id} which defines the products ID
that needs to be deleted.

package com.tutorialspoint.demo.controller;

import java.util.HashMap;
import java.util.Map;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.tutorialspoint.demo.model.Product;

@RestController
public class ProductServiceController {

private static Map<String, Product> productRepo = new HashMap<>();

@RequestMapping(value="/products/{id}", method=RequestMethod.DELETE)
public ResponseEntity<Object> delete(@PathVariable("id") String id) {
productRepo.remove(id);
return new ResponseEntity<>("Product is deleted successsfully",
HttpStatus.OK);
}

48
Spring Boot

This section gives you the complete set of source code. Observe the following codes for
their respective functionalities:

The Spring Boot main application class – DemoApplication.java

The POJO class – Product.java

package com.tutorialspoint.demo.model;

public class Product {

private String id;
private String name;

public String getId() {

return id;
}

public void setId(String id) {

this.id = id;
}

public String getName() {

return name;
}

public void setName(String name) {

this.name = name;
}
}

The Rest Controller class – ProductServiceController.java

49
Spring Boot

package com.tutorialspoint.demo.controller;

import java.util.HashMap;
import java.util.Map;

import com.tutorialspoint.demo.model.Product;

@RestController
public class ProductServiceController {

private static Map<String, Product> productRepo = new HashMap<>();

static {

Product honey = new Product();

honey.setId("1");
honey.setName("Honey");
productRepo.put(honey.getId(), honey);

Product almond = new Product();

almond.setId("2");
almond.setName("Almond");
productRepo.put(almond.getId(), almond);

@RequestMapping(value="/products/{id}", method=RequestMethod.DELETE)
public ResponseEntity<Object> delete(@PathVariable("id") String id) {

50
Spring Boot

productRepo.remove(id);
return new ResponseEntity<>("Product is deleted successsfully",
HttpStatus.OK);
}

@RequestMapping(value="/products")
public ResponseEntity<Object> getProduct() {
return new ResponseEntity<>(productRepo.values(), HttpStatus.OK);
}
}

You can create an executable JAR file, and run the spring boot application by using the
below Maven or Gradle commands as shown:

For Maven, use the command shown below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

51
Spring Boot

For Gradle, use the command shown below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

You can run the JAR file by using the command shown below:

java –jar <JARFILE>

This will start the application on the Tomcat port 8080 as shown below:

Now hit the URL shown below in POSTMAN application and see the output.

GET API URL is: http://localhost:8080/products

POST API URL is: http://localhost:8080/products

52
Spring Boot

PUT API URL is: http://localhost:8080/products/3

DELETE API URL is: http://localhost:8080/products/3

53
12. Spring Boot – Exception Handling Spring Boot

Handling exceptions and errors in APIs and sending the proper response to the client is
good for enterprise applications. In this chapter, we will learn how to handle exceptions in
Spring Boot.

Before proceeding with exception handling, let us gain an understanding on the following
annotations.

Controller Advice
The @ControllerAdvice is an annotation, to handle the exceptions globally.

Exception Handler
The @ExceptionHandler is an annotation used to handle the specific exceptions and
sending the custom responses to the client.

You can use the following code to create @ControllerAdvice class to handle the exceptions
globally:

package com.tutorialspoint.demo.exception;

import org.springframework.web.bind.annotation.ControllerAdvice;

@ControllerAdvice
public class ProductExceptionController {

Define a class that extends the RuntimeException class.

package com.tutorialspoint.demo.exception;

public class ProductNotfoundException extends RuntimeException {

private static final long serialVersionUID = 1L;

54
Spring Boot

You can define the @ExceptionHandler method to handle the exceptions as shown. This
method should be used for writing the Controller Advice class file.

@ExceptionHandler(value = ProductNotfoundException.class)
public ResponseEntity<Object> exception(ProductNotfoundException exception) {
}

Now, use the code given below to throw the exception from the API.

@RequestMapping(value="/products/{id}", method=RequestMethod.PUT)
public ResponseEntity<Object> updateProduct() {
throw new ProductNotfoundException();
}

The complete code to handle the exception is given below. In this example, we used the
PUT API to update the product. Here, while updating the product, if the product is not
found, then return the response error message as “Product not found”. Note that the
ProductNotFoundException exception class should extend the RuntimeException.

package com.tutorialspoint.demo.exception;
public class ProductNotfoundException extends RuntimeException {
private static final long serialVersionUID = 1L;
}

The Controller Advice class to handle the exception globally is given below. We can define
any Exception Handler methods in this class file.

package com.tutorialspoint.demo.exception;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
@ControllerAdvice
public class ProductExceptionController {

@ExceptionHandler(value = ProductNotfoundException.class)
public ResponseEntity<Object> exception(ProductNotfoundException
exception) {
return new ResponseEntity<>("Product not found",
HttpStatus.NOT_FOUND);
}
}

55
Spring Boot

The Product Service API controller file is given below to update the Product. If the Product
is not found, then it throws the ProductNotFoundException class.

package com.tutorialspoint.demo.controller;

import java.util.HashMap;
import java.util.Map;

import com.tutorialspoint.demo.exception.ProductNotfoundException;
import com.tutorialspoint.demo.model.Product;

@RestController
public class ProductServiceController {

private static Map<String, Product> productRepo = new HashMap<>();

static {

Product honey = new Product();

honey.setId("1");
honey.setName("Honey");
productRepo.put(honey.getId(), honey);

Product almond = new Product();

almond.setId("2");
almond.setName("Almond");
productRepo.put(almond.getId(), almond);

56
Spring Boot

@RequestMapping(value="/products/{id}", method=RequestMethod.PUT)
public ResponseEntity<Object> updateProduct(@PathVariable("id") String id,
@RequestBody Product product) {
if(!productRepo.containsKey(id))
throw new ProductNotfoundException();
productRepo.remove(id);
product.setId(id);
productRepo.put(id, product);
return new ResponseEntity<>("Product is updated successfully",
HttpStatus.OK);
}
}

The code for main Spring Boot application class file is given below:

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

The code for POJO class for Product is given below:

package com.tutorialspoint.demo.model;
public class Product {
private String id;
private String name;

public String getId() {

return id;
}

57
Spring Boot

public void setId(String id) {

this.id = id;
}

public String getName() {

return name;
}

public void setName(String name) {

this.name = name;
}
}

The code for Maven build – pom.xml is shown below:

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>
</parent>

58
Spring Boot

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-
8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

The code for Gradle Build – build.gradle is given below:

59
Spring Boot

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the spring boot application by using the
following Maven or Gradle commands.

For Maven, you can use the following command:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the following command:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

You can run the JAR file by using the following command:

60
Spring Boot

java –jar <JARFILE>

This will start the application on the Tomcat port 8080 as shown below:

Now hit the below URL in POSTMAN application and you can see the output as shown
below:

Update URL: http://localhost:8080/products/3

61
13. Spring Boot – Interceptor Spring Boot

You can use the Interceptor in Spring Boot to perform operations under the following
situations:

 Before sending the request to the controller

 Before sending the response to the client

For example, you can use an interceptor to add the request header before sending the
request to the controller and add the response header before sending the response to the
client.

To work with interceptor, you need to create @Component class that supports it and it
should implement the HandlerInterceptor interface.

The following are the three methods you should know about while working on Interceptors:

 preHandle() method: This is used to perform operations before sending the

request to the controller. This method should return true to return the response to
the client.

 postHandle() method: This is used to perform operations before sending the

response to the client.

 afterCompletion() method: This is used to perform operations after completing

the request and response.

Observe the following code for a better understanding:

@Component
public class ProductServiceInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse
response, Object handler) throws Exception {
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse
response, Object handler, ModelAndView modelAndView) throws Exception {}
@Override
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception exception) throws
Exception {}
}

62
Spring Boot

You will have to register this Interceptor with InterceptorRegistry by using

WebMvcConfigurerAdapter as shown below:

@Component
public class ProductServiceInterceptorAppConfig extends WebMvcConfigurerAdapter
{

@Autowired
ProductServiceInterceptor productServiceInterceptor;

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(productServiceInterceptor);
}
}

In the example given below, we are going to hit the GET products API which gives the
output as given under:

The code for the Interceptor class ProductServiceInterceptor.java is given below:

package com.tutorialspoint.demo.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Component
public class ProductServiceInterceptor implements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse
response, Object handler) throws Exception {
System.out.println("Pre Handle method is Calling");
return true;
}

@Override

63
Spring Boot

public void postHandle(HttpServletRequest request, HttpServletResponse

response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("Post Handle method is Calling");
}

@Override
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception exception) throws
Exception {
System.out.println("Request and Response is completed");
}

The code for Application Configuration class file to register the Interceptor into Interceptor
Registry – ProductServiceInterceptorAppConfig.java is given below:

package com.tutorialspoint.demo.interceptor;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import
org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Component
public class ProductServiceInterceptorAppConfig extends WebMvcConfigurerAdapter
{

@Autowired
ProductServiceInterceptor productServiceInterceptor;

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(productServiceInterceptor);
}
}

64
Spring Boot

The code for Controller class file ProductServiceController.java is given below:

package com.tutorialspoint.demo.controller;
import java.util.HashMap;
import java.util.Map;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.tutorialspoint.demo.exception.ProductNotfoundException;
import com.tutorialspoint.demo.model.Product;
@RestController
public class ProductServiceController {
private static Map<String, Product> productRepo = new HashMap<>();
static {
Product honey = new Product();
honey.setId("1");
honey.setName("Honey");
productRepo.put(honey.getId(), honey);
Product almond = new Product();
almond.setId("2");
almond.setName("Almond");
productRepo.put(almond.getId(), almond);
}

@RequestMapping(value="/products")
public ResponseEntity<Object> getProduct() {
return new ResponseEntity<>(productRepo.values(), HttpStatus.OK);
}
}

65
Spring Boot

The code for POJO class for Product.java is given below:

package com.tutorialspoint.demo.model;

public class Product {

private String id;
private String name;

public String getId() {

return id;
}

public void setId(String id) {

this.id = id;
}

public String getName() {

return name;
}

public void setName(String name) {

this.name = name;
}
}

The code for main Spring Boot application class file DemoApplication.java is given
below:

The code for Maven build – pom.xml is shown here:

66
Spring Boot

<?xml version="1.0" encoding="UTF-8"?>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>

67
Spring Boot

</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

The code for Gradle Build build.gradle is shown here:

repositories {

68
Spring Boot

mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the Spring Boot application by using the
below Maven or Gradle commands.

For Maven, use the command as shown below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command as shown below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

You can run the JAR file by using the following command:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080 as shown below:

Now hit the below URL in POSTMAN application and you can see the output as shown
under:

GET API: http://localhost:8080/products

69
Spring Boot

In the console window, you can see the System.out.println statements added in the
Interceptor as shown in the screenshot given below:

70
14. Spring Boot – Servlet Filter Spring Boot

A filter is an object used to intercept the HTTP requests and responses of your application.
By using filter, we can perform two operations at two instances:

 Before sending the request to the controller

 Before sending a response to the client.
The following code shows the sample code for a Servlet Filter implementation class with
@Component annotation.

@Component
public class SimpleFilter implements Filter {

@Override
public void destroy() {}

@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterchain) throws IOException, ServletException {}

@Override
public void init(FilterConfig filterconfig) throws ServletException {}
}

The following example shows the code for reading the remote host and remote address
from the ServletRequest object before sending the request to the controller.

In doFilter() method, we have added the System.out.println statements to print the

remote host and remote address.

package com.tutorialspoint.demo;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

71
Spring Boot

import org.springframework.stereotype.Component;

@Component
public class SimpleFilter implements Filter {

@Override
public void destroy() {}

@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain filterchain) throws IOException, ServletException {
System.out.println("Remote Host:"+request.getRemoteHost());
System.out.println("Remote Address:"+request.getRemoteAddr());
filterchain.doFilter(request, response);
}

@Override
public void init(FilterConfig filterconfig) throws ServletException {}
}

In the Spring Boot main application class file, we have added the simple REST endpoint
that returns the “Hello World” string.

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

72
Spring Boot

@RequestMapping(value="/")
public String hello() {
return "Hello World";
}

The code for Maven build – pom.xml is given below:

<?xml version="1.0" encoding="UTF-8"?>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>
</parent>

73
Spring Boot

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

The code for Gradle Build – build.gradle is given below:

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

74
Spring Boot

apply plugin: 'eclipse'

apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the Spring Boot application by using the
Maven or Gradle commands shown below:

For Maven, use the command as shown below:

mvn clean install

After BUILD SUCCESS, you can find the JAR file under the target directory.

For Gradle, use the command as shown below:

gradle clean build

After BUILD SUCCESSFUL, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the following command

java –jar <JARFILE>

You can see the application has started on the Tomcat port 8080.

Now hit the URL http://localhost:8080/ and see the output Hello World. It should look
as shown below:

75
Spring Boot

Then, you can see the Remote host and Remote address on the console log as shown
below:

76
15. Spring Boot – Tomcat Port Number Spring Boot

Spring Boot lets you to run the same application more than once on a different port
number. In this chapter, you will learn about this in detail. Note that the default port
number 8080.

Custom Port
In the application.properties file, we can set custom port number for the property
server.port

server.port=9090

In the application.yml file, you can find as follows:

server:
port: 9090

Random Port
In the application.properties file, we can set random port number for the property
server.port

server.port=0

In the application.yml file, you can find as follows:

server:
port: 0

Note: If the server.port number is 0 while starting the Spring Boot application, Tomcat
uses the random port number.

77
16. Spring Boot – Rest Template Spring Boot

Rest Template is used to create applications that consume RESTful Web Services. You can
use the exchange() method to consume the web services for all HTTP methods. The code
given below shows how to create Bean for Rest Template to auto wiring the Rest Template
object.

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

@Bean
public RestTemplate getRestTemplate() {
return new RestTemplate();
}

78
Spring Boot

GET
Consuming the GET API by using RestTemplate - exchange() method

Assume this URL http://localhost:8080/products returns the following JSON and we are
going to consume this API response by using Rest Template using the following code:

[
{
"id": "1",
"name": "Honey"
},
{
"id": "2",
"name": "Almond"
}
]

You will have to follow the given points to consume the API:

 Autowired the Rest Template Object.

 Use HttpHeaders to set the Request Headers.
 Use HttpEntity to wrap the request object.
 Provide the URL, HttpMethod, and Return type for Exchange() method.

@RestController
public class ConsumeWebService {

@Autowired
RestTemplate restTemplate;

@RequestMapping(value = "/template/products")
public String getProductList() {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<String> entity = new HttpEntity<String>(headers);
return restTemplate.exchange("http://localhost:8080/products",
HttpMethod.GET, entity, String.class).getBody();
}
}

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Spring Boot

POST
Consuming POST API by using RestTemplate - exchange() method

Assume this URL http://localhost:8080/products returns the response shown below, we

are going to consume this API response by using the Rest Template.

The code given below is the Request body:

{
"id":"3",
"name":"Ginger"
}

The code given below is the Response body:

Product is created successfully

You will have to follow the points given below to consume the API:

 Autowired the Rest Template Object.

 Use the HttpHeaders to set the Request Headers.
 Use the HttpEntity to wrap the request object. Here, we wrap the Product object to
send it to the request body.
 Provide the URL, HttpMethod, and Return type for exchange() method.

@RestController
public class ConsumeWebService {

@Autowired
RestTemplate restTemplate;

@RequestMapping(value="/template/products", method=RequestMethod.POST)
public String createProducts(@RequestBody Product product) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<Product> entity = new
HttpEntity<Product>(product,headers);
return restTemplate.exchange("http://localhost:8080/products",
HttpMethod.POST, entity, String.class).getBody();
}
}

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Spring Boot

PUT
Consuming PUT API by using RestTemplate - exchange() method

Assume this URL http://localhost:8080/products/3 returns the below response and we

are going to consume this API response by using Rest Template.

The code given below is Request body:

{
"name":"Indian Ginger"
}

The code given below is the Response body:

Product is updated successsfully

You will have to follow the points given below to consume the API:

 Autowired the Rest Template Object.

 Use HttpHeaders to set the Request Headers.
 Use HttpEntity to wrap the request object. Here, we wrap the Product object to
send it to the request body.
 Provide the URL, HttpMethod, and Return type for exchange() method.

@RestController
public class ConsumeWebService {

@Autowired
RestTemplate restTemplate;

@RequestMapping(value="/template/products/{id}", method=RequestMethod.PUT)
public String updateProduct(@PathVariable("id") String id, @RequestBody
Product product) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<Product> entity = new
HttpEntity<Product>(product,headers);
return restTemplate.exchange("http://localhost:8080/products/"+id,
HttpMethod.PUT, entity, String.class).getBody();
}
}

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Spring Boot

DELETE
Consuming DELETE API by using RestTemplate - exchange() method

Assume this URL http://localhost:8080/products/3 returns the response given below and
we are going to consume this API response by using Rest Template.

This line of code shown below is the Response body:

Product is deleted successsfully

You will have to follow the points shown below to consume the API:

 Autowired the Rest Template Object.

 Use HttpHeaders to set the Request Headers.
 Use HttpEntity to wrap the request object.
Provide the URL, HttpMethod, and Return type for exchange() method.

@RestController
public class ConsumeWebService {

@Autowired
RestTemplate restTemplate;

@RequestMapping(value="/template/products/{id}",
method=RequestMethod.DELETE)
public String deleteProduct(@PathVariable("id") String id) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<Product> entity = new HttpEntity<Product>(headers);
return restTemplate.exchange("http://localhost:8080/products/"+id,
HttpMethod.DELETE, entity, String.class).getBody();
}
}

The complete Rest Template Controller class file is given below:

package com.tutorialspoint.demo.controller;

import java.util.Arrays;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;

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Spring Boot

import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import com.tutorialspoint.demo.model.Product;

@RestController
public class ConsumeWebService {

@Autowired
RestTemplate restTemplate;

@RequestMapping(value="/template/products/{id}", method=RequestMethod.PUT)

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Spring Boot

public String updateProduct(@PathVariable("id") String id, @RequestBody

Product product) {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
HttpEntity<Product> entity = new
HttpEntity<Product>(product,headers);
return restTemplate.exchange("http://localhost:8080/products/"+id,
HttpMethod.PUT, entity, String.class).getBody();
}

The code for Spring Boot Application Class – DemoApplication.java is given below:

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

The code for Maven build – pom.xml is given below:

<?xml version="1.0" encoding="UTF-8"?>

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Spring Boot

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

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Spring Boot

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

The code for Gradle Build – build.gradle is given below:

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

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Spring Boot

repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands:

For Maven, you can use the command given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command shown below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under build/libs directory.

