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The disadvantage of this approach is that it will only work for stateless applications, not when using stateful session beans. We tackle that situation next!

The JavaDoc tag is used to specify a data accessor that indicates the entity data relationship. In this case, the OwnerBean entity data is related to the DataBean entity bean. The three attributes shown with the tag are the mandatory properties that must be set when using this tag.

As you know, stateful session beans are used to maintain conversation state between the client and server by storing the state in instance variables. If you want end-to-end availability for your applications, then you have to maintain state. You probably also want session state to be replicated to other servers, so that if one server crashes the client state is restored from another server, as shown in figure 13.8. Assume that when a client accesses a stateful session bean in a cluster it gets bound to a stateful EJB in Server 2. It establishes a conversation, and state is stored in the bean instance in Server 2. Because we have session state replication enabled for the EJB, the state is replicated to Server 1 and Server 3. If Server 2 should happen to crash, then the client will be routed to one of the other servers and the conversation state will be restored. Application servers support several mechanisms to propagate changes in the session state, such as IP multicasting peers and peer-to-peer. The session state change is copied to other servers in the group when one of the following occurs:

factory that will be responsible for creating aspect instances according to the programmers needs. Finally, Spring AOP default policy is also to instantiate aspects as singleton. Although the framework approach provides default policies, it is always possible to instantiate an aspect dynamically by using a lower-level Java API. In each framework (JAC, JBoss, and Spring), it is thus possible to dynamically add new pieces of advice and introductions to a target object. These features make the framework approach much more flexible than the language approach.

At regular intervals (such as the end of every method call) When a JVM is terminated At the end of a transaction

Refer to your vendor documentation to learn what propagation mechanisms are supported for session replication. Additionally, you have to make changes in your session bean configuration using either a proprietary annotation or a deployment descriptor to enable session replication. This will set the appropriate propagation mechanism for your session bean. To expedite the configuration process,

2.3 Keeping your EJB deployment descriptor current 3.7 Modeling one-to-one entity data relationships

Figure 13.8 Session state is replicated to other servers based on the server: 1) clients establish a session with a stateful bean in Server 2; 2) conversation state is replicated to Server 1 and Server 3 because state replication is enabled; and 3) if Server 2 crashes, the client gets routed to either Server 1 or Server 3 and there will be no loss in its state.

When several aspects apply around the same joinpoint, the execution order of these aspects must be specified Most of the time, this ordering depends on the semantics of aspects, and no automatic rules can be defined When considering a trace and a security aspect, for example, the trace may be executed before the security if programmers want to trace every request Alternatively, the security may be executed first if programmers need only tracing requests from unauthorized users In such a case, the programmers must explicitly specify the ordering With AspectJ, aspect ordering is defined with the instruction declare precedence The order is global and applies to the whole application Some ordering may be left unspecified, and in this case, there is no guarantee of the execution order With JAC, aspect ordering is defined with the system property jaccompwrappingOrder.

we recommend that you check your vendor s documentation before you implement stateful session bean clustering. Here are some best practices we recommend to developers for using stateful session bean clustering:

You want to generate the XML for the JMS message destination type while generating the deployment descriptor for a message-driven bean.