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saveState(); } public void afterCompletion( boolean committed ) throws RemoteException { //test for rollback if( !committed ) stateVariable = initializeState(); } //implementation of the EJB below }

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.

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.

the front controller (line 15). This ensures that all the incoming requests and outgoing responses are filtered out. The pointcut could have been factorized in a superclass, since it is the same for all the filters. Note that this technique is more flexible than the original. By modifying the pointcut we can, for instance, install the filters on the application controllers rather than only the front ones. The only disadvantage of this technique is that the filters are not defined in a declarative way (in the web.xml file). When a change is made, the application then needs to be recompiled.

For entity beans, the ejbLoad() and ejbStore() methods are the beginning and end of a transaction (also ejbCreate() and ejbRemove() basically where data is loaded or stored). If a rollback occurs, ejbLoad() will be invoked to restore the bean s state.

At the beginning of this chapter, we hinted at EJB s status as a pioneering technology. EJB is a groundbreaking technology that has raised the standards of serverside development. Just like Java itself, EJB has changed things in ways that are here to stay and inspired many innovations. In fact, up until a few years ago the only serious competition to EJB came from the Microsoft .NET framework. In this section, we ll point out a few of the compelling EJB 3 features that we feel certain will have this latest version at the top of your short list. Ease of use Thanks to the unwavering focus on ease of use, EJB 3 is probably the simplest server-side development platform around. The features that shine the brightest are POJO programming, annotations in favor of verbose XML, heavy use of