Spring Integration: Getting Started - 06 - Message Broker (Java config)

This is a demo project for the Pluralsight course "Spring Integration: Getting Started" by Jesper de Jong.

Demo 6: Splitting the demo into separate frontend and backend applications that use RabbitMQ for messaging.

This is a bonus version of the previous example that uses Java configuration instead of XML configuration.

Using Java configuration is a bit more involved than XML, since Spring Integration's XML namespace handlers do some configuration automatically, that you have to do yourself if you want to use Java configuration. Nevertheless it's an interesting and educational exercise to see how this is done.

See the classes GlobomanticsWebIntegrationConfig and GlobomanticsServiceIntegrationConfig to learn how the Spring Integration components are configured when using Java configuration.

Building

Build the application using one of the following commands:

# macOS or Linux
./mvnw clean install

# Windows
mvnw.cmd clean install

(This will automatically download Apache Maven if necessary).

Running

RabbitMQ

To be able to run this version of the demo, you will need to have RabbitMQ running. An easy way to run RabbitMQ is by using Docker.

To create and start RabbitMQ in a Docker container, use the following command:

docker run -d -h rabbitmq --name rabbitmq -p 5672:5672 -p 15672:15672 rabbitmq:3.7-management-alpine

Some additional Docker commands:

# Check what Docker containers are running
docker ps

# Stop the RabbitMQ container
docker stop rabbitmq

# Delete the RabbitMQ container (deletes all data in the container)
docker rm rabbitmq

When RabbitMQ is running, its management interface is available at: http://localhost:15672

Login with username guest and password guest.

Before starting the demo application, go to "Queues" in the management interface and define a queue named: globomantics.registrationRequest

Frontend and backend

Run the frontend application with one of the following commands:

# macOS or Linux
./mvnw -pl web spring-boot:run

# Windows
mvnw.cmd -pl web spring-boot:run

Or run the class GlobomanticsWebApplication from your IDE.

Run the backend application with one of the following commands:

# macOS or Linux
./mvnw -pl service spring-boot:run

# Windows
mvnw.cmd -pl service spring-boot:run

Or run the class GlobomanticsServiceApplication from your IDE.

When the applications have started, point your browser to: http://localhost:8080

Select a ticket type, fill in the registration form and click the "Register" button.

Then go to the H2 Console at: http://localhost:8081/h2-console

(Note, it's now using port 8081; the frontend occupies port 8080).

Use JDBC URL: jdbc:h2:mem:globomantics, username: sa, and no password to connect to the in-memory H2 database.

You will see records in the tables ATTENDEES and ATTENDEE_TICKETS.