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Although we didn t explicitly show it in our example, there is one more MDB feature you should know about: MDB transaction management. We ll discuss EJB transactions in general in much more detail in the next chapter, so here we ll give you the bargain basement version.

In our plain JMS examples, we specified whether the JMS session would be transactional when we created it. On the other hand, if you look closely at the MDB example it doesn t indicate anything about transactions. Instead, we re letting the container use the default transactional behavior for MDBs. By default, the container will start a transaction before the onMessage method is invoked and will commit the transaction when the method returns, unless the transaction was marked as rollback through the message-driven context. You ll learn more about transactions in chapter 6. This brief discussion of transaction management concludes our analysis of the basic features that MDBs offer. We ve discussed how you can use MDBs to leverage the power of messaging without dealing with the low-level details of the

This recipe separates the actual transaction of the session bean and the JDBC transaction contained within the DAO object. The DAO uses a system exception in order to force the container to roll back the session bean s transaction upon an error in the update. This recipe works for CMT session beans; for BMT beans you could pass a reference to the UserTransaction instance to the DAO object for control. If you were using multiple DAO objects, each of which might possibly need rollbacks, it would be best to use a bean-managed transaction EJB, allowing you finer-grained control.

which was the first prototype of Java Aspect Components (JAC), was implemented. Since then, several versions of AspectJ have been released, and each one has included new features and/or bug fixes. The first major version of AspectJ, designated version 1.0, was released in November 2001. This was also the year during which AOP was fully recognized by the international computer-science community. A special edition of the leading journal, Communications of the ACM, was devoted to AOP. In December 2002, the AspectJ project left PARC and joined the open-source Eclipse community. Since then, the AspectJ Development Tools (AJDT) plug-in has been developed. It enables you to write, compile, and run an aspect-oriented program within the IBM Eclipse IDE.

messaging API. As you ve seen, MDBs provide a host of EJB features for free, such as multithreading, resource injection, lifecycle management, and container-managed transactions. We ve formulated our code samples so that you can use them as templates for solving real business problems. At this point, we ll give you tips for dealing with the nuances of MDBs.

Like all technologies, MDBs have some pitfalls to watch for and some best practices that you should keep in mind This is particularly true in demanding environments where messaging is typically deployed Choose your messaging models carefully Before you wade knee deep in code, consider your choice of messaging model carefully You might find that PTP will solve your problem nine times out of ten In some cases, though, the pub-sub approach is better, especially if you find yourself broadcasting the same message to more than one receiver (such as our system outage notification example) Luckily, most messaging code is domain independent, and you should strive to keep it that way For the most part, switching domains should be just a matter of configuration Remember modularization Because MDBs are so similar to session beans, it is natural to start putting business logic right into message listener methods.

You would like your application client to start a transaction with which to execute EJB methods. In this scenario, you want the client to propagate a transaction to the EJB container. This recipe should only be used with session beans.