Now, run the JAR file by using the following command:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080.

Now hit the below URL’s in POSTMAN application and you can see the output.

GET Products by Rest Template - http://localhost:8080/template/products

87
Spring Boot

Create Products POST - http://localhost:8080/template/products

Update Product PUT - http://localhost:8080/template/products/3

Delete Product - http://localhost:8080/template/products/3

88
17. Spring Boot – File Handling Spring Boot

In this chapter, you will learn how to upload and download the file by using web service.

File Upload
For uploading a file, you can use MultipartFile as a Request Parameter and this API should
consume Multi-Part form data value. Observe the code given below:

@RequestMapping(value="/upload", method=RequestMethod.POST, consumes =

MediaType.MULTIPART_FORM_DATA_VALUE)
public String fileUpload(@RequestParam("file") MultipartFile file) {
return null;
}

The complete code for the same is given below:

package com.tutorialspoint.demo.controller;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

@RestController
public class FileUploadController {

@RequestMapping(value="/upload", method=RequestMethod.POST, consumes =

MediaType.MULTIPART_FORM_DATA_VALUE)
public String fileUpload(@RequestParam("file") MultipartFile file) throws
IOException {

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Spring Boot

File convertFile = new

File("/var/tmp/"+file.getOriginalFilename());

convertFile.createNewFile();
FileOutputStream fout = new FileOutputStream(convertFile);
fout.write(file.getBytes());
fout.close();
return "File is upload successfully";
}
}

File Download
For file download, you should use InputStreamResource for downloading a File. We need
to set the HttpHeader Content-Disposition in Response and need to specify the response
Media Type of the application.

Note: In the following example, file should be available on the specified path where the
application is running.

@RequestMapping(value="/download", method=RequestMethod.GET)
public ResponseEntity<Object> downloadFile() throws IOException {
String filename = "/var/tmp/mysql.png";
File file = new File(filename);
InputStreamResource resource = new InputStreamResource(new
FileInputStream(file));
HttpHeaders headers = new HttpHeaders();
headers.add("Content-Disposition", String.format("attachment;
filename=\"%s\"", file.getName()));
headers.add("Cache-Control", "no-cache, no-store, must-
revalidate");
headers.add("Pragma", "no-cache");
headers.add("Expires", "0");

ResponseEntity<Object> responseEntity =
ResponseEntity.ok().headers(headers).contentLength(file.length()).contentType(M
ediaType.parseMediaType("application/txt")).body(resource);
return responseEntity;
}

90
Spring Boot

The complete code for the same is given below:

package com.tutorialspoint.demo.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.springframework.core.io.InputStreamResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class FileDownloadController {

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Spring Boot

The main Spring Boot application is given below

The code for Maven build – pom.xml is given below:

<?xml version="1.0" encoding="UTF-8"?>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>
</parent>

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Spring Boot

</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

The code for Gradle Build – build.gradle is given below:

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {

93
Spring Boot

classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

Now you can create an executable JAR file, and run the Spring Boot application by using
the Maven or Gradle commands given below:

For Maven, use the command given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under target directory.

For Gradle, you ca use the command shown below:

sgradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under build/libs directory.

Now, run the JAR file by using the following command:

java –jar <JARFILE>

This will start the application on the Tomcat port 8080 as shown below:

94
Spring Boot

Now hit the below URL’s in POSTMAN application and you can see the output as shown
below:

File upload - http://localhost:8080/upload

File download - http://localhost:8080/upload

95
18. Spring Boot – Service Components Spring Boot

Service Components are the class file which contains @Service annotation. These class
files are used to write business logic in a different layer, separated from @RestController
class file. The logic for creating a service component class file is shown here:

public interface ProductService {

}

The class that implements the Interface with @Service annotation is as shown:

@Service
public class ProductServiceImpl implements ProductService {
}

Observe that in this tutorial, we are using Product Service API(s) to store, retrieve,
update and delete the products. We wrote the business logic in @RestController class file
itself. Now, we are going to move the business logic code from controller to service
component.

You can create an Interface which contains add, edit, get and delete methods using the
code as shown below:

package com.tutorialspoint.demo.service;

import java.util.Collection;

import com.tutorialspoint.demo.model.Product;

public interface ProductService {

public abstract void createProduct(Product product);

public abstract void updateProduct(String id, Product product);

public abstract void deleteProduct(String id);

public abstract Collection<Product> getProducts();

}

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Spring Boot

The following code will let you to create a class which implements the ProductService
interface with @Service annotation and write the business logic to store, retrieve, delete
and updates the product.

package com.tutorialspoint.demo.service;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Service;
import com.tutorialspoint.demo.model.Product;
@Service
public class ProductServiceImpl implements ProductService {
private static Map<String, Product> productRepo = new HashMap<>();

static {

Product honey = new Product();

honey.setId("1");
honey.setName("Honey");
productRepo.put(honey.getId(), honey);

Product almond = new Product();

almond.setId("2");
almond.setName("Almond");
productRepo.put(almond.getId(), almond);

@Override
public void createProduct(Product product) {
productRepo.put(product.getId(), product);
}

@Override
public void updateProduct(String id, Product product) {
productRepo.remove(id);
product.setId(id);
productRepo.put(id, product);

97
Spring Boot

@Override
public void deleteProduct(String id) {
productRepo.remove(id);

@Override
public Collection<Product> getProducts() {
return productRepo.values();
}

The code here show the Rest Controller class file, here we @Autowired the ProductService
interface and called the methods.

package com.tutorialspoint.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.tutorialspoint.demo.model.Product;
import com.tutorialspoint.demo.service.ProductService;

@RestController
public class ProductServiceController {

@Autowired
ProductService productService;

98
Spring Boot

@RequestMapping(value = "/products")
public ResponseEntity<Object> getProduct() {
return new ResponseEntity<>(productService.getProducts(),
HttpStatus.OK);
}

@RequestMapping(value = "/products/{id}", method = RequestMethod.PUT)

public ResponseEntity<Object> updateProduct(@PathVariable("id") String id,
@RequestBody Product product) {
productService.updateProduct(id, product);
return new ResponseEntity<>("Product is updated successsfully",
HttpStatus.OK);
}

@RequestMapping(value = "/products/{id}", method = RequestMethod.DELETE)

public ResponseEntity<Object> delete(@PathVariable("id") String id) {
productService.deleteProduct(id);
return new ResponseEntity<>("Product is deleted successsfully",
HttpStatus.OK);
}

@RequestMapping(value = "/products", method = RequestMethod.POST)

public ResponseEntity<Object> createProduct(@RequestBody Product product)
{
productService.createProduct(product);
return new ResponseEntity<>("Product is created successfully",
HttpStatus.CREATED);
}

The code for POJO class – Product.java is shown here:

package com.tutorialspoint.demo.model;

public class Product {

private String id;
private String name;

public String getId() {

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Spring Boot

return id;
}

public void setId(String id) {

this.id = id;
}

public String getName() {

return name;
}

public void setName(String name) {

this.name = name;
}
}

A main Spring Boot application is given below

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

The code for Maven build – pom.xml is shown below:

<?xml version="1.0" encoding="UTF-8"?>

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Spring Boot

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/>
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

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Spring Boot

<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

The code for Gradle Build – build.gradle is shown below:

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')

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Spring Boot

testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the Spring Boot application by using the
Maven or Gradle commands given below:

For Maven, use the command as shown below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command as shown below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under build/libs directory.

Run the JAR file by using the command given below:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080 as shown in the image given
below:

Now hit the below URL’s in POSTMAN application and you can see the output as shown
below:

GET API URL is: http://localhost:8080/products

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Spring Boot

POST API URL is: http://localhost:8080/products

PUT API URL is: http://localhost:8080/products/3

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Spring Boot

DELETE API URL is: http://localhost:8080/products/3

105
19. Spring Boot – Thymeleaf Spring Boot

Thymeleaf is a Java-based library used to create a web application. It provides a good

support for serving a XHTML/HTML5 in web applications. In this chapter, you will learn in
detail about Thymeleaf.

Thymeleaf Templates
Thymeleaf converts your files into well-formed XML files. It contains 6 types of templates
as given below:

 XML
 Valid XML
 XHTML
 Valid XHTML
 HTML5
 Legacy HTML5

All templates, except Legacy HTML5, are referring to well-formed valid XML files. Legacy
HTML5 allows us to render the HTML5 tags in web page including not closed tags.

Web Application
You can use Thymeleaf templates to create a web application in Spring Boot. You will have
to follow the below steps to create a web application in Spring Boot by using Thymeleaf.

Use the following code to create a @Controller class file to redirect the Request URI to
HTML file:

package com.tutorialspoint.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class WebController {

@RequestMapping(value = "/index")
public String index() {
return "index";
}
}

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Spring Boot

In the above example, the request URI is /index, and the control is redirected into the
index.html file. Note that the index.html file should be placed under the templates
directory and all JS and CSS files should be placed under the static directory in classpath.
In the example shown, we used CSS file to change the color of the text.

You can use the following code and created a CSS file in separate folder css and name the
file as styles.css:

h4 {
color: red;
}

The code for index.html file is given below:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1" />
<link href="css/styles.css" rel="stylesheet"/>
<title>Spring Boot Application</title>
</head>
<body>
<h4>Welcome to Thymeleaf Spring Boot web application</h4>
</body>
</html>

107
Spring Boot

The project explorer is shown in the screenshot given below:

Now, we need to add the Spring Boot Starter Thymeleaf dependency in our build
configuration file.

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Spring Boot

Maven users can add the following dependency into the pom.xml file:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

Gradle users can add the following dependency in the build.gradle file:

compile group: 'org.springframework.boot', name: 'spring-boot-starter-

thymeleaf'

The code for main Spring Boot application class file is given below:

package com.tutorialspoint.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

The code for Maven – pom.xml is given below:

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>

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Spring Boot

<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath />
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

</dependencies>

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Spring Boot

<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

The code for Gradle – build.gradle is given below:

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

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Spring Boot

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
compile group: 'org.springframework.boot', name: 'spring-boot-starter-
thymeleaf'
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the spring boot application by using the
following Maven or Gradle commands:

For Maven, use the command as shown below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command as shown below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Run the JAR file by using the command given here:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080 as shown below:

Now hit the URL in your web browser and you can see the output as shown:

http://localhost:8080/index

112
20. Spring Boot – Consuming RESTful Web Spring Boot

Services

This chapter will discuss in detail about consuming a RESTful Web Services by using jQuery
AJAX.

Create a simple Spring Boot web application and write a controller class files which is used
to redirects into the HTML file to consumes the RESTful web services.

We need to add the Spring Boot starter Thymeleaf and Web dependency in our build
configuration file.

For Maven users, add the below dependencies in your pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

For Gradle users, add the below dependencies into your build.gradle file:

compile group: ‘org.springframework.boot’, name: ‘spring-boot-starter-

thymeleaf’
compile(‘org.springframework.boot:spring-boot-starter-web’)

The code for @Controller class file is given below:

@Controller
public class ViewController {
}

You can define the Request URI methods to redirects into the HTML file as shown below:

@RequestMapping(“/view-products”)
public String viewProducts() {
return “view-products”;}
@RequestMapping(“/add-products”)
public String addProducts() {
return “add-products”;}

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Spring Boot

This API http://localhost:9090/products should return the below JSON in response as

shown below:

[
{
"id": "1",
"name": "Honey"
},
{
"id": "2",
"name": "Almond"
}
]

Now, create a view-products.html file under the templates directory in the classpath.

In the HTML file, we added the jQuery library and written the code to consume the RESTful
web service on page load.

The POST method and this URL http://localhost:9090/products should contains the below
Request Body and Response body.

The code for Request body is given below:

{
"id":"3",
"name":"Ginger"
}

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Spring Boot

The code for Response body is given below:

Product is created successfully

Now, create the add-products.html file under the templates directory in the classpath.

In the HTML file, we added the jQuery library and written the code that submits the form
to RESTful web service on clicking the button

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Spring Boot

The complete code is given below.

Maven – pom.xml file

<?xml version=”1.0” encoding=”UTF-8”?>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath />
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

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Spring Boot

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

The code for Gradle – build.gradle is given below:

buildscript {
ext {
springBootVersion = ‘1.5.8.RELEASE’
}
repositories {
mavenCentral()
}
dependencies {
classpath(“org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}”)
}

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Spring Boot

apply plugin: ‘java’

apply plugin: ‘eclipse’
apply plugin: ‘org.springframework.boot’

group = ‘com.tutorialspoint’
version = ‘0.0.1-SNAPSHOT’
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile(‘org.springframework.boot:spring-boot-starter-web’)
compile group: ‘org.springframework.boot’, name: ‘spring-boot-starter-
thymeleaf’
testCompile(‘org.springframework.boot:spring-boot-starter-test’)
}

The controller class file given below – ViewController.java is given below:

package com.tutorialspoint.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class ViewController {
@RequestMapping(“/view-products”)
public String viewProducts() {
return “view-products”;
}
@RequestMapping(“/add-products”)
public String addProducts() {
return “add-products”; }
}

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Spring Boot

The view-products.html file is given below:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1"/>
<title>View Products</title>
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script
>
<script>
$(document).ready(function(){
$.getJSON("http://localhost:9090/products", function(result){
$.each(result, function(key,value) {
$("#productsJson").append(value.id+" "+value.name+" ");
});
});
});
</script>
</head>
<body>
<div id="productsJson">
</div>
</body>
</html>

The add-products.html file is given below:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1" />
<title>Add Products</title>
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></s
cript>
<script>
$(document).ready(function() {
$("button").click(function() {

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Spring Boot

The main Spring Boot Application class file is given below:

package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}

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Spring Boot

Now, you can create an executable JAR file, and run the Spring Boot application by using
the following Maven or Gradle commands.

For Maven, use the command as given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command as given below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Run the JAR file by using the following command:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080.

Now hit the URL in your web browser and you can see the output as shown:

http://localhost:8080/view-products

http://localhost:8080/add-products

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Spring Boot

Now, click the button Click here to submit the form and you can see the result as
shown:

Now, hit the view products URL and see the created product.

http://localhost:8080/view-products

Angular JS
To consume the APIs by using Angular JS, you can use the examples given below:

Use the following code to create the Angular JS Controller to consume the GET API -
http://localhost:9090/products :

angular.module('demo', [])
.controller('Hello', function($scope, $http) {
$http.get('http://localhost:9090/products').
then(function(response) {
$scope.products = response.data;
});
});

Use the following code to create the Angular JS Controller to consume the POST API -
http://localhost:9090/products :

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Spring Boot

angular.module('demo', [])
.controller('Hello', function($scope, $http) {
$http.post('http://localhost:9090/products',data).
then(function(response) {
console.log("Product created successfully");
});
});

Note: The Post method data represents the Request body in JSON format to create a
product.

123
21. Spring Boot – CORS Support Spring Boot

Cross-Origin Resource Sharing (CORS) is a security concept that allows restricting the
resources implemented in web browsers. It prevents the JavaScript code producing or
consuming the requests against different origin.

For example, your web application is running on 8080 port and by using JavaScript you
are trying to consuming RESTful web services from 9090 port. Under such situations, you
will face the Cross-Origin Resource Sharing security issue on your web browsers.

Two requirements are needed to handle this issue:

 RESTful web services should support the Cross-Origin Resource Sharing.

 RESTful web service application should allow accessing the API(s) from the 8080
port.

In this chapter, we are going to learn in detail about How to Enable Cross-Origin Requests
for a RESTful Web Service application.

Enable CORS in Controller Method

We need to set the origins for RESTful web service by using @CrossOrigin annotation for
the controller method. This @CrossOrigin annotation supports specific REST API, and not
for the entire application.

@RequestMapping(value = "/products")
@CrossOrigin(origins = "http://localhost:8080")
public ResponseEntity<Object> getProduct() {
return null;
}

Global CORS Configuration

We need to define the shown @Bean configuration to set the CORS configuration support
globally to your Spring Boot application.

@Bean
public WebMvcConfigurer corsConfigurer() {
return new WebMvcConfigurerAdapter() {
@Override
public void addCorsMappings(CorsRegistry registry) {
registry.addMapping("/products").allowedOrigins("http://localhost:9000");

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Spring Boot

} };}

To code to set the CORS configuration globally in main Spring Boot application is given
below.

package com.tutorialspoint.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import
org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@SpringBootApplication
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}

@Bean
public WebMvcConfigurer corsConfigurer() {
return new WebMvcConfigurerAdapter() {
@Override
public void addCorsMappings(CorsRegistry registry) {

registry.addMapping("/products").allowedOrigins("http://localhost:8080");
}
};
}
}

Now, you can create a Spring Boot web application that runs on 8080 port and your
RESTful web service application that can run on the 9090 port. For further details about
implementation about RESTful Web Service, you can refer to the chapter titled
Consuming RESTful Web Services of this tutorial.

125
22. Spring Boot – Internationalization Spring Boot

Internationalization is a process that makes your application adaptable to different

languages and regions without engineering changes on the source code. In ither words,
Internationalization is a readiness of Localization.

In this chapter, we are going to learn in detail about How to implement the
Internationalization in Spring Boot.

Dependencies
We need the Spring Boot Starter Web and Spring Boot Starter Thymeleaf dependency to
develop a web application in Spring Boot.

Maven

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

Gradle

compile('org.springframework.boot:spring-boot-starter-web')
compile group: 'org.springframework.boot', name: 'spring-boot-starter-
thymeleaf'

LocaleResolver
We need to determine default Locale of your application. We need to add the
LocaleResolver bean in our Spring Boot application.

@Bean
public LocaleResolver localeResolver() {
SessionLocaleResolver sessionLocaleResolver = new SessionLocaleResolver();
sessionLocaleResolver.setDefaultLocale(Locale.US);
return sessionLocaleResolver;}

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Spring Boot

LocaleChangeInterceptor
LocaleChangeInterceptor is a used to change the new Locale based on the value of the
language parameter added to a request.

