Spring Boot with RabbitMQ Using Docker Compose: A Step-by-Step Tutorial

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Docker Compose is a powerful tool that allows you to define and run multi-container Docker applications. In this tutorial, we will set up a Spring Boot application that interacts with RabbitMQ using Docker Compose. This will enable us to run RabbitMQ and our Spring Boot application in separate containers.

Prerequisites

• JDK 17 or later
• Maven
• Docker and Docker Compose installed on your machine
• IDE (IntelliJ IDEA, Eclipse, etc.)

Step 1: Set Up a Spring Boot Project

Use Spring Initializr to create a new project with the following configuration:

• Project: Maven Project
• Language: Java
• Spring Boot: 3.2.x
• Dependencies: Spring Web, Spring AMQP, Spring Boot Starter for RabbitMQ

Download and unzip the project, then open it in your IDE.

Example Spring Boot Application

Create a simple Spring Boot application that interacts with RabbitMQ.

1.1 Application Class

package com.example.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); } } 

1.2 RabbitMQ Configuration

Create a configuration class for RabbitMQ in the com.example.demo.config package.

package com.example.demo.config; import org.springframework.amqp.core.Queue; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class RabbitMQConfig { public static final String QUEUE_NAME = "test_queue"; @Bean public Queue queue() { return new Queue(QUEUE_NAME, false); } } 

1.3 RabbitMQ Producer Service

Create a service class for the RabbitMQ producer in the com.example.demo.service package.

package com.example.demo.service; import org.springframework.amqp.rabbit.core.RabbitTemplate; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; @Service public class RabbitMQProducerService { @Autowired private RabbitTemplate rabbitTemplate; private static final String QUEUE_NAME = "test_queue"; public void sendMessage(String message) { rabbitTemplate.convertAndSend(QUEUE_NAME, message); } } 

1.4 RabbitMQ Consumer Service

Create a service class for the RabbitMQ consumer in the com.example.demo.service package.

package com.example.demo.service; import org.springframework.amqp.rabbit.annotation.RabbitListener; import org.springframework.stereotype.Service; @Service public class RabbitMQConsumerService { @RabbitListener(queues = RabbitMQConfig.QUEUE_NAME) public void receiveMessage(String message) { System.out.println("Received message: " + message); } } 

1.5 REST Controller

Create a MessageController class in the com.example.demo.controller package to send messages to RabbitMQ.

package com.example.demo.controller; import com.example.demo.service.RabbitMQProducerService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; @RestController public class MessageController { @Autowired private RabbitMQProducerService rabbitMQProducerService; @PostMapping("/send") public String sendMessage(@RequestParam("message") String message) { rabbitMQProducerService.sendMessage(message); return "Message sent to RabbitMQ successfully"; } } 

1.6 application.properties Configuration

Configure your application to use RabbitMQ. In the src/main/resources directory, create or update the application.properties file.

# src/main/resources/application.properties spring.rabbitmq.host=localhost spring.rabbitmq.port=5672 spring.rabbitmq.username=guest spring.rabbitmq.password=guest 

Step 2: Create Docker Compose Configuration

Docker Compose allows you to define and run multi-container Docker applications. You will create a docker-compose.yml file to define the services for your Spring Boot application and RabbitMQ.

2.1 Create docker-compose.yml

Create a docker-compose.yml file in the root directory of your project.

version: '3.8' services: rabbitmq: image: rabbitmq:3-management ports: - "5672:5672" - "15672:15672" volumes: - rabbitmq_data:/var/lib/rabbitmq app: image: demo-app build: context: . dockerfile: Dockerfile ports: - "8080:8080" environment: SPRING_RABBITMQ_HOST: rabbitmq SPRING_RABBITMQ_PORT: 5672 SPRING_RABBITMQ_USERNAME: guest SPRING_RABBITMQ_PASSWORD: guest depends_on: - rabbitmq volumes: rabbitmq_data: 

Explanation:

• rabbitmq: Defines the RabbitMQ service.
  • image: Specifies the Docker image to use.
  • ports: Maps the container ports to the host ports.
  • volumes: Persists the RabbitMQ data.
• app: Defines the Spring Boot application service.
  • depends_on: Ensures the RabbitMQ service is started before the Spring Boot application.
  • environment: Sets the RabbitMQ host, port, username, and password for the Spring Boot application.

2.2 Create a Dockerfile

Create a Dockerfile in the root directory of your project.

# Use the official OpenJDK base image FROM openjdk:17-jdk-alpine # Set the working directory inside the container WORKDIR /app # Copy the built jar file into the container COPY target/demo-0.0.1-SNAPSHOT.jar app.jar # Expose port 8080 EXPOSE 8080 # Run the application ENTRYPOINT ["java", "-jar", "app.jar"] 

Step 3: Build and Run the Application

3.1 Build the Jar File

Run the following command to build the jar file of your Spring Boot application:

./mvnw clean package 

3.2 Build and Run Docker Compose

Run the following command to build and start the Docker Compose services:

docker-compose up --build 

3.3 Verify the Application

Open a web browser or a tool like Postman and navigate to the following URL to test the endpoints:

1. Send a message to RabbitMQ:
   • URL: http://localhost:8080/send?message=HelloRabbitMQ
   • Method: POST

Check the console output to see the consumed message:

Received message: HelloRabbitMQ 

Conclusion

In this tutorial, you have learned how to set up and run a Spring Boot application with RabbitMQ using Docker Compose. We covered:

• Setting up a Spring Boot project with RabbitMQ.
• Creating RabbitMQ producer and consumer services.
• Creating a REST controller to send messages to RabbitMQ.
• Creating a Dockerfile for the Spring Boot application.
• Creating a docker-compose.yml file to define the services.
• Building and running the application using Docker Compose.

By following these steps, you can easily manage and deploy your Spring Boot application and its dependencies using Docker Compose, enabling seamless interaction with RabbitMQ.