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Example Application Overview

This application has the following components:

• SimpleMessageClient: A J2EE application client that sends several messages to a queue.
• SimpleMessageEJB: A message-driven bean that asynchronously receives and processes the messages that are sent to the queue.

Figure 16 illustrates the structure of this application. The application client sends messages to the queue, which was created administratively using the j2eeadmin command. The JMS provider (in this, case the J2EE server) delivers the messages to the instances of the message-driven bean, which then processes the messages.

Figure 7-1 The SimpleMessageApp Application

The source code for this application is in the j2eetutorial/examples/src/ejb/simplemessage directory. To compile the code, go to the j2eetutorial/examples directory and type ant simplemessage. A sample SimpleMessageApp.ear file is in the j2eetutorial/examples/ears directory.

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