@Bean
public LocaleChangeInterceptor localeChangeInterceptor() {
LocaleChangeInterceptor localeChangeInterceptor = new
LocaleChangeInterceptor();
localeChangeInterceptor.setParamName("language");
return localeChangeInterceptor;
}

To take this effect, we need to add the LocaleChangeInterceptor into the application’s
registry interceptor. The configuration class should extend the WebMvcConfigurerAdapter
class and override the addInterceptors() method.

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(localeChangeInterceptor());
}

Messages Sources
Spring Boot application by default takes the message sources from src/main/resources
folder under the classpath. The default locale message file name should be
message.properties and files for each locale should name as
messages_XX.properties. The “XX” represents the locale code.

All the message properties should be used as key pair values. If any properties are not
found on the locale, the application uses the default property from messages.properties
file.

The default messages.properties will be as shown:

welcome.text=Hi Welcome to Everyone

The French language messages_fr.properties will be as shown:

welcome.text=Salut Bienvenue à tous

Note: Messages source file should be saved as “UTF-8” file format.

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Spring Boot

HTML file
In the HTML file, use the syntax #{key} to display the messages from the properties file.

The complete code is given below

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath />
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>

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Spring Boot

<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {

129
Spring Boot

classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
compile group: 'org.springframework.boot', name: 'spring-boot-starter-
thymeleaf'
testCompile('org.springframework.boot:spring-boot-starter-test')
}

The main Spring Boot application class file is given below

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Spring Boot

The controller class file is given below:

package com.tutorialspoint.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class ViewController {
@RequestMapping("/locale")
public String locale() {
return "locale";
}
}

Configuration class to support the Internationalization

package com.tutorialspoint.demo;

import java.util.Locale;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import
org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;

@Configuration
public class Internationalization extends WebMvcConfigurerAdapter {

@Bean
public LocaleResolver localeResolver() {
SessionLocaleResolver sessionLocaleResolver = new
SessionLocaleResolver();
sessionLocaleResolver.setDefaultLocale(Locale.US);
return sessionLocaleResolver;
}

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Spring Boot

@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(localeChangeInterceptor());
}
}

The Message sources – messages.properties is as shown:

welcome.text=Hi Welcome to Everyone

The Message sources – message_fr.properties is as shown:

welcome.text=Salut Bienvenue à tous

The HTML file locale.html should be placed under the templates directory on the classpath
as shown:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1"/>
<title>Internationalization</title>
</head>
<body>
<h1 th:text="#{welcome.text}"></h1>
</body>
</html>

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Spring Boot

You can create an executable JAR file, and run the Spring boot application by using the
following Maven or Gradle commands:

For Maven, use the following command:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the following command:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command as shown:

java –jar <JARFILE>

You will find that the application has started on the Tomcat port 8080.

Now hit the URL http://localhost:8080/locale in your web browser and you can see the
following output:

The URL http://localhost:8080/locale?language=fr will give you the output as shown:

133
23. Spring Boot – Scheduling Spring Boot

Scheduling is a process of executing the tasks for the specific time period. Spring Boot
provides a good support to write a scheduler on the Spring applications.

Java Cron Expression

Java Cron expressions are used to configure the instances of CronTrigger, a subclass of
org.quartz.Trigger. For more information about Java cron expression you can refer to this
link:
https://docs.oracle.com/cd/E12058_01/doc/doc.1014/e12030/cron_expressions.htm

The @EnableScheduling annotation is used to enable the scheduler for your application.
This annotation should be added into the main Spring Boot application class file.

@SpringBootApplication
@EnableScheduling
public class DemoApplication {

public static void main(String[] args) {

SpringApplication.run(DemoApplication.class, args);
}
}

The @Scheduled annotation is used to trigger the scheduler for a specific time period.

@Scheduled(cron = "0 * 9 * * ?")

public void cronJobSch() throws Exception {
}

The following is a sample code that shows how to execute the task every minute starting
at 9:00 AM and ending at 9:59 AM, every day

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Spring Boot

public class Scheduler {

@Scheduled(cron = "0 * 9 * * ?")
public void cronJobSch() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd
HH:mm:ss.SSS");
Date now = new Date();
String strDate = sdf.format(now);
System.out.println("Java cron job expression:: " + strDate);
}
}

The following screenshot shows how the application has started at 09:03:23 and for every
one minute from that time the cron job scheduler task has executed.

Fixed Rate
Fixed Rate scheduler is used to execute the tasks at the specific time. It does not wait for
the completion of previous task. The values should be in milliseconds. The sample code is
shown here:

@Scheduled(fixedRate = 1000)
public void fixedRateSch() {
}

A sample code for executing a task on every second from the application startup is shown
here:

package com.tutorialspoint.demo.scheduler;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component
public class Scheduler {
@Scheduled(fixedRate = 1000)
public void fixedRateSch() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd
HH:mm:ss.SSS");

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Spring Boot

Date now = new Date();

String strDate = sdf.format(now);
System.out.println("Fixed Rate scheduler:: " + strDate);
}
}

Observe the following screenshot that shows the application that has started at 09:12:00
and after that every second fixed rate scheduler task has executed.

Fixed Delay
Fixed Delay scheduler is used to execute the tasks at a specific time. It should wait for the
previous task completion. The values should be in milliseconds. A sample code is shown
here:

@Scheduled(fixedDelay = 1000, initialDelay = 1000)

public void fixedDelaySch() {
}

Here, the initialDelay is the time after which the task will be executed the first time after
the initial delay value.

An example to execute the task for every second after 3 seconds from the application
startup has been completed is shown below:

package com.tutorialspoint.demo.scheduler;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class Scheduler {

@Scheduled(fixedDelay = 1000, initialDelay = 3000)

public void fixedDelaySch() {

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Spring Boot

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd

HH:mm:ss.SSS");
Date now = new Date();
String strDate = sdf.format(now);
System.out.println("Fixed Delay scheduler:: " + strDate);
}
}

Observe the following screenshot which shows the application that has started at 09:18:39
and after every 3 seconds, the fixed delay scheduler task has executed on every second.

137
24. Spring Boot – Enabling HTTPS Spring Boot

By default, Spring Boot application uses HTTP 8080 port when the application starts up.

You need to follow the steps given below to configure the HTTPS and the port 443 in Spring
Boot application:

 Obtain the SSL certificate – Create a self-signed certificate or get one from a Certificate
Authority
 Enable HTTPS and 443 port

Self-Signed Certificate
To create a self-signed certificate, Java Run Time environment comes bundled with
certificate management utility key tool. This utility tool is used to create a Self-Signed
certificate. It is shown in the code given here:

keytool -genkey -alias tomcat -storetype PKCS12 -keyalg RSA -keysize 2048 -
keystore keystore.p12 -validity 3650
Enter keystore password:
Re-enter new password:
What is your first and last name?
[Unknown]:
What is the name of your organizational unit?
[Unknown]:
What is the name of your organization?
[Unknown]:
What is the name of your City or Locality?
[Unknown]:
What is the name of your State or Province?
[Unknown]:
What is the two-letter country code for this unit?
[Unknown]:
Is CN=Unknown, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown
correct?
[no]: yes

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Spring Boot

This code will generate a PKCS12 keystore file named as keystore.p12 and the certificate
alias name is tomcat.

Configure HTTPS
We need to provide the server port as 443, key-store file path, key-store-password, key-
store-type and key alias name into the application.properties file. Observe the code given
here:

server.port: 443
server.ssl.key-store: keystore.p12
server.ssl.key-store-password: springboot
server.ssl.keyStoreType: PKCS12
server.ssl.keyAlias: tomcat

You can use the following code if you are using YAML properties use below application.yml:

server:
port: 443
ssl:
key-store: keystore.p12
key-store-password: springboot
keyStoreType: PKCS12
keyAlias: tomcat

You can create an executable JAR file, and run the spring boot application by using the
following Maven or Gradle commands.

For Maven, you can use the following command:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the following command:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 443 with https as shown:

139
25. Spring Boot – Eureka Server Spring Boot

Eureka Server is an application that holds the information about all client-service
applications. Every Micro service will register into the Eureka server and Eureka server
knows all the client applications running on each port and IP address. Eureka Server is
also known as Discovery Server.

In this chapter, we will learn in detail about How to build a Eureka server.

Building a Eureka Server

Eureka Server comes with the bundle of Spring Cloud. For this, we need to develop the
Eureka server and run it on the default port 8761.

Visit the Spring Initializer homepage http://start.spring.io/ and download the Spring Boot
project with Eureka server dependency. It is shown in the screenshot below:

After downloading the project in main Spring Boot Application class file, we need to add
@EnableEurekaServer annotation. The @EnableEurekaServer annotation is used to make
your Spring Boot application acts as a Eureka Server.

The code for main Spring Boot application class file is as shown below:

package com.tutorialspoint.eurekaserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

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Spring Boot

@SpringBootApplication
@EnableEurekaServer
public class EurekaserverApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaserverApplication.class, args);
}
}

Make sure Spring cloud Eureka server dependency is added in your build configuration file.

The code for Maven user dependency is shown below:

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>

The code for Gradle user dependency is given below:

compile('org.springframework.cloud:spring-cloud-starter-eureka-server')

The complete build configuration file is given below:

Maven pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>eurekaserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>eurekaserver</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>

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Spring Boot

<version>1.5.9.RELEASE</version>
<relativePath/> 
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>

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Spring Boot

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()

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Spring Boot

ext {
springCloudVersion = 'Edgware.RELEASE'
}

dependencies {
compile('org.springframework.cloud:spring-cloud-starter-eureka-server')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-
dependencies:${springCloudVersion}"
}
}

By default, the Eureka Server registers itself into the discovery. You should add the below
given configuration into your application.properties file or application.yml file.

The application.properties file is given below:

eureka.client.registerWithEureka=false
eureka.client.fetchRegistry=false
server.port=8761

The application.yml file is given below:

eureka:
client:
registerWithEureka: false
fetchRegistry: false
server:
port: 8761

Now, you can create an executable JAR file, and run the Spring Boot application by using
the Maven or Gradle commands shown below:

For Maven, use the command as shown below:

mvn clean install

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Spring Boot

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command shown below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the following command:

java –jar <JARFILE>

You can find that the application has started on the Tomcat port 8761 as shown below:

Now, hit the URL http://localhost:8761/ in your web browser and you can find the Eureka
Server running on the port 8761 as shown below:

145
26. Spring Boot – Service Registration with Spring Boot

Eureka

In this chapter, you are going to learn in detail about How to register the Spring Boot Micro
service application into the Eureka Server. Before registering the application, please make
sure Eureka Server is running on the port 8761 or first build the Eureka Server and run it.
For further information on building the Eureka server, you can refer to the previous
chapter.

First, you need to add the following dependencies in our build configuration file to register
the microservice with the Eureka server.

Maven users can add the following dependencies into the pom.xml file:

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>

Gradle users can add the following dependencies into the build.gradle file:

compile('org.springframework.cloud:spring-cloud-starter-eureka')

Now, we need to add the @EnableEurekaClient annotation in the main Spring Boot
application class file. The @EnableEurekaClient annotation makes your Spring Boot
application act as a Eureka client.

The main Spring Boot application is as given below:

package com.tutorialspoint.eurekaclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class EurekaclientApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaclientApplication.class, args);
}
}

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Spring Boot

To register the Spring Boot application into Eureka Server we need to add the following
configuration in our application.properties file or application.yml file and specify the Eureka
Server URL in our configuration.

The code for application.yml file is given below:

eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka
instance:
preferIpAddress: true
spring:
application:
name: eurekaclient

The code for application.properties file is given below:

eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka
eureka.client.instance.preferIpAddress=true
spring.application.name=eurekaclient

Now, add the Rest Endpoint to return String in the main Spring Boot application and the
Spring Boot Starter web dependency in build configuration file. Observe the code given
below:

package com.tutorialspoint.eurekaclient;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@EnableEurekaClient
@RestController
public class EurekaclientApplication {

public static void main(String[] args) {

SpringApplication.run(EurekaclientApplication.class, args);
}

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Spring Boot

@RequestMapping(value = "/")
public String home() {
return "Eureka Client application";
}

The entire configuration file is given below.

For Maven user - pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>eurekaclient</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>eurekaclient</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> 
</parent>

148
Spring Boot

</properties>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins> </build>
</project>

149
Spring Boot

For Gradle user – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

ext {
springCloudVersion = 'Edgware.RELEASE'
}

dependencies {
compile('org.springframework.cloud:spring-cloud-starter-eureka')
testCompile('org.springframework.boot:spring-boot-starter-test')
compile('org.springframework.boot:spring-boot-starter-web')
}
dependencyManagement {

150
Spring Boot

imports {
mavenBom "org.springframework.cloud:spring-cloud-
dependencies:${springCloudVersion}"
}
}

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands:

For Maven, you can use the following command:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the following command:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command as shown:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080 and Eureka Client application is
registered with the Eureka Server as shown below:

Hit the URL http://localhost:8761/ in your web browser and you can see the Eureka Client
application is registered with Eureka Server.

Now hit the URL http://localhost:8080/ in your web browser and see the Rest Endpoint
output.

151
Spring Boot

152
27. Spring Boot – Zuul Proxy Server and Routing Spring Boot

Zuul Server is a gateway application that handles all the requests and does the dynamic
routing of microservice applications. The Zuul Server is also known as Edge Server.

For Example, /api/user is mapped to the user service and /api/products is mapped to
the product service and Zuul Server dynamically routes the requests to the respective
backend application.

In this chapter, we are going to see in detail how to create Zuul Server application in
Spring Boot.

Creating Zuul Server Application

The Zuul Server is bundled with Spring Cloud dependency. You can download the Spring
Boot project from Spring Initializer page http://start.spring.io/ and choose the Zuul Server
dependency.

Add the @EnableZuulProxy annotation on your main Spring Boot application. The
@EnableZuulProxy annotation is used to make your Spring Boot application act as a Zuul
Proxy server.

package com.tutorialspoint.zuulserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication

153
Spring Boot

@EnableZuulProxy
public class ZuulserverApplication {

public static void main(String[] args) {

SpringApplication.run(ZuulserverApplication.class, args);
}
}

You will have to add the Spring Cloud Starter Zuul dependency in our build configuration
file.

Maven users will have to add the following dependency in your pom.xml file:

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zuul</artifactId>
</dependency>

For Gradle users, add the below dependency in your build.gradle file

compile('org.springframework.cloud:spring-cloud-starter-zuul')

For Zuul routing, add the below properties in your application.properties file or
application.yml file.

spring.application.name=zuulserver
zuul.routes.products.path=/api/demo/**
zuul.routes.products.url=http://localhost:8080/
server.port=8111

This means that http calls to /api/demo/ get forwarded to the products service. For
example, /api/demo/products is forwarded to /products.

yaml file users can use the application.yml file shown below:

server:
port: 8111
spring:
application:
name: zuulserver
zuul:

154
Spring Boot

routes:
products:
path: /api/demo/**
url: http://localhost:8080/

Note: The http://localhost:8080/ application should already be running before routing via
Zuul Proxy.

The complete build configuration file is given below.

Maven users can use the pom.xml file given below:

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>zuulserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>zuulserver</name>
<description>Demo project for Spring Boot</description>

155
Spring Boot

</properties>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zuul</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

156
Spring Boot

Gradle users can use the build.gradle file given below:

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
ext {
springCloudVersion = 'Edgware.RELEASE'
}
dependencies {
compile('org.springframework.cloud:spring-cloud-starter-zuul')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-
dependencies:${springCloudVersion}"
}
}

157
Spring Boot

You can create an executable JAR file, and run the Spring Boot application by using the
Maven or Gradle commands given below:

For Maven, you can use the command given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command given below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command shown below:

java –jar <JARFILE>

You can find the application has started on the Tomcat port 8111 as shown here.

158
Spring Boot

Now, hit the URL http://localhost:8111/api/demo/products in your web browser and you
can see the output of /products REST Endpoint as shown below:

159
28. Spring Boot – Spring Cloud Configuration Spring Boot

Server

Spring Cloud Configuration Server is a centralized application that manages all the
application related configuration properties. In this chapter, you will learn in detail about
how to create Spring Cloud Configuration server.

Creating Spring Cloud Configuration Server

First, download the Spring Boot project from the Spring Initializer page and choose the
Spring Cloud Config Server dependency. Observe the screenshot given below:

Now, add the Spring Cloud Config server dependency in your build configuration file as
explained below:

Maven users can add the below dependency into the pom.xml file.

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>

Gradle users can add the below dependency in your build.gradle file.

compile('org.springframework.cloud:spring-cloud-config-server')

Now, add the @EnableConfigServer annotation in your main Spring Boot application class
file. The @EnableConfigServer annotation makes your Spring Boot application act as a
Configuration Server.

160
Spring Boot

The main Spring Boot application class file is given below:

package com.tutorialspoint.configserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
@SpringBootApplication
@EnableConfigServer
public class ConfigserverApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigserverApplication.class, args);
}
}

Now, add the below configuration to your properties file and replace the
application.properties file into bootstrap.properties file. Observe the code given below:

server.port=8888
spring.cloud.config.server.native.searchLocations=file:///C:/configprop/
SPRING_PROFILES_ACTIVE=native

Configuration Server runs on the Tomcat port 8888 and application configuration
properties are loaded from native search locations.

Now, in file:///C:/configprop/, place your client application - application.properties

file. For example, your client application name is config-client, then rename your
application.properties file as config-client.properties and place the properties file on the
path file:///C:/configprop/.

The code for config-client properties file is given below:

welcome.message=Welcome to Spring cloud config server

The complete build configuration file is given below:

Maven users can use pom.xml given below:

<?xml version="1.0" encoding="UTF-8"?>

161
Spring Boot

<artifactId>configserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>configserver</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> 
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

162
Spring Boot

<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Gradle users can use the build.gradle file given below:

<scope>import</scope>
</dependency>
</dependencies>
buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}
apply plugin: 'java'

163
Spring Boot

apply plugin: 'eclipse'

apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

ext {
springCloudVersion = 'Edgware.RELEASE'
}

dependencies {
compile('org.springframework.cloud:spring-cloud-config-server')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-
dependencies:${springCloudVersion}"
}
}

Now, create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands:

For Maven, use the command given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command given below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

164
Spring Boot

Run the JAR file by using the following command:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8888 as shown here:

Now hit the URL http://localhost:8888/config-client/default/master on your web browser

and you can see your config-client application configuration properties as shown here.

