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Spring s JmsTemplate greatly simplifies common JMS tasks like sending messages by automating generic code. Using JmsTemplate, our entire message producer code could be reduced to a few lines. This is a great way to take care of tasks, as long as you aren t doing anything too complicated such as using temporary queues, JMS headers, and properties. At the time of this writing, Spring doesn t have very robust asynchronous messageprocessing capabilities when compared to MDB. Any future MDB-like features in Spring are likely to utilize the relatively arcane JCA container, which leaves room for a great Spring/EJB 3 integration case.
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We just finished reviewing most of the major parts of JMS that you need to send and use with MDB. While full coverage of JMS is beyond the scope of this chapter, we encourage you to fully explore the fascinating JMS API by visiting http:// java.sun.com/products/jms/docs.html. In particular, you should explore how JMS message consumers work. Having taken a closer look at JMS messages, the time is right to look at the Turtle server message consumer, which we ll build using an MDB.
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4.3 Working with message-driven beans
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We ll now build on our brief coverage of MDBs in chapters 1 and 2 and explore MDBs in detail, why you should consider using them, and how to develop them. We ll also discuss some best practices as well as pitfalls to avoid when developing MDBs. Message-driven beans are EJB components designed to consume the asynchronous messages we ve been discussing. Although MDBs are intended to handle
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Messaging and developing MDBs
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many different kinds of messages (see the sidebar JCA Connectors and Messaging ), we ll primarily focus on MDBs that process JMS messages because most enterprise applications use JMS. From this perspective, you might ask why we d need to employ EJBs to handle the task of consuming messages at all when we could use the code we just developed for the JMS message consumer. We ll address this question next. We ll develop a simple message consumer application using MDBs and show you how to use the @MessageDriven annotation. You ll also learn more about the MessageListener interface, activation configuration properties, and the MDB lifecycle.
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JCA connectors and messaging
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Although by far JMS is the primary messaging provider for MDBs, as of EJB 2.1 it is not the only one. Thanks to the Java EE Connector Architecture (JCA), MDBs can receive messages from any enterprise information system (EIS), such as PeopleSoft HR or Oracle Manufacturing, not just MOMs that support JMS. Suppose you have a legacy application that needs to send messages to an MDB. You can do this by implementing a JCA-compliant adapter/connector that includes support for message inflow contract. Once your JCA resource adapter or connector is deployed to a Java EE container, you can use the message inflow contract to have an asynchronous message delivered to an endpoint inside the container. A JCA endpoint is essentially the same as a JMS destination it acts as a server proxy to an MDB (a message consumer/listener in JMS terms). As soon as a message arrives at the endpoint, the container triggers any registered MDBs listening to the endpoint and delivers the message to it. For its part, the MDB implements a listener interface that is appropriate to the JCA connector/message type and passes activation configuration parameters to the JCA connector and registers as a listener to the JCA connector (we ll discuss message listeners and activation configuration parameters shortly). JCA also enables MOM providers to integrate with Java EE containers in a standardized manner using a JCA-compliant connector or resource adapter. For more information on JCA, visit http://java.sun.com/j2ee/connector/index.jsp.
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4.3.1 Why use MDBs
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Given the less-than-stellar reputation of EJB 2, you might question the value of EJB 3 MDBs. The truth is, MDBs have enjoyed a reasonable degree of success even in the darkest hours of EJB. In this section, we ll explain why you should take a serious look at MDBs.
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