Spring Applications

Exercise: Chat Application (Basic Messaging)

1. Run the ActiveMQ message broker:

docker run --name activemq -d --rm -p 61616:61616 -p 8161:8161
           apache/activemq-classic

2. Create a Spring application with the starter spring-boot-starter-activemq as dependency.
3. Define application properties that provide the URL of the ActiveMQ message broker and enable the publish-subscribe domain:

spring.activemq.broker-url=tcp://localhost:61616
spring.jms.pub-sub-domain=true

4. Implement a publisher and a listener component that allow a user to send text messages to and receive text messages from the topic ChatTopic.
5. Add a property user to the messages that identifies the sender of the message and display it.
6. Define a message selector such that the sender's own messages are not received.

Solution