165
29. Spring Boot – Spring Cloud Configuration Spring Boot

Client

Some applications may need configuration properties that may need a change and
developers may need to take them down or restart the application to perform this.
However, this might be lead to downtime in production and the need of restarting the
application. Spring Cloud Configuration Server lets developers to load the new
configuration properties without restarting the application and without any downtime.

Working with Spring Cloud Configuration Server

First, download the Spring Boot project from http://start.spring.io/ and choose the Spring
Cloud Config Client dependency. Now, add the Spring Cloud Starter Config dependency in
your build configuration file.

Maven users can add the following dependency into the pom.xml file.

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>

Gradle users can add the following dependency into the build.gradle file.

compile('org.springframework.cloud:spring-cloud-starter-config')

Now, you need to add the @RefreshScope annotation to your main Spring Boot application.
The @RefreshScope annotation is used to load the configuration properties value from the
Config server.

package com.example.configclient;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.context.config.annotation.RefreshScope;
@SpringBootApplication
@RefreshScope
public class ConfigclientApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigclientApplication.class, args);
}
}

166
Spring Boot

Now, add the config server URL in your application.properties file and provide your
application name.

Note: http://localhost:8888 config server should be run before starting the config client
application.

spring.application.name=config-client
spring.cloud.config.uri=http://localhost:8888

The code for writing a simple REST Endpoint to read the welcome message from the
configuration server is given below:

package com.example.configclient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RefreshScope
@RestController
public class ConfigclientApplication {

@Value("${welcome.message}")
String welcomeText;

public static void main(String[] args) {

SpringApplication.run(ConfigclientApplication.class, args);
}

@RequestMapping(value="/")
public String welcomeText() {
return welcomeText;
}
}

167
Spring Boot

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands:

For Maven, you can use the command shown below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command shown below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command shown here:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080 as shown here:

You can see the log in console window; config-client application is fetching the
configuration from the https://localhost:8888

2017-12-08 12:41:57.682 INFO 1104 --- [ main]

c.c.c.ConfigServicePropertySourceLocator : Fetching config from server at:
http://localhost:8888

Now hit the URL, http://localhost:8080/ welcome message is loaded from the
Configuration server.

Now, go and change the property value on the Configuration server and hit the actuator
Endpoint POST URL http://localhost:8080/refresh and see the new configuration property
value in the URL http://localhost:8080/

168
30. Spring Boot – Actuator Spring Boot

Spring Boot Actuator provides secured endpoints for monitoring and managing your Spring
Boot application. By default, all actuator endpoints are secured. In this chapter, you will
learn in detail about how to enable Spring Boot actuator to your application.

Enabling Spring Boot Actuator

To enable Spring Boot actuator endpoints to your Spring Boot application, we need to add
the Spring Boot Starter actuator dependency in our build configuration file.

Maven users can add the below dependency in your pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

Gradle users can add the below dependency in your build.gradle file.

compile group: 'org.springframework.boot', name: 'spring-boot-starter-actuator'

In the application.properties file, we need to disable the security for actuator endpoints.

management.security.enabled=false

YAML file users can add the following property in your application.yml file.

management:
security:
enabled: false

If you want to use the separate port number for accessing the Spring boot actutator
endpoints add the management port number in application.properties file.

management.port=9000

YAML file users can add the following property in your application.yml file.

management:
port: 9000

169
Spring Boot

Now, you can create an executable JAR file, and run the Spring Boot application by using
the following Maven or Gradle commands.

For Maven, you can use the following command:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the following command:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, you can run the JAR file by using the following command:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080. Note that if you specified the
management port number, then same application is running on two different port
numbers.

Some important Spring Boot Actuator endpoints are given below. You can enter them in
your web browser and monitor your application behavior.

ENDPOINTS USAGE

/metrics To view the application metrics such as

memory used, memory free, threads,
classes, system uptime etc.

/env To view the list of Environment variables

used in the application.

/beans To view the Spring beans and its types,

scopes and dependency.

/health To view the application health

/info To view the information about the Spring

Boot application.

/trace To view the list of Traces of your Rest

endpoints.

170
31. Spring Boot – Admin Server Spring Boot

Monitoring your application by using Spring Boot Actuator Endpoint is slightly difficult.
Because, if you have ‘n’ number of applications, every application has separate actuator
endpoints, thus making monitoring difficult. Spring Boot Admin Server is an application
used to manage and monitor your Microservice application.

To handle such situations, CodeCentric Team provides a Spring Boot Admin UI to manage
and monitor all your Spring Boot application Actuator endpoints at one place.

For building a Spring Boot Admin Server we need to add the below dependencies in your
build configuration file.

Maven users can add the below dependencies in your pom.xml file:

<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server</artifactId>
<version>1.5.5</version>
</dependency>
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-server-ui</artifactId>
<version>1.5.5</version>
</dependency>

Gradle users can add the below dependencies in your build.gradle file:

compile group: 'de.codecentric', name: 'spring-boot-admin-server', version:

'1.5.5'

compile group: 'de.codecentric', name: 'spring-boot-admin-server-ui', version:

'1.5.5'

Add the @EnableAdminServer annotation in your main Spring Boot application class file.
The @EnableAdminServer annotation is used to make your as Admin Server to monitor all
other microservices.

package com.tutorialspoint.adminserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import de.codecentric.boot.admin.config.EnableAdminServer;

171
Spring Boot

@SpringBootApplication
@EnableAdminServer
public class AdminserverApplication {
public static void main(String[] args) {
SpringApplication.run(AdminserverApplication.class, args);
}
}

Now, define the server.port and application name in application.properties file a shown:

server.port=9090
spring.application.name=adminserver

For YAML users, use the following properties to define the port number and application
name in application.yml file.

server:
port: 9090
spring:
application:
name: adminserver

The build configuration file is given below.

For Maven users – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>adminserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>adminserver</name>
<description>Demo project for Spring Boot</description>

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Spring Boot

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

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Spring Boot

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

For Gradle users – build.gradle file

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories { mavenCentral()
}

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Spring Boot

dependencies {
compile('org.springframework.boot:spring-boot-starter')
compile group: 'de.codecentric', name: 'spring-boot-admin-server',
version: '1.5.5'
compile group: 'de.codecentric', name: 'spring-boot-admin-server-ui',
version: '1.5.5'
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands:

For Maven, use the command shown here:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under target directory.

For Gradle, use the command shown here:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under build/libs directory.

Now, run the JAR file by using the command given below:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 9090 as shown here:

Now hit the below URL from your web browser and see the Admin Server UI.

http://localhost:9090/

175
32. Spring Boot – Admin Client Spring Boot

For monitoring and managing your microservice application via Spring Boot Admin Server,
you should add the Spring Boot Admin starter client dependency and point out the Admin
Server URI into the application properties file.

Note: For monitoring an application, you should enable the Spring Boot Actuator Endpoints
for your Microservice application.

First, add the following Spring Boot Admin starter client dependency and Spring Boot
starter actuator dependency in your build configuration file.

Maven users can add the following dependencies in your pom.xml file:

<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-starter-client</artifactId>
<version>1.5.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

Gradle users can add the following dependencies in your build.gradle file.

compile group: 'de.codecentric', name: 'spring-boot-admin-starter-client',

version: '1.5.5'

compile('org.springframework.boot:spring-boot-starter-actuator')

Now, add the Spring Boot Admin Server URL into your application properties file.

For properties file users, add the following properties in the application.properties file.

spring.boot.admin.url=http://localhost:9090/

For YAML users, add the following property in application.yml file.

spring:
boot:
admin:
url: http://localhost:9000/

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Spring Boot

Now, create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

For Maven, you can use the command as shown:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command shown:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 9090 as shown:

Now hit the following URL from your web browser and see your spring Boot application is
registered with Spring Boot Admin Server.

http://localhost:9090/

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Now, click the Details button and the see the actuator endpoints in Admin Server UI.

178
33. Spring Boot – Enabling Swagger2 Spring Boot

Swagger2 is an open source project used to generate the REST API documents for RESTful
web services. It provides a user interface to access our RESTful web services via the web
browser.

To enable the Swagger2 in Spring Boot application, you need to add the following
dependencies in our build configurations file.

For Maven users, add the following dependencies in your pom.xml file.

<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>

<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>

For Gradle users, add the following dependencies in your build.gradle file.

compile group: 'io.springfox', name: 'springfox-swagger2', version: '2.7.0'

compile group: 'io.springfox', name: 'springfox-swagger-ui', version: '2.7.0'

Now, add the @EnableSwagger2 annotation in your main Spring Boot application. The
@EnableSwagger2 annotation is used to enable the Swagger2 for your Spring Boot
application.

The code for main Spring Boot application is shown below:

package com.tutorialspoint.swaggerdemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@SpringBootApplication

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Spring Boot

@EnableSwagger2
public class SwaggerDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SwaggerDemoApplication.class, args);
}
}

Next, create Docket Bean to configure Swagger2 for your Spring Boot application. We need
to define the base package to configure REST API(s) for Swagger2.

@Bean
public Docket productApi() {
return new Docket(DocumentationType.SWAGGER_2).select()

.apis(RequestHandlerSelectors.basePackage("com.tutorialspoint.swaggerdemo"
)).build();
}

Now, add this bean in main Spring Boot application class file itself and your main Spring
Boot application class will look as shown below:

package com.tutorialspoint.swaggerdemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@SpringBootApplication
@EnableSwagger2
public class SwaggerDemoApplication {

public static void main(String[] args) {

SpringApplication.run(SwaggerDemoApplication.class, args);
}

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Spring Boot

@Bean
public Docket productApi() {
return new Docket(DocumentationType.SWAGGER_2).select()

.apis(RequestHandlerSelectors.basePackage("com.tutorialspoint.swaggerdemo"
)).build();
}

Now, add the below Spring Boot Starter Web dependency in your build configuration file
to write a REST Endpoints as shown below:

Maven users can add the following dependency in your pom.xml file:

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

Gradle users can add the following dependency in build.gradle file:

compile('org.springframework.boot:spring-boot-starter-web')

Now, the code to build two simple RESTful web services GET and POST in Rest Controller
file is shown here:

package com.tutorialspoint.swaggerdemo;

import java.util.ArrayList;
import java.util.List;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class SwaggerAPIController {

@RequestMapping(value="/products", method=RequestMethod.GET)
public List<String> getProducts() {
List<String> productsList = new ArrayList<>();
productsList.add("Honey");

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Spring Boot

productsList.add("Almond");
return productsList;
}

@RequestMapping(value="/products", method=RequestMethod.POST)
public String createProduct() {
return "Product is saved successfully";
}
}

The complete build configuration file is given below:

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>swagger-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>swagger-demo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

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Spring Boot

<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.7.0</version>
</dependency>

<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.7.0</version>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

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Spring Boot

</project>

Gradle – build.gradle

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
compile group: 'io.springfox', name: 'springfox-swagger2', version:
'2.7.0'
compile group: 'io.springfox', name: 'springfox-swagger-ui', version:
'2.7.0'
}

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

For Maven, you can use the command shown here:

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Spring Boot

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command as shown here:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command shown here:

java –jar <JARFILE>

Now, the application will start on the Tomcat port 8080 as shown:

Now, hit the URL in your web browser and see the Swagger API functionalities.

http://localhost:8080/swagger-ui.html

185
34. Spring Boot – Creating Docker Image Spring Boot

Docker is a container management service that eases building and deployment. If you are
a beginner to Docker, you can learn about is in detail at this link:
https://www.tutorialspoint.com/docker/index.htm

In this chapter, we are going to see How to create a Docker image by using Maven and
Gradle dependencies for your Spring Boot application.

Create Dockerfile
First, create a file with the name Dockerfile under the directories src/main/docker with
the contents shown below. Note that this file is important to create a Docker image.

FROM java:8
VOLUME /tmp
ADD dockerapp-0.0.1-SNAPSHOT.jar app.jar
RUN bash -c 'touch /app.jar'
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

Maven
For Maven, add the Docker Maven plugin into your build configuration file pom.xml

<properties>
<docker.image.prefix>spring-boot-tutorialspoint</docker.image.prefix>
</properties>
<build>
<plugins>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.0.0</version>
<configuration>

<imageName>${docker.image.prefix}/${project.artifactId}</imageName>

<dockerDirectory>src/main/docker</dockerDirectory>
<resources>
<resource>

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Spring Boot

<directory>${project.build.directory}</directory>

<include>${project.build.finalName}.jar</include>
</resource>
</resources>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

The complete pom.xml file is given below:

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>dockerapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>dockerapp</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

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Spring Boot

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>com.spotify</groupId>
<artifactId>docker-maven-plugin</artifactId>
<version>1.0.0</version>
<configuration>

<imageName>${docker.image.prefix}/${project.artifactId}</imageName>

<dockerDirectory>src/main/docker</dockerDirectory>
<resources>
<resource>

<directory>${project.build.directory}</directory>

<include>${project.build.finalName}.jar</include>

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Spring Boot

</resource>
</resources>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Now, you can run your application by using the Maven command mvn package
docker:build

Note: Enable the Expose daemon on tcp://localhost:2375 without TLS.

After build success, you can see the output on the console as shown below:

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Spring Boot

Now, see the Docker images by the command using docker images and see the image
info on the console.

Gradle
To build a Docker image by using Gradle build configuration, we need to add the docker
plugin and need to write a task buildDocker to create a Docker image.

The code for Gradle Docker configuration is given below.

buildscript {
.....
dependencies {
.....
classpath('se.transmode.gradle:gradle-docker:1.2')
}
}

group = 'spring-boot-tutorialspoint'

.....
apply plugin: 'docker'

task buildDocker(type: Docker, dependsOn: build) {

applicationName = jar.baseName
dockerfile = file('src/main/docker/Dockerfile')
doFirst {
copy {
from jar
into stageDir
}
}
}

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Spring Boot

The complete build.gradle file is given below.

group = 'spring-boot-tutorialspoint'

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'docker'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

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Spring Boot

task buildDocker(type: Docker, dependsOn: build) {

applicationName = jar.baseName
dockerfile = file('src/main/docker/Dockerfile')
doFirst {
copy {
from jar
into stageDir
}
}
}

Now, create a Docker image by using the command shown below:

gradle build buildDocker

After executing the command, you can see the BUILD SUCCESSFUL log on the console
window.

Now, see the Docker images by the command using docker images and see the image’s
info on the console.

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Spring Boot

193
35. Spring Boot – Tracing Micro Service Logs Spring Boot

Most developers face difficulty of tracing logs if any issue occurred. This can be solved by
Spring Cloud Sleuth and ZipKin server for Spring Boot application.

Spring Cloud Sleuth

Spring cloud Sleuth logs are printed in the following format:

[application-name,traceid,spanid,zipkin-export]

Where,

 Application-name = Name of the application

 Traceid = each request and response traceid is same when calling same service or
one service to another service.
 Spanid = Span Id is printed along with Trace Id. Span Id is different every request
and response calling one service to another service.
 Zipkin-export = By default it is false. If it is true, logs will be exported to the Zipkin
server.

Now, add the Spring Cloud Starter Sleuth dependency in your build configuration file as
follows:

Maven users can add the following dependency in your pom.xml file:

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-sleuth</artifactId>
</dependency>

Gradle users can add the following dependency in your build.gradle file:

compile('org.springframework.cloud:spring-cloud-starter-sleuth')

Now, add the Logs into your Spring Boot application Rest Controller class file as shown
here:

package com.tutorialspoint.sleuthapp;

import java.util.logging.Level;
import java.util.logging.Logger;

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Spring Boot

@SpringBootApplication
@RestController
public class SleuthappApplication {

private static final Logger LOG =

Logger.getLogger(SleuthappApplication.class.getName());

public static void main(String[] args) {

SpringApplication.run(SleuthappApplication.class, args);
}

@RequestMapping("/")
public String index() {
LOG.log(Level.INFO, "Index API is calling");
return "Welcome Sleuth!";
}
}

Now, add the application name in application.properties file as shown:

spring.application.name=tracinglogs

The complete code for build configuration file is given below:

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>sleuthapp</artifactId>
<version>0.0.1-SNAPSHOT</version>

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Spring Boot

<name>sleuthapp</name>
<description>Demo project for Spring Boot</description>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-sleuth</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

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Spring Boot

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

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Spring Boot

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

ext {
springCloudVersion = 'Edgware.RELEASE'
}

dependencies {
compile('org.springframework.cloud:spring-cloud-starter-sleuth')
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-
dependencies:${springCloudVersion}"
}
}

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

For Maven, you can use the following command:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

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Spring Boot

For Gradle, you can use the following command:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command shown here:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080.

Now, hit the URL in your web browser and see the output in console log.

http://localhost:8080/

You can see the following logs in the console window. Observe that log is printed in the
following format [application-name, traceid, spanid, zipkin-export]

Zipkin Server
Zipkin is an application that monitors and manages the Spring Cloud Sleuth logs of your
Spring Boot application. To build a Zipkin server, we need to add the Zipkin UI and Zipkin
Server dependencies in our build configuration file.

Maven users can add the following dependency in your pom.xml file:

<dependency>
<groupId>io.zipkin.java</groupId>
<artifactId>zipkin-server</artifactId>
</dependency>
<dependency>
<groupId>io.zipkin.java</groupId>
<artifactId>zipkin-autoconfigure-ui</artifactId>
</dependency>

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Spring Boot

Gradle users can add the below dependency in your build.gradle file:

compile('io.zipkin.java:zipkin-autoconfigure-ui')
compile('io.zipkin.java:zipkin-server')

Now, configure the server.port=9411 in application properties file.

For properties file users, add the below property in application.properties file.

server.port=9411

For YAML users, add the below property in application.yml file.

server:
port: 9411

Add the @EnableZipkinServer annotation in your main Spring Boot application class fie.
The @EnableZipkinServer annotation is used to enable your application act as a Zipkin
server.

package com.tutorialspoint.zipkinapp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import zipkin.server.EnableZipkinServer;

@SpringBootApplication
@EnableZipkinServer
public class ZipkinappApplication {

public static void main(String[] args) {

SpringApplication.run(ZipkinappApplication.class, args);
}
}

The code for complete build configuration file is given below.

