Coding the Message-Driven Bean: ReplyMsgBean.java

The message-driven bean class, replybean/src/ReplyMsgBean.java, does the following:

1. Uses the @MessageDriven annotation:

   @MessageDriven(mappedName="jms/Topic")

2. Injects resources for the MessageDrivenContext and for a connection factory. It does not need a destination resource because it uses the value of the incoming message’s JMSReplyTo header as the destination.

3. Uses a @PostConstruct callback method to create the connection, and a @PreDestroy callback method to close the connection.

The onMessage method of the message-driven bean class does the following:

1. Casts the incoming message to a TextMessage and displays the text

2. Creates a connection, a session, and a publisher for the reply message

3. Publishes the message to the reply topic

4. Closes the connection

On both servers, the bean will consume messages from the topic jms/Topic.