Spring Boot Groovy Thymeleaf Example Tutorial

In this tutorial, you will learn how to develop a simple Spring Boot web application using Groovy, Spring Data JPA, and Thymeleaf.

1. Creating Spring Boot Project

You can create a Spring Boot application using Groovy either from the IDE or using the online Spring Boot application generator http://start.spring.io and selecting Groovy as the language.

2. Add Maven Dependencies

Add the Web, Thymeleaf, JPA, and H2 starters dependencies to your application:
<?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>net.javaguides</groupId> <artifactId>springboot-groovy-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot-groovy-demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.0.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </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-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-rest</artifactId> </dependency> <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> <dependency> <groupId>org.codehaus.groovy</groupId> <artifactId>groovy</artifactId> </dependency> <dependency> <groupId>com.h2database</groupId> <artifactId>h2</artifactId> <scope>runtime</scope> </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>

3. User.groovy

Let's create a JPA entity called User.groovy and add the following content to it:
import javax.persistence.* @Entity @Table(name = "users") class User { @Id @GeneratedValue(strategy = GenerationType.AUTO) Long id String name String email }
As you are using Groovy, you don’t need to create setters and getters for your entity properties.

4. UserRepository.groovy

Create a Spring Data JPA repository for the User entity:
import org.springframework.data.jpa.repository.JpaRepository interface UserRepository extends JpaRepository<User, Long> { User findByEmail(String email); }

5. HomeController.groovy

Let's create a SpringMVC controller to show the list of users:
import org.springframework.beans.factory.annotation.Autowired import org.springframework.stereotype.Controller import org.springframework.ui.Model import org.springframework.web.bind.annotation.GetMapping @Controller class HomeController { @Autowired UserRepository repo; @GetMapping("/") String home(Model model) { model.addAttribute("users", repo.findAll()) "home" } }

6. src/main/resources/templates/home.html

Create the Thymeleaf view home.html to render users:
<!DOCTYPE HTML> <html xmlns:th="http://www.thymeleaf.org"> <head> <title>Users List</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body> <table> <thead> <tr> <th>Id</th> <th>Name</th> </tr> </thead> <tbody> <tr th:each="user : ${users}"> <td th:text="${user.id}">Id</td> <td th:text="${user.name}">Name</td> </tr> </tbody> </table> </body> </html>

7. src/main/resources/data.sql

Initialize the database with sample data using a SQL script:
insert into users(id, name, email) values (1,'admin','admin@gmail.com'), (2,'john','john@gmail.com'), (3,'test','test@gmail.com');

8. SpringbootGroovyDemoApplication.groovy

When you generate the application, the main entry point class is created:
import org.springframework.boot.SpringApplication import org.springframework.boot.autoconfigure.SpringBootApplication @SpringBootApplication class SpringbootGroovyDemoApplication { static void main(String[] args) { SpringApplication.run SpringbootGroovyDemoApplication, args } }

9. Run Spring Boot App

Now you can run the application by executing the SpringbootGroovyDemoApplication.main() method or using the following command:
mvn spring-boot:run or gradle bootRun
If you point your browser to http://localhost:8080/, you should be able to see user details

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