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

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Spring Boot

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">

<groupId>com.tutorialspoint</groupId>
<artifactId>zipkinapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>zipkinapp</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

<dependencies>
<dependency>
<groupId>io.zipkin.java</groupId>
<artifactId>zipkin-server</artifactId>
</dependency>

<dependency>
<groupId>io.zipkin.java</groupId>
<artifactId>zipkin-autoconfigure-ui</artifactId>
</dependency>

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Spring Boot

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

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Spring Boot

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

ext {
springCloudVersion = 'Edgware.RELEASE'
}

dependencies {
compile('io.zipkin.java:zipkin-autoconfigure-ui')
compile('io.zipkin.java:zipkin-server')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

dependencyManagement {

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Spring Boot

imports {
mavenBom "org.springframework.cloud:spring-cloud-
dependencies:${springCloudVersion}"
}
}

You can create an executable JAR file, and run the Spring Boot application by using the
below Maven or Gradle commands:

For Maven, use the command given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command given below:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Run the JAR file by using the command shown:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 9411 as shown below:

Now, hit the below URL and see the Zipkin server UI.

http://localhost:9411/zipkin/

Then, add the following dependency in your client service application and point out the
Zipkin Server URL to trace the microservice logs via Zipkin UI.

Now, add the Spring Cloud Starter Zipkin dependency in your build configuration file as
shown:

Maven users can add the following dependency in pom.xml file:

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Spring Boot

<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-sleuth-zipkin</artifactId>
</dependency>

Gradle users can add the below dependency in build.gradle file:

compile('org.springframework.cloud:spring-cloud-sleuth-zipkin')

Now, add the Always Sampler Bean in your Spring Boot application to export the logs
into Zipkin server.

@Bean
public AlwaysSampler defaultSampler() {
return new AlwaysSampler();
}

If you add the AlwaysSampler Bean, then automatically Spring Sleuth Zipkin Export option
will change from false to true.

Next, configure your Zipkin Server base URL in client service application.properties file.

spring.zipkin.baseUrl=http://localhost:9411/zipkin/

Then, provide the trace id and find the traces in Zipkin UI.

http://localhost:9411/zipkin/traces/{traceid}/

205
36. Spring Boot – Flyway Database Spring Boot

Flyway is a version control application to evolve your Database schema easily and reliably
across all your instances. To learn more about Flyway, you can use the link:
https://flywaydb.org/

Many software projects use relational databases. This requires the handling of database
migrations, also often called schema migrations.

In this chapter, you are going to learn in detail about how to configure Flyway database in
your Spring Boot application.

Configuring Flyway Database

First, download the Spring Boot project from Spring Initializer page http://start.spring.io/
and choose the following dependencies:

 Spring Boot Starter Web

 Flyway
 MySQL
 JDBC

Maven users can add the following dependencies in pom.xml file.

<dependency>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

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Spring Boot

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

Gradle users can add the following dependencies in build.gradle file.

compile('org.flywaydb:flyway-core')
compile('org.springframework.boot:spring-boot-starter-jdbc')
compile('org.springframework.boot:spring-boot-starter-web')
compile('mysql:mysql-connector-java')

In application properties, we need to configure the database properties for creating a

DataSource and also flyway properties we need to configure in application properties.

For properties file users, add the below properties in the application.properties file.

spring.application.name=flywayapp
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/USERSERVICE?autoreconnect=tru
e
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.testOnBorrow=true
spring.datasource.testWhileIdle=true
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=30000
spring.datasource.validationQuery=SELECT 1
spring.datasource.max-active=15
spring.datasource.max-idle=10
spring.datasource.max-wait=8000
flyway.url=jdbc:mysql://localhost:3306/mysql
flyway.schemas=USERSERVICE
flyway.user=root
flyway.password=root

YAML users can add the following properties in application.yml file.

spring:
application:
name: flywayapp

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Spring Boot

datasource:
driverClassName: com.mysql.jdbc.Driver
url: "jdbc:mysql://localhost:3306/USERSERVICE?autoreconnect=true"
password: "root"
username: "root"
testOnBorrow: true
testWhileIdle: true
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 30000
validationQuery: SELECT 1
max-active: 15
max-idle: 10
max-wait: 8000
flyway:
url: jdbc:mysql://localhost:3306/mysql
schemas: USERSERVICE
user: "root"
password: "root"

Now, create a SQL file under the src/main/resources/db/migration directory. Name

the SQL file as “V1__Initial.sql”

CREATE TABLE USERS (ID INT AUTO_INCREMENT PRIMARY KEY, USERID VARCHAR(45));
INSERT INTO USERS (ID, USERID) VALUES (1, 'tutorialspoint.com');

The main Spring Boot application class file code is given below:

package com.tutorialspoint.flywayapp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class FlywayappApplication {

public static void main(String[] args) {

SpringApplication.run(FlywayappApplication.class, args);
}
}

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Spring Boot

The complete build configuration file is given below.

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>flywayapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>flywayapp</name>
<description>Demo project for Spring Boot</description>

<dependencies>
<dependency>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>

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Spring Boot

<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

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Spring Boot

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.flywaydb:flyway-core')
compile('org.springframework.boot:spring-boot-starter-jdbc')
compile('org.springframework.boot:spring-boot-starter-web')
compile('mysql:mysql-connector-java')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the Spring Boot application by using the
Maven or Gradle commands given below:

For Maven, you can use the command shown here:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command shown here:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the following command:

java –jar <JARFILE>

Now, Tomcat started on the port 8080 and in the console window you can see the flyway
database logs as shown here.

211
Spring Boot

You can now go to the database and do the select queries.

212
37. Spring Boot – Sending Email Spring Boot

By using Spring Boot RESTful web service, you can send an email with Gmail Transport
Layer Security. In this chapter, let us understand in detail how to use this feature.

First, we need to add the Spring Boot Starter Mail dependency in your build configuration
file.

Maven users can add the following dependency into the pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>

Gradle users can add the following dependency in your build.gradle file.

compile('org.springframework.boot:spring-boot-starter-mail')

The code of main Spring Boot application class file is given below:

package com.tutorialspoint.emailapp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class EmailappApplication {

public static void main(String[] args) {

SpringApplication.run(EmailappApplication.class, args);
}
}

You can write a simple Rest API to send to email in Rest Controller class file as shown.

package com.tutorialspoint.emailapp;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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Spring Boot

@RestController
public class EmailController {

@RequestMapping(value="/sendemail")
public String sendEmail() {
return "Email sent successfully";
}
}

You can write a method to send the email with Attachment. Define the mail.smtp
properties and used PasswordAuthentication.

private void sendmail() throws AddressException, MessagingException,

IOException {

Properties props = new Properties();

props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");

Session session = Session.getInstance(props, new

javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication()
{
return new
PasswordAuthentication("tutorialspoint@gmail.com", "<your password>");
}
});

Message msg = new MimeMessage(session);

msg.setFrom(new InternetAddress("tutorialspoint@gmail.com",
false));

msg.setRecipients(Message.RecipientType.TO,
InternetAddress.parse("tutorialspoint@gmail.com"));
msg.setSubject("Tutorials point email");
msg.setContent("Tutorials point email", "text/html");
msg.setSentDate(new Date());

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Spring Boot

MimeBodyPart messageBodyPart = new MimeBodyPart();

messageBodyPart.setContent("Tutorials point email", "text/html");

Multipart multipart = new MimeMultipart();

multipart.addBodyPart(messageBodyPart);
MimeBodyPart attachPart = new MimeBodyPart();

attachPart.attachFile("/var/tmp/image19.png");
multipart.addBodyPart(attachPart);
msg.setContent(multipart);
Transport.send(msg); }

Now, call the above sendmail() method from the Rest API as shown:

@RequestMapping(value = "/sendemail")
public String sendEmail() throws AddressException, MessagingException,
IOException {
sendmail();
return "Email sent successfully"; }

Note: Please switch ON allow less secure apps in your Gmail account settings before
sending an email.

The complete build configuration file is given below.

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.tutorialspoint</groupId>
<artifactId>emailapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>emailapp</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>

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Spring Boot

<version>1.5.9.RELEASE</version>
<relativePath/> 
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-
8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build> </project>

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Spring Boot

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-mail')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

217
Spring Boot

Now, you can create an executable JAR file, and run the Spring Boot application by using
the Maven or Gradle commands shown below:

For Maven, you can use the command as shown:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command given below:

java –jar <JARFILE>

You can see that the application has started on the Tomcat port 8080.

Now hit the following URL from your web browser and you will receive an email.

http://localhost:8080/sendemail

218
38. Spring Boot – Hystrix Spring Boot

Hystrix is a library from Netflix. Hystrix isolates the points of access between the services,
stops cascading failures across them and provides the fallback options.

For example, when you are calling a 3rd party application, it takes more time to send the
response. So at that time, the control goes to the fallback method and returns the custom
response to your application.

In this chapter you are going to see How to implement the Hystrix in a Spring Boot
application.

First, we need to add the Spring Cloud Starter Hystrix dependency in our build
configuration file.

Maven users can add the following dependency in the pom.xml file:

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>

Gradle users can add the following dependency in the build.gradle file:

compile('org.springframework.cloud:spring-cloud-starter-hystrix')

Now, add the @EnableHystrix annotation into your main Spring Boot application class file.
The @EnableHystrix annotation is used to enable the Hystrix functionalities into your
Spring Boot application.

The main Spring Boot application class file code is given below:

package com.tutorialspoint.hystrixapp;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
@SpringBootApplication
@EnableHystrix
public class HystrixappApplication {
public static void main(String[] args) {
SpringApplication.run(HystrixappApplication.class, args);
}
}

Now write a simple Rest Controller such that it returns the String after 3 seconds from the
requested time.

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Spring Boot

@RequestMapping(value="/")
public String hello() throws InterruptedException {
Thread.sleep(3000);
return "Welcome Hystrix";
}

Now, add the @Hystrix command and @HystrixProperty for the Rest API and define the
timeout in milliseconds value.

@HystrixCommand(fallbackMethod = "fallback_hello", commandProperties = {

@HystrixProperty(name =
"execution.isolation.thread.timeoutInMilliseconds", value = "1000")})

Next, define the fallback method fallback_hello() if the request takes a long time to
respond.

private String fallback_hello() {

return "Request fails. It takes long time to response";
}

The complete Rest Controller class file that contains REST API and Hystrix properties is
shown here:

@RequestMapping(value="/")
@HystrixCommand(fallbackMethod = "fallback_hello", commandProperties = {
@HystrixProperty(name =
"execution.isolation.thread.timeoutInMilliseconds", value = "1000")})
public String hello() throws InterruptedException {
Thread.sleep(3000);
return "Welcome Hystrix";
}

private String fallback_hello() {

return "Request fails. It takes long time to response";
}

In this example, REST API written in main Spring Boot application class file itself.

package com.tutorialspoint.hystrixapp;

import org.springframework.boot.SpringApplication;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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Spring Boot

import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;

@SpringBootApplication
@EnableHystrix
@RestController
public class HystrixappApplication {

public static void main(String[] args) {

SpringApplication.run(HystrixappApplication.class, args);
}

private String fallback_hello() {

return "Request fails. It takes long time to response";
}
}

221
Spring Boot

The complete build configuration file is given below.

Maven – pom.xml file

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>hystrixapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>hystrixapp</name>
<description>Demo project for Spring Boot</description>

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>

222
Spring Boot

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

223
Spring Boot

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
ext {
springCloudVersion = 'Edgware.RELEASE'
}
dependencies {
compile('org.springframework.cloud:spring-cloud-starter-hystrix')
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
dependencyManagement {
imports {
mavenBom "org.springframework.cloud:spring-cloud-
dependencies:${springCloudVersion}"
}
}

224
Spring Boot

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands:

For Maven, use the command as shown:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command given below:

java –jar <JARFILE>

This will start the application on the Tomcat port 8080 as shown below:

Now, hit the URL http://localhost:8080/ from your web browser, and see the Hystrix
response. The API takes 3 seconds to respond, but Hystrix timeout is 1 second.

225
39. Spring Boot – Web Socket Spring Boot

In this chapter, let us understand how to build an interactive web application by using
Spring Boot with Web sockets.

To build an interactive web application in Spring Boot with Web socket, you need to add
the following dependencies.

Maven users should add the following dependencies in the pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-locator</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>sockjs-client</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>stomp-websocket</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.7</version> </dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.1.0</version>
</dependency>

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Spring Boot

Gradle users can add the following dependencies in your build.gradle file:

compile("org.springframework.boot:spring-boot-starter-websocket")
compile("org.webjars:webjars-locator")
compile("org.webjars:sockjs-client:1.0.2")
compile("org.webjars:stomp-websocket:2.3.3")
compile("org.webjars:bootstrap:3.3.7")
compile("org.webjars:jquery:3.1.0")

Let us create a Message handling controller to work with STOMP messaging. STOMP
messages can be routed to @Controller class file. For example, GreetingController is
mapped to handle the messages to destination “/hello”.

package com.tutorialspoint.websocketapp;

import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;

@Controller
public class GreetingController {

@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Greeting greeting(HelloMessage message) throws Exception {
Thread.sleep(1000); // simulated delay
return new Greeting("Hello, " + message.getName() + "!");
}

Now, configure Spring for STOMP messaging. Write a WebSocketConfig class file that
extends the AbstractWebSocketMessageBrokerConfigurer class as shown below.

package com.tutorialspoint.websocketapp;

import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import
org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBroker
Configurer;

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Spring Boot

import
org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/tutorialspoint-websocket").withSockJS();
}

The @EnableWebSocketMessageBroker annotation is used to configure the Web socket

message broker to create STOMP endpoints.

You can create a browser client file under the src/main/resources/static/index.html as

shown:

<!DOCTYPE html>
<html>
<head>
<title>Hello WebSocket</title>
<link href="/webjars/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<link href="/main.css" rel="stylesheet">
<script src="/webjars/jquery/jquery.min.js"></script>
<script src="/webjars/sockjs-client/sockjs.min.js"></script>
<script src="/webjars/stomp-websocket/stomp.min.js"></script>
<script src="/app.js"></script>
</head>
<body>

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Spring Boot

<noscript><h2 style="color: #ff0000">Seems your browser doesn't support

Javascript! Websocket relies on Javascript being
enabled. Please enable
Javascript and reload this page!</h2></noscript>
<div id="main-content" class="container">
<div class="row">
<div class="col-md-6">
<form class="form-inline">
<div class="form-group">
<label for="connect">WebSocket connection:</label>
<button id="connect" class="btn btn-default"
type="submit">Connect</button>
<button id="disconnect" class="btn btn-default"
type="submit" disabled="disabled">Disconnect
</button>
</div>
</form>
</div>
<div class="col-md-6">
<form class="form-inline">
<div class="form-group">
<label for="name">What is your name?</label>
<input type="text" id="name" class="form-control"
placeholder="Your name here...">
</div>
<button id="send" class="btn btn-default"
type="submit">Send</button>
</form>
</div>
</div>
<div class="row">
<div class="col-md-12">
<table id="conversation" class="table table-striped">
<thead>
<tr>
<th>Greetings</th>
</tr>
</thead>

229
Spring Boot

Let us create an app.js file to consume and produce the messages by using STOMP.

var stompClient = null;

function disconnect() {

230
Spring Boot

if (stompClient !== null) {

stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}

function sendName() {
stompClient.send("/app/hello", {}, JSON.stringify({'name':
$("#name").val()}));
}

function showGreeting(message) {
$("#greetings").append("<tr><td>" + message + "</td></tr>");
}

$(function () {
$("form").on('submit', function (e) {
e.preventDefault();
});
$( "#connect" ).click(function() { connect(); });
$( "#disconnect" ).click(function() { disconnect(); });
$( "#send" ).click(function() { sendName(); });
});

The code for main Spring Boot application is shown below.

package com.tutorialspoint.websocketapp;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class WebsocketappApplication {

public static void main(String[] args) {

SpringApplication.run(WebsocketappApplication.class, args);
} }

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Spring Boot

The complete build configuration file is given below.

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>websocketapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>websocketapp</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-locator</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>sockjs-client</artifactId>

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Spring Boot

<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>stomp-websocket</artifactId>
<version>2.3.3</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.7</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.1.0</version>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

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Spring Boot

Gradle – build.gradle

buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:1.5.9.RELEASE")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

jar {
baseName = 'websocketapp'
version = '0.1.0'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile("org.springframework.boot:spring-boot-starter-websocket")
compile("org.webjars:webjars-locator")
compile("org.webjars:sockjs-client:1.0.2")
compile("org.webjars:stomp-websocket:2.3.3")
compile("org.webjars:bootstrap:3.3.7")
compile("org.webjars:jquery:3.1.0")

testCompile("org.springframework.boot:spring-boot-starter-test")
}

234
40. Spring Boot – Batch Service Spring Boot

You can create an executable JAR file, and run the Spring Boot application by using the
Maven or Gradle commands as shown below:

For Maven, you can use the command given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Run the JAR file by using the command given here:

java –jar <JARFILE>

Now, the application has started on the Tomcat port 8080 as shown.

Now, hit the URL http://localhost:8080/ in your web browser and connect the web socket
and send the greeting and receive the message.

235
Spring Boot

Batch Service is a process to execute more than one command in a single task. In this
chapter, you are going to learn how to create batch service in a Spring Boot application.

Let us consider an example where we are going to save the CSV file content into HSQLDB.

To create a Batch Service program, we need to add the Spring Boot Starter Batch
dependency and HSQLDB dependency in our build configuration file.

