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The first annotation is @Aspect. A Java class annotated with @Aspect is understood as an aspect. The following code snippet defines the TraceAspect4 aspect: @Aspect public class TraceAspect4 { // ... } You learned in the Advanced Features section earlier in this chapter that aspects can be qualified, either with an instantiation clause (using perthis, pertarget, percflow, or percflowbelow) or with the privileged keyword. These qualifiers still exist with the @Aspect annotation style. For example, the following annotation @Aspect( instantiationModel=AspectInstantiationModel.PERTARGET, perClausePattern="aPointcutDefinition()", isPrivileged=true ) defines a privileged aspect with a PERTARGET instantiation model.

In the typical case that a Java EE module has a single persistence unit, specifying the unitName might seem redundant. In fact, most persistence providers will resolve the unit correctly if you don t specify a unitName. However, we recommend specifying a persistence unit name even if you only have one unit. This ensures that you are not dependent on container-specific functionality since the specification doesn t state what the persistence provider must do if the unitName is not specified. EntityManager scoping The element type specifies the EntityManager scope. As we noted, for a containermanaged EntityManager, scope can either be TRANSACTION or EXTENDED. If the type element is left empty, the scope is assumed to be TRANSACTION. Not surprisingly, the typical use of the type element is to specify EXTENDED for an EntityManager. The code would look like this:

The second part of this recipe is to create only local interfaces for your entity beans (this requires EJB 2.0 at a minimum). With only local interfaces for your entity beans, no remote clients have the ability to look up an entity bean and are forced to go through the session facade.

@PersistenceContext(type=PersistenceContextType.EXTENDED) EntityManager entityManager;

You are not allowed to use extended persistence scope for stateless session beans or MDBs. If you stop and think for second, the reason should be pretty obvious. The real reason for using extended scope in a bean would be to manage entity state across multiple method calls, even if each method call is a separate transaction. Since neither sessions nor message-driven beans are supposed to implement such functionality, it makes no sense to support extended scope for these bean types. On the other hand, extended persistence scope is ideal for stateful session beans. An underlying EntityManager with extended scope could be used to cache and maintain the application domain across an arbitrary number of method calls from a client. More importantly, you could do this and still not have to give up method-level transaction granularity (most likely using CMT). We ll return to our discussion of how you can use an extended persistence context for stateful session beans as an effective caching mechanism in chapter 13.

The point of this recipe is to highlight that good design can solve most of your EJB application problems. You should normally use a session bean as the only access to your entity bean layer. To ensure this, implement only local interfaces for your entity beans. To access the entity beans, a user must use the session bean, which can access the user s credentials and use custom finder methods on the entity beans to return those appropriate for the particular user only. The EJB client passes its account number and credentials to the session facade, which uses the information in a finder method on the entity bean implemented to use the account number. This design ensures only the correct data is returned to the user. By using only local interfaces for your entity beans, you deny any remote access to the beans. Combine the local entity beans with a session facade to the entity beans and you effectively wrap them with a security layer provided by a session bean. The session facade can use all the normal EJB security mechanisms, such as roles and method permissions, to protect your entity data.

The real power of container-managed EntityManagers lies in the high degree of abstraction they offer. Behind the scenes, the container instantiates EntityManagers, binds them to JNDI, injects them into beans on demand, and closes them when they are no longer needed (typically when a bean is destroyed).

experts, and aspects allow you to more easily integrate these functionalities into the rest of the application. No doubt the adoption of AOP will take a long time and require effort, but it can be done gradually when the need is clearly identified.