Maven users can add the following dependencies in pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-batch</artifactId>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
</dependency>

Gradle users can add the following dependencies in build.gradle file.

compile("org.springframework.boot:spring-boot-starter-batch")
compile("org.hsqldb:hsqldb")

Now, add the simple CSV data file under classpath resources – src/main/resources and
name the file as file.csv as shown:

William,John
Mike, Sebastian
Lawarance, Lime

Next, write a SQL script for HSQLDB – under the classpath resource directory –
src/main/resources/schema-all.sql

DROP TABLE USERS IF EXISTS;

CREATE TABLE USERS (
user_id BIGINT IDENTITY NOT NULL PRIMARY KEY,
first_name VARCHAR(20),
last_name VARCHAR(20));

Create a POJO class for USERS model as shown:

package com.tutorialspoint.batchservicedemo;
public class User {

236
Spring Boot

private String lastName;

private String firstName;

public User() {

public User(String firstName, String lastName) {

this.firstName = firstName;
this.lastName = lastName;
}

public void setFirstName(String firstName) {

this.firstName = firstName;
}

public String getFirstName() {

return firstName;
}

public String getLastName() {

return lastName;
}

public void setLastName(String lastName) {

this.lastName = lastName;
}

@Override
public String toString() {
return "firstName: " + firstName + ", lastName: " + lastName;
} }

Now, create an intermediate processor to do the operations after the reading the data
from the CSV file and before writing the data into SQL.

package com.tutorialspoint.batchservicedemo;

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Spring Boot

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.batch.item.ItemProcessor;

public class UserItemProcessor implements ItemProcessor<User, User> {

private static final Logger log =

LoggerFactory.getLogger(UserItemProcessor.class);

@Override
public User process(final User user) throws Exception {
final String firstName = user.getFirstName().toUpperCase();
final String lastName = user.getLastName().toUpperCase();

final User transformedPerson = new User(firstName, lastName);

log.info("Converting (" + user + ") into (" + transformedPerson +

")");

return transformedPerson;
}

Let us create a Batch configuration file, to read the data from CSV and write into the SQL
file as shown below. We need to add the @EnableBatchProcessing annotation in the
configuration class file. The @EnableBatchProcessing annotation is used to enable the
batch operations for your Spring Boot application.

package com.tutorialspoint.batchservicedemo;
import javax.sql.DataSource;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.Step;

import
org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import
org.springframework.batch.core.configuration.annotation.JobBuilderFactory;

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Spring Boot

import
org.springframework.batch.core.configuration.annotation.StepBuilderFactory;

import org.springframework.batch.core.launch.support.RunIdIncrementer;
import
org.springframework.batch.item.database.BeanPropertyItemSqlParameterSourceProvi
der;
import org.springframework.batch.item.database.JdbcBatchItemWriter;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;
import org.springframework.batch.item.file.mapping.DefaultLineMapper;
import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;

@Configuration
@EnableBatchProcessing
public class BatchConfiguration {

@Autowired
public JobBuilderFactory jobBuilderFactory;

@Autowired
public StepBuilderFactory stepBuilderFactory;

@Autowired
public DataSource dataSource;

@Bean
public FlatFileItemReader<User> reader() {
FlatFileItemReader<User> reader = new FlatFileItemReader<User>();
reader.setResource(new ClassPathResource("file.csv"));
reader.setLineMapper(new DefaultLineMapper<User>() {
{
setLineTokenizer(new DelimitedLineTokenizer() {
{

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Spring Boot

setNames(new String[] { "firstName",

"lastName" });
}
});
setFieldSetMapper(new
BeanWrapperFieldSetMapper<User>() {
{
setTargetType(User.class);
}
});
}
});
return reader;
}

@Bean
public UserItemProcessor processor() {
return new UserItemProcessor();
}

@Bean
public JdbcBatchItemWriter<User> writer() {
JdbcBatchItemWriter<User> writer = new JdbcBatchItemWriter<User>();
writer.setItemSqlParameterSourceProvider(new
BeanPropertyItemSqlParameterSourceProvider<User>());
writer.setSql("INSERT INTO USERS (first_name, last_name) VALUES
(:firstName, :lastName)");
writer.setDataSource(dataSource);
return writer;
}

@Bean
public Job importUserJob(JobCompletionNotificationListener listener) {
return jobBuilderFactory.get("importUserJob").incrementer(new
RunIdIncrementer()).listener(listener)
.flow(step1()).end().build();
}

@Bean

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Spring Boot

public Step step1() {

return stepBuilderFactory.get("step1").<User,
User>chunk(10).reader(reader()).processor(processor())
.writer(writer()).build();
}
}

The reader() method is used to read the data from the CSV file and writer() method is
used to write a data into the SQL.

Next, we will have to write a Job Completion Notification Listener class – used to notify
after the Job completion.

package com.tutorialspoint.batchservicedemo;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.batch.core.BatchStatus;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.listener.JobExecutionListenerSupport;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Component;

@Component
public class JobCompletionNotificationListener extends
JobExecutionListenerSupport {

private static final Logger log =

LoggerFactory.getLogger(JobCompletionNotificationListener.class);

private final JdbcTemplate jdbcTemplate;

@Autowired
public JobCompletionNotificationListener(JdbcTemplate jdbcTemplate) {

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Spring Boot

this.jdbcTemplate = jdbcTemplate;
}

@Override
public void afterJob(JobExecution jobExecution) {
if (jobExecution.getStatus() == BatchStatus.COMPLETED) {
log.info("!!! JOB FINISHED !! It's time to verify the
results!!");

List<User> results = jdbcTemplate.query("SELECT first_name,

last_name FROM USERS", new RowMapper<User>() {
@Override
public User mapRow(ResultSet rs, int row) throws
SQLException {
return new User(rs.getString(1),
rs.getString(2));
}
});

for (User person : results) {

log.info("Found <" + person + "> in the database.");
}

}
}
}

Now, create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

For Maven, use the command as shown:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Run the JAR file by using the command given here:

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Spring Boot

java –jar <JARFILE>

You can see the output in console window as shown:

243
41. Spring Boot – Spring for Apache Kafka Spring Boot

Apache Kafka is an open source project used to publish and subscribe the messages based
on the fault-tolerant messaging system. It is fast, scalable and distributed by design. If
you are a beginner to Kafka, or want to gain a better understanding on it, please refer to
this link: https://www.tutorialspoint.com/apache_kafka/

In this chapter, we are going to see how to implement the Apache Kafka in Spring Boot
application.

First, we need to add the Spring Kafka dependency in our build configuration file.

Maven users can add the following dependency in the pom.xml file.

<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>

Gradle users can add the following dependency in the build.gradle file.

compile group: 'org.springframework.kafka', name: 'spring-kafka', version:

'2.1.0.RELEASE'

Producing Messages
To produce messages into Apache Kafka, we need to define the Configuration class for
Producer configuration as shown:

package com.tutorialspoint.kafkademo;

import java.util.HashMap;
import java.util.Map;

import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;

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Spring Boot

@Configuration
public class KafkaProducerConfig {

@Bean
public ProducerFactory<String, String> producerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,
"localhost:9092");
configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG,
StringSerializer.class);
configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,
StringSerializer.class);
return new DefaultKafkaProducerFactory<>(configProps);
}

@Bean
public KafkaTemplate<String, String> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
}

To publish a message, auto wire the Kafka Template object and produce the message as
shown.

@Autowired
private KafkaTemplate<String, String> kafkaTemplate;

public void sendMessage(String msg) {

kafkaTemplate.send(topicName, msg);
}

Consuming a Message
To consume messages, we need to write a Consumer configuration class file as shown
below.

package com.tutorialspoint.kafkademo;
import java.util.HashMap;
import java.util.Map;
import org.apache.kafka.clients.consumer.ConsumerConfig;

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Spring Boot

import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import
org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;

@EnableKafka
@Configuration
public class KafkaConsumerConfig {

@Bean
public ConsumerFactory<String, String> consumerFactory() {
Map<String, Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
"localhost:2181");
props.put(ConsumerConfig.GROUP_ID_CONFIG, "group-id");
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
StringDeserializer.class);
return new DefaultKafkaConsumerFactory<>(props);
}

@Bean
public ConcurrentKafkaListenerContainerFactory<String, String>
kafkaListenerContainerFactory() {

ConcurrentKafkaListenerContainerFactory<String, String> factory =

new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}

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Spring Boot

Next, write a Listener to listen to the messages.

@KafkaListener(topics = "tutorialspoint", groupId = "group-id")

public void listen(String message) {
System.out.println("Received Messasge in group - group-id: " +
message);
}

Let us call the sendMessage() method from ApplicationRunner class run method from the
main Spring Boot application class file and consume the message from the same class file.

Your main Spring Boot application class file code is given below:

package com.tutorialspoint.kafkademo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.kafka.core.KafkaTemplate;

@SpringBootApplication
public class KafkaDemoApplication implements ApplicationRunner {

@Autowired
private KafkaTemplate<String, String> kafkaTemplate;

public void sendMessage(String msg) {

kafkaTemplate.send("tutorialspoint", msg);
}

public static void main(String[] args) {

SpringApplication.run(KafkaDemoApplication.class, args);
}

@KafkaListener(topics = "tutorialspoint", groupId = "group-id")

public void listen(String message) {
System.out.println("Received Messasge in group - group-id: " +
message);

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Spring Boot

@Override
public void run(ApplicationArguments args) throws Exception {
sendMessage("Hi Welcome to Spring For Apache Kafka");
}
}

The code for complete build configuration file is given below.

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>kafka-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>kafka-demo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

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Spring Boot

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

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Spring Boot

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter')
compile group: 'org.springframework.kafka', name: 'spring-kafka', version:
'2.1.0.RELEASE'
testCompile('org.springframework.boot:spring-boot-starter-test')
}

Now, create an executable JAR file, and run the Spring Boot application by using the below
Maven or Gradle commands as shown:

For Maven, use the command as shown:

250
Spring Boot

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Run the JAR file by using the command given here:

java –jar <JARFILE>

You can see the output in console window.

251
42. Spring Boot – Twilio Spring Boot

Twilio is a 3rd party application used to send SMS and make voice calls from our application.
It allows us to send the SMS and make voice calls programmatically.

In this chapter, you are going to learn how to implement the SMS sending and making
voice calls by using Spring Boot with Twilio.

Note: We used the Trail account in Twilio to send the SMS and making voice calls. You
can learn more about Twilio at https://www.twilio.com/.

First, we need to add the Twilio dependency in our build configuration file.

Maven users can add the following dependency in the pom.xml file.

<dependency>
<groupId>com.twilio.sdk</groupId>
<artifactId>twilio</artifactId>
<version>7.16.1</version>
</dependency>

Gradle users can add the following dependency in the build.gradle file.

compile group: "com.twilio.sdk", name:"twilio", version: "7.16.1"

Now, initialize the Twilio account with ACCOUNT_SID and AUTH_ID in static block as
shown:

static {
Twilio.init(ACCOUNT_SID, AUTH_ID);
}

Sending SMS
To send the SMS, we need to provide a from-number and to-number to the
Message.create() method. Message body content also we need to provide for the method
Message.creator()as shown:

Message.creator(new PhoneNumber("to-number"), new PhoneNumber("from-number"),

"Message from Spring Boot Application").create();

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Spring Boot

The main Spring Boot application class file looks below.

package com.tutorialspoint.smsdemo;

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import com.twilio.Twilio;
import com.twilio.rest.api.v2010.account.Message;
import com.twilio.type.PhoneNumber;

@SpringBootApplication
public class SmsdemoApplication implements ApplicationRunner {

private final static String ACCOUNT_SID = "<your-account-sid>";

private final static String AUTH_ID = "<your-auth-id>";

static {
Twilio.init(ACCOUNT_SID, AUTH_ID);
}

public static void main(String[] args) {

SpringApplication.run(SmsdemoApplication.class, args);
}

@Override
public void run(ApplicationArguments arg0) throws Exception {
Message.creator(new PhoneNumber("to-number"), new
PhoneNumber("from-number"),
"Message from Spring Boot Application").create();

}
}

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Spring Boot

The complete code to build configuration file is given below:

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>smsdemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>smsdemo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>

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Spring Boot

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.twilio.sdk</groupId>
<artifactId>twilio</artifactId>
<version>7.16.1</version>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}

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Spring Boot

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter')
testCompile('org.springframework.boot:spring-boot-starter-test')
compile group: "com.twilio.sdk", name:"twilio", version: "7.11.+"
}

You can create an executable JAR file, and run the spring boot application by using the
following Maven or Gradle commands:

For Maven, use the command as shown:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Run the JAR file by using the command as given below:

java –jar <JARFILE>

Now, you will receive the SMS to your “to-number”.

Message received to “to-number”.

Sent from your Twilio trail account

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Spring Boot

- Message from Spring Boot Application

Note: In this example, we used the Trail account. So, you should verify the numbers
before sending the SMS.

Voice Calls
To make voice calls by using Twilio, we need to call the Call.creator() method. For this
method, we need to provide a to-number, from-number, and voice-note as shown here.

Call.creator(new PhoneNumber("<to-number>"), new PhoneNumber("<from-number>"),

new
URI("http://demo.twilio.com/docs/voice.xml")).create();

The code for main Spring Boot application class file is given below.

package com.tutorialspoint.smsdemo;
import java.net.URI;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.twilio.Twilio;
import com.twilio.rest.api.v2010.account.Call;
import com.twilio.type.PhoneNumber;
@SpringBootApplication
public class SmsdemoApplication implements ApplicationRunner {

private final static String ACCOUNT_SID = "<ACCOUNT-SID>";

private final static String AUTH_ID = "AUTH-ID";

static {
Twilio.init(ACCOUNT_SID, AUTH_ID);
}

public static void main(String[] args) {

SpringApplication.run(SmsdemoApplication.class, args);
}

@Override
public void run(ApplicationArguments arg0) throws Exception {

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Spring Boot

Call.creator(new PhoneNumber("<to-number>"), new

PhoneNumber("<from-number>"),
new
URI("http://demo.twilio.com/docs/voice.xml")).create();
}
}

The code for complete build configuration file is given below:

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>smsdemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>smsdemo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

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Spring Boot

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.twilio.sdk</groupId>
<artifactId>twilio</artifactId>
<version>7.16.1</version>
</dependency>

</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

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Spring Boot

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

For Maven, use the command as shown:

260
Spring Boot

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command given here:

java –jar <JARFILE>

Now, you will receive call to your “to-number” from Twilio.

Press any key after attending the call, you will hear the voice note from
https://demo.twilio.com/docs/voice.xml

Note: In this example, we used the Trail account. So, you should verify the numbers
before making calls.

261
43. Spring Boot – Unit Test Cases Spring Boot

Unit Testing is a one of the testing done by the developers to make sure individual unit or
component functionalities are working fine.

In this tutorial, we are going to see how to write a unit test case by using Mockito and
Web Controller.

Mockito
For injecting Mockito Mocks into Spring Beans, we need to add the Mockito-core
dependency in our build configuration file.

Maven users can add the following dependency in your pom.xml file.

<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>2.13.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

Gradle users can add the following dependency in the build.gradle file.

compile group: 'org.mockito', name: 'mockito-core', version: '2.13.0'

testCompile('org.springframework.boot:spring-boot-starter-test')

The code to write a Service class which contains a method that returns the String value is
given here.

package com.tutorialspoint.mockitodemo;
import org.springframework.stereotype.Service;
@Service
public class ProductService {
public String getProductName() {
return "Honey";
} }

Now, inject the ProductService class into another Service class file as shown.

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Spring Boot

package com.tutorialspoint.mockitodemo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class OrderService {

@Autowired
ProductService productService;

public OrderService(ProductService productService) {

this.productService = productService;
}

public String getProductName() {

return productService.getProductName();
}
}

The main Spring Boot application class file is given below:

package com.tutorialspoint.mockitodemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MockitoDemoApplication {

public static void main(String[] args) {

SpringApplication.run(MockitoDemoApplication.class, args);
}
}

Then, configure the Application context for the tests. The @Profile(“test”) annotation is
used to configure the class when the Test cases are running.

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Spring Boot

package com.tutorialspoint.mockitodemo;
import org.mockito.Mockito;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Profile;
@Profile("test")
@Configuration
public class ProductServiceTestConfiguration {
@Bean
@Primary
public ProductService productService() {
return Mockito.mock(ProductService.class);
}
}

Now, you can write a Unit Test case for Order Service under the src/test/resources
package.

package com.tutorialspoint.mockitodemo;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mockito;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ActiveProfiles;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@SpringBootTest
@ActiveProfiles("test")
@RunWith(SpringJUnit4ClassRunner.class)
public class MockitoDemoApplicationTests {

@Autowired
private OrderService orderService;

264
Spring Boot

@Autowired
private ProductService productService;

@Test
public void whenUserIdIsProvided_thenRetrievedNameIsCorrect() {
Mockito.when(productService.getProductName()).thenReturn("Mock
Product Name");
String testName = orderService.getProductName();
Assert.assertEquals("Mock Product Name", testName);
}

The complete code for build configuration file is given below.

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>mockito-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>mockito-demo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

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Spring Boot

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-
8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>2.13.0</version>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

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Spring Boot

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter')
compile group: 'org.mockito', name: 'mockito-core', version: '2.13.0'
testCompile('org.springframework.boot:spring-boot-starter-test')
}

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

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Spring Boot

For Maven, you can use the command as shown:

mvn clean install

You can see the test results in console window.

For Gradle, you can use the command as shown:

gradle clean build

You can see the rest results in console window.

268
44. Spring Boot – Rest Controller Unit Test Spring Boot

Spring Boot provides an easy way to write a Unit Test for Rest Controller file. With the
help of SpringJUnit4ClassRunner and MockMvc, we can create a web application context
to write Unit Test for Rest Controller file.

Unit Tests should be written under the src/test/java directory and classpath resources
for writing a test should be placed under the src/test/resources directory.

For Writing a Unit Test, we need to add the Spring Boot Starter Test dependency in your
build configuration file as shown below.

Maven users can add the following dependency in your pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

Gradle users can add the following dependency in your build.gradle file.

testCompile('org.springframework.boot:spring-boot-starter-test')

Before writing a Test case, we should first build RESTful web services. For further
information on building RESTful web services, please refer to the chapter on the same
given in this tutorial.

Writing a Unit Test for REST Controller

In this section , let us see how to write a Unit Test for the REST Controller.

First , we need to create Abstract class file used to create web application context by using
MockMvc and define the mapToJson() and mapFromJson() methods to convert the Java
object into JSON string and convert the JSON string into Java object.

package com.tutorialspoint.demo;
import java.io.IOException;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;

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Spring Boot

import org.springframework.web.context.WebApplicationContext;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = DemoApplication.class)
@WebAppConfiguration
public abstract class AbstractTest {

protected MockMvc mvc;

@Autowired
WebApplicationContext webApplicationContext;

protected void setUp() {

mvc =
MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
}

protected String mapToJson(Object obj) throws JsonProcessingException {

ObjectMapper objectMapper = new ObjectMapper();
return objectMapper.writeValueAsString(obj);
}

protected <T> T mapFromJson(String json, Class<T> clazz)

throws JsonParseException, JsonMappingException, IOException
{
ObjectMapper objectMapper = new ObjectMapper();
return objectMapper.readValue(json, clazz);
}

Next, write a class file that extends the AbstractTest class and write a Unit Test for each
method such GET, POST, PUT and DELETE.

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Spring Boot

The code for GET API Test case is given below. This API is to view the list of products.

@Test
public void getProductsList() throws Exception {
String uri = "/products";
MvcResult mvcResult =
mvc.perform(MockMvcRequestBuilders.get(uri).accept(MediaType.APPLICATION_JSON_V
ALUE)).andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(200, status);
String content = mvcResult.getResponse().getContentAsString();
Product[] productlist = super.mapFromJson(content, Product[].class);
assertTrue(productlist.length > 0);
}

The code for POST API test case is given below. This API is to create a product.

@Test
public void createProduct() throws Exception {
String uri = "/products";
Product product = new Product();
product.setId("3");
product.setName("Ginger");
String inputJson = super.mapToJson(product);
MvcResult mvcResult =
mvc.perform(MockMvcRequestBuilders.post(uri).contentType(MediaType.APPLICATION_
JSON_VALUE).content(inputJson)).andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(201, status);
String content = mvcResult.getResponse().getContentAsString();
assertEquals(content, "Product is created successfully");
}

The code for PUT API Test case is given below. This API is to update the existing product.

@Test
public void updateProduct() throws Exception {
String uri = "/products/2";
Product product = new Product();
product.setName("Lemon");
String inputJson = super.mapToJson(product);

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Spring Boot

MvcResult mvcResult =
mvc.perform(MockMvcRequestBuilders.put(uri).contentType(MediaType.APPLICATION_J
SON_VALUE).content(inputJson)).andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(200, status);
String content = mvcResult.getResponse().getContentAsString();
assertEquals(content, "Product is updated successsfully");
}

The code for Delete API Test case is given below. This API will delete the existing product.

@Test
public void deleteProduct() throws Exception {
String uri = "/products/2";
MvcResult mvcResult =
mvc.perform(MockMvcRequestBuilders.delete(uri)).andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(200, status);
String content = mvcResult.getResponse().getContentAsString();
assertEquals(content, "Product is deleted successsfully");
}

The full Controller Test class file is given below:s

package com.tutorialspoint.demo;

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertTrue;

import org.junit.Before;
import org.junit.Test;
import org.springframework.http.MediaType;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;

import com.tutorialspoint.demo.model.Product;

public class ProductServiceControllerTest extends AbstractTest {

@Override

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Spring Boot

@Before
public void setUp() {
super.setUp();
}

@Test
public void getProductsList() throws Exception {
String uri = "/products";
MvcResult mvcResult =
mvc.perform(MockMvcRequestBuilders.get(uri).accept(MediaType.APPLICATION_JSON_V
ALUE))
.andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(200, status);
String content = mvcResult.getResponse().getContentAsString();
Product[] productlist = super.mapFromJson(content,
Product[].class);
assertTrue(productlist.length > 0);
}

MockMvcRequestBuilders.post(uri).contentType(MediaType.APPLICATION_JSON_VA
LUE).content(inputJson))
.andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(201, status);
String content = mvcResult.getResponse().getContentAsString();
assertEquals(content, "Product is created successfully");
}

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Spring Boot

@Test
public void updateProduct() throws Exception {
String uri = "/products/2";
Product product = new Product();
product.setName("Lemon");
String inputJson = super.mapToJson(product);
MvcResult mvcResult = mvc.perform(

MockMvcRequestBuilders.put(uri).contentType(MediaType.APPLICATION_JSON_VAL
UE).content(inputJson))
.andReturn();
int status = mvcResult.getResponse().getStatus();
assertEquals(200, status);
String content = mvcResult.getResponse().getContentAsString();
assertEquals(content, "Product is updated successsfully");
}

You can create an executable JAR file, and run the Spring Boot application by using the
Maven or Gradle commands given below:

For Maven, you can use the command given below:

mvn clean install

Now, you can see the test results in console window.

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Spring Boot

For Gradle, you can use the command as shown below:

gradle clean build

You can see the rest results in console window as shown below.

275
45. Spring Boot – Database Handling Spring Boot

Spring Boot provides a very good support to create a DataSource for Database. We need
not write any extra code to create a DataSource in Spring Boot. Just adding the
dependencies and doing the configuration details is enough to create a DataSource and
connect the Database.

In this chapter, we are going to use Spring Boot JDBC driver connection to connect the
database.

First, we need to add the Spring Boot Starter JDBC dependency in our build configuration
file.

Maven users can add the following dependencies in the pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>

Gradle users can add the following dependencies in the build.gradle file.

compile('org.springframework.boot:spring-boot-starter-jdbc')

Connect to H2 database
To connect the H2 database, we need to add the H2 database dependency in our build
configuration file.

For Maven users, add the below dependency in your pom.xml file.

<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>

For Gradle users, add the below dependency in your build.gradle file.

compile('com.h2database:h2')

We need to create the schema.sql file and data.sql file under the classpath
src/main/resources directory to connect the H2 database.

The schema.sql file is given below.

CREATE TABLE PRODUCT (ID INT PRIMARY KEY, PRODUCT_NAME VARCHAR(25));

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Spring Boot

The data.sql file is given below.

INSERT INTO PRODUCT (ID,PRODUCT_NAME) VALUES (1,'Honey');

INSERT INTO PRODUCT (ID,PRODUCT_NAME) VALUES (2,'Almond');

Connect MySQL
To connect the MySQL database, we need to add the MySQL dependency into our build
configuration file.

For Maven users, add the following dependency in your pom.xml file.

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

For Gradle users, add the following dependency in your build.gradle file.

compile('mysql:mysql-connector-java')

Now, create database and tables in MySQL as shown:

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Spring Boot

For properties file users, add the following properties in the application.properties file.

spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/PRODUCTSERVICE?autoreconnect=
true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.testOnBorrow=true
spring.datasource.testWhileIdle=true
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=30000
spring.datasource.validationQuery=SELECT 1
spring.datasource.max-active=15
spring.datasource.max-idle=10
spring.datasource.max-wait=8000

For YAML users, add the following properties in the application.yml file.

spring:
datasource:
driverClassName: com.mysql.jdbc.Driver
url: "jdbc:mysql://localhost:3306/PRODUCTSERVICE?autoreconnect=true"
username: "root"
password: "root"
testOnBorrow: true
testWhileIdle: true
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 30000
validationQuery: SELECT 1
max-active: 15
max-idle: 10
max-wait: 8000

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Spring Boot

Connect Redis
Redis is an open source database used to store the in-memory data structure. To connect
the Redis database in Spring Boot application, we need to add the Redis dependency in
our build configuration file.

Maven users should add the following dependency in your pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-redis</artifactId>
</dependency>

Gradle users should add the following dependency in your build.gradle file.

compile('org.springframework.boot:spring-boot-starter-data-redis')

For Redis connection, we need to use RedisTemplate. For RedisTemplate we need to

provide the JedisConnectionFactory details.

@Bean
JedisConnectionFactory jedisConnectionFactory() {
JedisConnectionFactory jedisConFactory = new
JedisConnectionFactory();
jedisConFactory.setHostName("localhost");
jedisConFactory.setPort(6000);
jedisConFactory.setUsePool(true);
return jedisConFactory;
}

@Bean
public RedisTemplate<String, Object> redisTemplate() {
RedisTemplate<String, Object> template = new RedisTemplate<>();
template.setConnectionFactory(jedisConnectionFactory());
template.setKeySerializer(new StringRedisSerializer());
template.setHashKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(new StringRedisSerializer());
template.setValueSerializer(new StringRedisSerializer());
return template;
}

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Spring Boot

Now auto wire the RedisTemplate class and access the data from Redis database.

@Autowired
RedisTemplate<String, Object> redis;
Map<Object,Object> datalist =
redis.opsForHash().entries(“Redis_code_index_key”);

JDBCTemplate
To access the Relational Database by using JdbcTemplate in Spring Boot application, we
need to add the Spring Boot Starter JDBC dependency in our build configuration file.

Then, if you @Autowired the JdbcTemplate class, Spring Boot automatically connects the
Database and sets the Datasource for the JdbcTemplate object.

@Autowired
JdbcTemplate jdbcTemplate;
Collection<Map<String, Object>> rows = jdbc.queryForList("SELECT QUERY");

The @Repository annotation should be added into the class file. The @Repository
annotation is used to create database repository for your Spring Boot application.

@Repository
public class ProductServiceDAO {
}

Multiple DataSource
We can keep ‘n’ number Datasources in a single Spring Boot application. The example
given here shows how to create more than 1 data source in Spring Boot application. Now,
add the two data source configuration details in the application properties file.

For properties file users, add the following properties into your application.properties file.

spring.dbProductService.driverClassName=com.mysql.jdbc.Driver
spring.dbProductService.url=jdbc:mysql://localhost:3306/PRODUCTSERVICE?autoreco
nnect=true
spring.dbProductService.username=root
spring.dbProductService.password=root
spring.dbProductService.testOnBorrow=true
spring.dbProductService.testWhileIdle=true
spring.dbProductService.timeBetweenEvictionRunsMillis=60000
spring.dbProductService.minEvictableIdleTimeMillis=30000
spring.dbProductService.validationQuery=SELECT 1
spring.dbProductService.max-active=15

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Spring Boot

spring.dbProductService.max-idle=10
spring.dbProductService.max-wait=8000

spring.dbUserService.driverClassName=com.mysql.jdbc.Driver
spring.dbUserService.url=jdbc:mysql://localhost:3306/USERSERVICE?autoreconnect=
true
spring.dbUserService.username=root
spring.dbUserService.password=root
spring.dbUserService.testOnBorrow=true
spring.dbUserService.testWhileIdle=true
spring.dbUserService.timeBetweenEvictionRunsMillis=60000
spring.dbUserService.minEvictableIdleTimeMillis=30000
spring.dbUserService.validationQuery=SELECT 1
spring.dbUserService.max-active=15
spring.dbUserService.max-idle=10
spring.dbUserService.max-wait=8000

Yaml users should add the following properties in your application.yml file.

spring:
dbProductService:
driverClassName: com.mysql.jdbc.Driver
url: "jdbc:mysql://localhost:3306/PRODUCTSERVICE?autoreconnect=true"
password: "root"
username: "root"
testOnBorrow: true
testWhileIdle: true
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 30000
validationQuery: SELECT 1
max-active: 15
max-idle: 10
max-wait: 8000
dbUserService:
driverClassName: com.mysql.jdbc.Driver
url: "jdbc:mysql://localhost:3306/USERSERVICE?autoreconnect=true"
password: "root"
username: "root"

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Spring Boot

testOnBorrow: true
testWhileIdle: true
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 30000
validationQuery: SELECT 1
max-active: 15
max-idle: 10
max-wait: 8000

Now, create a Configuration class to create a DataSource and JdbcTemplate for multiple
data sources.

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.core.JdbcTemplate;

@Configuration
public class DatabaseConfig {

@Bean(name="dbProductService")
@ConfigurationProperties(prefix="spring.dbProductService")
@Primary
public DataSource createProductServiceDataSource() {
return DataSourceBuilder.create().build();
}

@Bean(name="dbUserService")
@ConfigurationProperties(prefix="spring.dbUserService")
public DataSource createUserServiceDataSource() {
return DataSourceBuilder.create().build();
}

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Spring Boot

@Bean(name="jdbcProductService")
@Autowired
public JdbcTemplate
createJdbcTemplate_ProductService(@Qualifier("dbProductService") DataSource
productServiceDS) {
return new JdbcTemplate(productServiceDS);
}

@Bean(name="jdbcUserService")
@Autowired
public JdbcTemplate
createJdbcTemplate_UserService(@Qualifier("dbUserService") DataSource
userServiceDS) {
return new JdbcTemplate(userServiceDS);
}

Then, auto wire the JDBCTemplate object by using @Qualifier annotation.

@Qualifier("jdbcProductService")
@Autowired
JdbcTemplate jdbcTemplate;

@Qualifier("jdbcUserService")
@Autowired
JdbcTemplate jdbcTemplate;

283
46. Spring Boot – Securing Web Applications Spring Boot

If a Spring Boot Security dependency is added on the classpath, Spring Boot application
automatically requires the Basic Authentication for all HTTP Endpoints. The Endpoint “/”
and “/home” does not require any authentication. All other Endpoints require
authentication.

For adding a Spring Boot Security to your Spring Boot application, we need to add the
Spring Boot Starter Security dependency in our build configuration file.

Maven users can add the following dependency in the pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>

Gradle users can add the following dependency in the build.gradle file.

compile("org.springframework.boot:spring-boot-starter-security")

Securing a Web application

First, create an unsecure web application by using Thymeleaf templates.

Then, create a home.html file under src/main/resources/templates directory.

<p>Click <a th:href="@{/hello}">here</a> to see a greeting.</p>

</body>
</html>

The simple view /hello defined in the HTML file by using Thymeleaf templates.

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Spring Boot

Now, create a hello.html under src/main/resources/templates directory.

Now, we need to setup the Spring MVC – View controller for home and hello views.

For this, create a MVC configuration file that extends WebMvcConfigurerAdapter.

package com.tutorialspoint.websecuritydemo;

import org.springframework.context.annotation.Configuration;
import
org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import
org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

@Configuration
public class MvcConfig extends WebMvcConfigurerAdapter {

@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/home").setViewName("home");
registry.addViewController("/").setViewName("home");
registry.addViewController("/hello").setViewName("hello");
registry.addViewController("/login").setViewName("login");
}

Now, add the Spring Boot Starter security dependency to your build configuration file.

Maven users can add the following dependency in your pom.xml file.

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Spring Boot

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>

Gradle users can add the following dependency in the build.gradle file.

compile("org.springframework.boot:spring-boot-starter-security")

Now, create a Web Security Configuration file, that is used to secure your application to
access the HTTP Endpoints by using basic authentication.

package com.tutorialspoint.websecuritydemo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import
org.springframework.security.config.annotation.authentication.builders.Authenti
cationManagerBuilder;
import
org.springframework.security.config.annotation.web.builders.HttpSecurity;
import
org.springframework.security.config.annotation.web.configuration.WebSecurityCon
figurerAdapter;
import
org.springframework.security.config.annotation.web.configuration.EnableWebSecur
ity;

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http
.authorizeRequests()
.antMatchers("/", "/home").permitAll()
.anyRequest().authenticated()
.and()
.formLogin()
.loginPage("/login")
.permitAll()
.and()

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Spring Boot

.logout()
.permitAll();
}

@Autowired
public void configureGlobal(AuthenticationManagerBuilder auth) throws
Exception {
auth
.inMemoryAuthentication()
.withUser("user").password("password").roles("USER");
}
}

Now, create a login.html file under the src/main/resources directory to allow the user
to access the HTTP Endpoint via login screen.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<title>Spring Security Example </title>
</head>
<body>
<div th:if="${param.error}">
Invalid username and password.
</div>
<div th:if="${param.logout}">
You have been logged out.
</div>
<form th:action="@{/login}" method="post">
<div><label> User Name : <input type="text" name="username"/>
</label></div>
<div><label> Password: <input type="password" name="password"/>
</label></div>
<div><input type="submit" value="Sign In"/></div>
</form>
</body>
</html>

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Spring Boot

Finally, update the hello.html file – to allow the user to Sign-out from the application and
display the current username as shown below:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"
xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<title>Hello World!</title>
</head>
<body>
<h1 th:inline="text">Hello [[${#httpServletRequest.remoteUser}]]!</h1>
<form th:action="@{/logout}" method="post">
<input type="submit" value="Sign Out"/>
</form>
</body>
</html>

The code for main Spring Boot application is given below:

package com.tutorialspoint.websecuritydemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class WebsecurityDemoApplication {

public static void main(String[] args) {

SpringApplication.run(WebsecurityDemoApplication.class, args);
}
}

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Spring Boot

The complete code for build configuration file is given below.

Maven – pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>websecurity-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>websecurity-demo</name>
<description>Demo project for Spring Boot</description>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>

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Spring Boot

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

buildscript {
ext {
springBootVersion = '1.5.9.RELEASE'
}

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Spring Boot

repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter-security')
compile('org.springframework.boot:spring-boot-starter-thymeleaf')
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
testCompile('org.springframework.security:spring-security-test')
}

Now, create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

Maven users can use the command as given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under target directory.

Gradle users can use the command as shown:

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Spring Boot

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command shown below:

java –jar <JARFILE>

Hit the URL http://localhost:8080/ in your web browser. You can see the output as shown.

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Spring Boot

293
47. Spring Boot Security – OAuth2 with JWT Spring Boot

In this chapter, you will learn in detail about Spring Boot Security mechanisms and OAuth2
with JWT.

Authorization Server
Authorization Server is a supreme architectural component for Web API Security. The
Authorization Server acts a centralization authorization point that allows your apps and
HTTP endpoints to identify the features of your application.

Resource Server
Resource Server is an application that provides the access token to the clients to access
the Resource Server HTTP Endpoints. It is collection of libraries which contains the HTTP
Endpoints, static resources, and Dynamic web pages.

OAuth2
OAuth2 is an authorization framework that enables the application Web Security to access
the resources from the client. To build an OAuth2 application, we need to focus on the
Grant Type (Authorization code), Client ID and Client secret.

JWT Token
JWT Token is a JSON Web Token, used to represent the claims secured between two
parties. You can learn more about the JWT token at https://jwt.io/.

Now, we are going to build an OAuth2 application that enables the use of Authorization
Server, Resource Server with the help of a JWT Token.

You can use the following steps to implement the Spring Boot Security with JWT token by
accessing the database.

First, we need to add the following dependencies in our build configuration file.

Maven users can add the following dependencies in your pom.xml file.

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>

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Spring Boot

</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security.oauth</groupId>
<artifactId>spring-security-oauth2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-jwt</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>

Gradle users can add the following dependencies in the build.gradle file.

compile('org.springframework.boot:spring-boot-starter-security')
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
testCompile('org.springframework.security:spring-security-test')
compile("org.springframework.security.oauth:spring-security-oauth2")
compile('org.springframework.security:spring-security-jwt')
compile("org.springframework.boot:spring-boot-starter-jdbc")
compile("com.h2database:h2:1.4.191")

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Spring Boot

where,

 Spring Boot Starter Security – Implements the Spring Security

 Spring Security OAuth2 – Implements the OAUTH2 structure to enable the

Authorization Server and Resource Server.

 Spring Security JWT – Generates the JWT Token for Web security

 Spring Boot Starter JDBC – Accesses the database to ensure the user is available
or not.

 Spring Boot Starter Web – Writes HTTP endpoints.

 H2 Database – Stores the user information for authentication and authorization.

The complete build configuration file is given below.

<?xml version="1.0" encoding="UTF-8"?>

<groupId>com.tutorialspoint</groupId>
<artifactId>websecurityapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>websecurityapp</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath /> 
</parent>

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Spring Boot

<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security.oauth</groupId>
<artifactId>spring-security-oauth2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-jwt</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>

297
Spring Boot

</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

Gradle – build.gradle

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {

298
Spring Boot

mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-security')
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
testCompile('org.springframework.security:spring-security-test')
compile("org.springframework.security.oauth:spring-security-oauth2")
compile('org.springframework.security:spring-security-jwt')
compile("org.springframework.boot:spring-boot-starter-jdbc")
compile("com.h2database:h2:1.4.191")
}

Now, in the main Spring Boot application, add the @EnableAuthorizationServer and
@EnableResourceServer annotation to act as an Auth server and Resource Server in the
same application.

Also, you can use the following code to write a simple HTTP endpoint to access the API
with Spring Security by using JWT Token.

package com.tutorialspoint.websecurityapp;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import
org.springframework.security.oauth2.config.annotation.web.configuration.EnableA
uthorizationServer;
import
org.springframework.security.oauth2.config.annotation.web.configuration.EnableR
esourceServer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@SpringBootApplication
@EnableAuthorizationServer
@EnableResourceServer
@RestController
public class WebsecurityappApplication {
public static void main(String[] args) {
SpringApplication.run(WebsecurityappApplication.class, args);
}
@RequestMapping(value = "/products")
public String getProductName() {

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Spring Boot

return "Honey"; }}

Use the following code to define the POJO class to store the User information for
authentication.

package com.tutorialspoint.websecurityapp;
import java.util.ArrayList;
import java.util.Collection;
import org.springframework.security.core.GrantedAuthority;
public class UserEntity {
private String username;
private String password;
private Collection<GrantedAuthority> grantedAuthoritiesList = new
ArrayList<>();
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

public Collection<GrantedAuthority> getGrantedAuthoritiesList() {

return grantedAuthoritiesList;
}
public void setGrantedAuthoritiesList(Collection<GrantedAuthority>
grantedAuthoritiesList) {
this.grantedAuthoritiesList = grantedAuthoritiesList;
}
public String getUsername() {
return username;
}

public void setUsername(String username) {

this.username = username;
}
}

Now, use the following code and define the CustomUser class that extends the
org.springframework.security.core.userdetails.User class for Spring Boot authentication.

300
Spring Boot

package com.tutorialspoint.websecurityapp;

import org.springframework.security.core.userdetails.User;

public class CustomUser extends User {

private static final long serialVersionUID = 1L;

public CustomUser(UserEntity user) {

super(user.getUsername(), user.getPassword(),
user.getGrantedAuthoritiesList());
}
}

You can create the @Repository class to read the User information from the database and
send it to the Custom user service and also add the granted authority
“ROLE_SYSTEMADMIN”.

package com.tutorialspoint.websecurityapp;

import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.stereotype.Repository;

@Repository
public class OAuthDao {

@Autowired
private JdbcTemplate jdbcTemplate;

public UserEntity getUserDetails(String username) {

301
Spring Boot

Collection<GrantedAuthority> grantedAuthoritiesList = new

ArrayList<>();

String userSQLQuery = "SELECT * FROM USERS WHERE USERNAME=?";

List<UserEntity> list = jdbcTemplate.query(userSQLQuery, new
String[] { username },
(ResultSet rs, int rowNum) -> {
UserEntity user = new UserEntity();
user.setUsername(username);
user.setPassword(rs.getString("PASSWORD"));
return user;
});
if (list.size() > 0) {
GrantedAuthority grantedAuthority = new
SimpleGrantedAuthority("ROLE_SYSTEMADMIN");
grantedAuthoritiesList.add(grantedAuthority);

list.get(0).setGrantedAuthoritiesList(grantedAuthoritiesList);
return list.get(0);
}
return null;
}
}

You can create a Custom User detail service class that extends the
org.springframework.security.core.userdetails.UserDetailsService to call the DAO
repository class as shown.

package com.tutorialspoint.websecurityapp;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

@Service
public class CustomDetailsService implements UserDetailsService {

@Autowired
OAuthDao oauthDao;

302
Spring Boot

@Override
public CustomUser loadUserByUsername(final String username) throws
UsernameNotFoundException {
UserEntity userEntity = null;
try {
userEntity = oauthDao.getUserDetails(username);
CustomUser customUser = new CustomUser(userEntity);
return customUser;
} catch (Exception e) {
e.printStackTrace();
throw new UsernameNotFoundException("User " + username + "
was not found in the database");
}
}
}

Next, create a @configuration class to enable the Web Security, defining the Password
encoder (BCryptPasswordEncoder), and defining the AuthenticationManager bean. The
Security configuration class should extend WebSecurityConfigurerAdapter class.

package com.tutorialspoint.websecurityapp;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import
org.springframework.security.config.annotation.authentication.builders.Authenti
cationManagerBuilder;
import
org.springframework.security.config.annotation.method.configuration.EnableGloba
lMethodSecurity;
import
org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import
org.springframework.security.config.annotation.web.configuration.EnableWebSecur
ity;
import
org.springframework.security.config.annotation.web.configuration.WebSecurityCon
figurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;

303
Spring Boot

import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {

@Autowired
private CustomDetailsService customDetailsService;

@Bean
public PasswordEncoder encoder() {
return new BCryptPasswordEncoder();
}

@Override
@Autowired
protected void configure(AuthenticationManagerBuilder auth) throws
Exception {

auth.userDetailsService(customDetailsService).passwordEncoder(encoder());
}

@Override
protected void configure(HttpSecurity http) throws Exception {

http.authorizeRequests().anyRequest().authenticated().and().sessionManagem
ent()
.sessionCreationPolicy(SessionCreationPolicy.NEVER);
}

@Override
public void configure(WebSecurity web) throws Exception {
web.ignoring();

304
Spring Boot

@Override
@Bean
public AuthenticationManager authenticationManagerBean() throws Exception
{
return super.authenticationManagerBean();
}
}

Now, define the OAuth2 Configuration class to add the Client ID, Client Secret, Define the
JwtAccessTokenConverter, Private key and Public key for token signer key and verifier
key, and configure the ClientDetailsServiceConfigurer for the Token validity with scopes.

package com.tutorialspoint.websecurityapp;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import
org.springframework.security.oauth2.config.annotation.configurers.ClientDetails
ServiceConfigurer;
import
org.springframework.security.oauth2.config.annotation.web.configuration.Authori
zationServerConfigurerAdapter;
import
org.springframework.security.oauth2.config.annotation.web.configurers.Authoriza
tionServerEndpointsConfigurer;
import
org.springframework.security.oauth2.config.annotation.web.configurers.Authoriza
tionServerSecurityConfigurer;
import
org.springframework.security.oauth2.provider.token.store.JwtAccessTokenConverte
r;
import org.springframework.security.oauth2.provider.token.store.JwtTokenStore;

@Configuration
public class OAuth2Config extends AuthorizationServerConfigurerAdapter {

private String clientid = "tutorialspoint";

private String clientSecret = "my-secret-key";

305
Spring Boot

private String privateKey = "private key";

private String publicKey = "public key";

@Autowired
@Qualifier("authenticationManagerBean")
private AuthenticationManager authenticationManager;

@Bean
public JwtAccessTokenConverter tokenEnhancer() {
JwtAccessTokenConverter converter = new JwtAccessTokenConverter();
converter.setSigningKey(privateKey);
converter.setVerifierKey(publicKey);
return converter;
}

@Bean
public JwtTokenStore tokenStore() {
return new JwtTokenStore(tokenEnhancer());
}

@Override
public void configure(AuthorizationServerEndpointsConfigurer endpoints)
throws Exception {

endpoints.authenticationManager(authenticationManager).tokenStore(tokenSto
re())
.accessTokenConverter(tokenEnhancer());
}

@Override
public void configure(AuthorizationServerSecurityConfigurer security)
throws Exception {

security.tokenKeyAccess("permitAll()").checkTokenAccess("isAuthenticated()
");
}

@Override

306
Spring Boot

public void configure(ClientDetailsServiceConfigurer clients) throws

Exception {

clients.inMemory().withClient(clientid).secret(clientSecret).scopes("read"
, "write")
.authorizedGrantTypes("password",
"refresh_token").accessTokenValiditySeconds(20000)
.refreshTokenValiditySeconds(20000);

}
}

Now, create a Private key and public key by using openssl.

You can use the following commands for generating private key.

openssl genrsa -out jwt.pem 2048

openssl rsa -in jwt.pem

You can use For public key generation use the below commands.

openssl rsa -in jwt.pem -pubout

For the version of Spring Boot latter than 1.5 release, add the below property in your
application.properties file to define OAuth2 Resource filter order.

security.oauth2.resource.filter-order=3

YAML file users can add the below property in YAML file.

security:
oauth2:
resource:
filter-order: 3

Now, create schema.sql and data.sql file under the classpath resources
src/main/resources/ directory to connect the application to H2 database.

The schema.sql file is as shown:

CREATE TABLE USERS (ID INT PRIMARY KEY, USERNAME VARCHAR(45), PASSWORD
VARCHAR(60));

The data.sql file is as shown:

307
Spring Boot

INSERT INTO USERS (ID, USERNAME,PASSWORD) VALUES (1,

'tutorialspoint@gmail.com','$2a$08$fL7u5xcvsZl78su29x1ti.dxI.9rYO8t0q5wk2ROJ.1c
dR53bmaVG');

INSERT INTO USERS (ID, USERNAME,PASSWORD) VALUES (2,

'myemail@gmail.com','$2a$08$fL7u5xcvsZl78su29x1ti.dxI.9rYO8t0q5wk2ROJ.1cdR53bma
VG');

Note: Password should be stored in the format of Bcrypt Encoder in the database table.

You can create an executable JAR file, and run the Spring Boot application by using the
following Maven or Gradle commands.

For Maven, you can use the command given below:

mvn clean install

After “BUILD SUCCESS”, you can find the JAR file under the target directory.

For Gradle, you can use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

Now, run the JAR file by using the command shown here:

java –jar <JARFILE>

The application is started on the Tomcat port 8080.

Now hit the POST method URL via POSTMAN to get the OAUTH2 token

http://localhost:8080/oauth/token

Now, add the Request Headers as follows:

 Authorization – Basic Auth with your Client Id and Client secret.

 Content Type - application/x-www-form-urlencoded

Now , add the Request Parameters as follows:

308
Spring Boot

 grant_type = password
 username = your username
 password = your password

Now, hit the API and get the access_token as shown:

Now, Hit the Resource Server API with Bearer access token in Request Header as shown.

309
Spring Boot

Then you can see the output as shown below:

310
48. Spring Boot – Google Cloud Platform Spring Boot

Google Cloud Platform provides a cloud computing services that run the Spring Boot
application in the cloud environment. In this chapter, we are going to see how to deploy
the Spring Boot application in GCP app engine platform.

First, download the Gradle build Spring Boot application from Spring Initializer page
http://start.spring.io/. Observe the following screenshot.

Now, in build.gradle file, add the Google Cloud appengine plugin and appengine classpath
dependency.

The code for build.gradle file is given below:

311
Spring Boot

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'com.google.cloud.tools.appengine'

group = 'com.tutorialspoint'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

Now, write a simple HTTP Endpoint and it returns the String success as shown:

package com.tutorialspoint.appenginedemo;

@SpringBootApplication
@RestController
public class AppengineDemoApplication {

public static void main(String[] args) {

SpringApplication.run(AppengineDemoApplication.class, args);
}

@RequestMapping(value="/")
public String success() {

312
Spring Boot

return "APP Engine deployment success";

}
}

Next, add the app.yml file under src/main/appengine directory as shown:

runtime: java
env: flex

handlers:
- url: /.*
script: this field is required, but ignored

Now, go to the Google Cloud console and click the Activate Google cloud shell at the top
of the page.

Now, move your source files and Gradle file into home directory of your google cloud
machine by using google cloud shell.

Now, execute the command gradle appengineDeploy and it will deploy your application
into the Google Cloud appengine.

Note: GCP should be billing enabled and before deploying your application into appengine,
you should create appengine platform in GCP.

It will take few minutes to deploy your application into GCP appengine platform.

After build successful you can see the Service URL in console window.

313
Spring Boot

Now, hit the service URL and see the output.

Google Cloud SQL

To connect the Google Cloud SQL into your Spring Boot application, you should add the
following properties into your application.properties file.

JDBC URL Format

jdbc:mysql://google/<DATABASE-
NAME>?cloudSqlInstance=<GOOGLE_CLOUD_SQL_INSTANCE_NAME>
&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=<USERNAME>&passwor
d=<PASSWORD>

Note: The Spring Boot application and Google Cloud SQL should be in same GCP project.

The application.properties file is given below.

spring.dbProductService.driverClassName=com.mysql.jdbc.Driver
spring.dbProductService.url=jdbc:mysql://google/PRODUCTSERVICE?cloudSqlInstance
=springboot-gcp-cloudsql:asia-northeast1:springboot-gcp-cloudsql-
instance&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=root&passw
ord=rootspring.dbProductService.username=root
spring.dbProductService.password=root
spring.dbProductService.testOnBorrow=true
spring.dbProductService.testWhileIdle=true
spring.dbProductService.timeBetweenEvictionRunsMillis=60000
spring.dbProductService.minEvictableIdleTimeMillis=30000
spring.dbProductService.validationQuery=SELECT 1
spring.dbProductService.max-active=15
spring.dbProductService.max-idle=10
spring.dbProductService.max-wait=8000

YAML file users can add the below properties to your application.yml file.

spring:
datasource:
driverClassName: com.mysql.jdbc.Driver
url: "jdbc:mysql://google/PRODUCTSERVICE?cloudSqlInstance=springboot-gcp-
cloudsql:asia-northeast1:springboot-gcp-cloudsql-
instance&socketFactory=com.google.cloud.sql.mysql.SocketFactory&user=root&passw
ord=root"

314
Spring Boot

password: "root"
username: "root"
testOnBorrow: true
testWhileIdle: true
validationQuery: SELECT 1
max-active: 15
max-idle: 10
max-wait: 8000

315
49. Spring Boot – Google OAuth2 Sign-In Spring Boot

In this chapter, we are going to see how to add the Google OAuth2 Sign-In by using Spring
Boot application with Gradle build.

First, add the Spring Boot OAuth2 security dependency in your build configuration file and
your build configuration file is given below.

buildscript {
ext {
springBootVersion = '1.5.8.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-
plugin:${springBootVersion}")
}
}

apply plugin: 'java'

apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

group = 'com.tutorialspoint.projects'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile('org.springframework.boot:spring-boot-starter')
testCompile('org.springframework.boot:spring-boot-starter-test')

316
Spring Boot

compile('org.springframework.security.oauth:spring-security-oauth2')
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
}

Now, add the HTTP Endpoint to read the User Principal from the Google after authenticating
via Spring Boot in main Spring Boot application class file as given below:

package com.tutorialspoint.projects.googleservice;

import java.security.Principal;

@SpringBootApplication
@RestController
public class GoogleserviceApplication {

public static void main(String[] args) {

SpringApplication.run(GoogleserviceApplication.class, args);
}

@RequestMapping(value="/user")
public Principal user(Principal principal) {
return principal;
}
}

Now, write a Configuration file to enable the OAuth2SSO for web security and remove the
authentication for index.html file as shown:

package com.tutorialspoint.projects.googleservice;
import
org.springframework.boot.autoconfigure.security.oauth2.client.EnableOAuth2Sso;
import org.springframework.context.annotation.Configuration;
import
org.springframework.security.config.annotation.web.builders.HttpSecurity;

317
Spring Boot

import
org.springframework.security.config.annotation.web.configuration.WebSecurityCon
figurerAdapter;
@Configuration
@EnableOAuth2Sso
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {

@Override
protected void configure(HttpSecurity http) throws Exception {
http
.csrf()
.disable()
.antMatcher("/**")
.authorizeRequests()
.antMatchers("/", "/index.html")
.permitAll()
.anyRequest()
.authenticated();
}
}

Next, add the index.html file under static resources and add the link to redirect into user
HTTP Endpoint to read the Google user Principal as shown below:

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="user">Click here to Google Login</a>
</body>
</html>

Note: In Google Cloud console - Enable the Gmail Services, Analytics Services and
Google+ service API(s).

Then, go the Credentials section and create a credentials and choose OAuth Client ID.

318
Spring Boot

Next, provide a Product Name in OAuth2 consent screen.

319
Spring Boot

Next, choose the Application Type as “Web application”, provide the Authorized JavaScript
origins and Authorized redirect URIs.

320
Spring Boot

Now, your OAuth2 Client Id and Client Secret is created.

Next, add the Client Id and Client Secret in your application properties file.

security.oauth2.client.clientId=<CLIENT_ID>
security.oauth2.client.clientSecret=<CLIENT_SECRET>
security.oauth2.client.accessTokenUri=https://www.googleapis.com/oauth2/v3/toke
n
security.oauth2.client.userAuthorizationUri=https://accounts.google.com/o/oauth
2/auth
security.oauth2.client.tokenName=oauth_token
security.oauth2.client.authenticationScheme=query
security.oauth2.client.clientAuthenticationScheme=form
security.oauth2.client.scope=profile email

security.oauth2.resource.userInfoUri=https://www.googleapis.com/userinfo/v2/me
security.oauth2.resource.preferTokenInfo=false

Now, you can create an executable JAR file, and run the Spring Boot application by using
the following Gradle command.

For Gradle, you can use the command as shown:

gradle clean build

After “BUILD SUCCESSFUL”, you can find the JAR file under the build/libs directory.

321
Spring Boot

Run the JAR file by using the command java –jar <JARFILE> and application is started on
the Tomcat port 8080.

Now hit the URL http://localhost:8080/ and click the Google Login link.

It will redirect to the Google login screen and provide a Gmail login details.

322
Spring Boot

If login success, we will receive the Principal object of the Gmail user.

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