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Once the communication concerns are managed, the client handles the presentation, which is usually a complicated task. In the case of Swing-based clients, the techniques do not differ from non-J2EE applications. For a thin web client, the implementation differs, since the presentation is located on the server side within a web container over JSP/Servlets. This section presents use cases for AOP in the presentation tier. First, we show examples of the UI in general. Next, we study the web presentation tier by enhancing the design patterns commonly used for this tier.

<ejb-class>UserBean</ejb-class> <session-type>Stateful</session-type> <transaction-type>Bean</transaction-type> </session>

strategy results in a large number of NULL -valued columns. Moreover, adding a new subclass essentially means updating the unified table each time. In the joined-tables strategy, adding a subclass means adding a new child table as opposed to altering the parent table (which may or may not be easier to do). By and large, we recommend the joined-tables strategy since it best utilizes the strengths of the relational database, including the ability to use normalization techniques to avoid redundancy. In our opinion, the performance cost associated with joins is relatively insignificant, especially with surrogate keys and proper database indexing. The table-per-class strategy is probably the worst choice of the three. It is relatively counterintuitive, uses almost no relational database features, and practically magnifies the object relational impedance instead of attempting to bridge it. The most important reason to avoid this strategy, however, is that EJB 3 makes it optional for a provider to implement it. As a result, choosing this strategy might make your solution nonportable across implementations. Beside these inheritance strategies, the EJB 3 JPA allows an entity to inherit from a nonentity class. Such a class is annotated with @MappedSuperClass. Like an embeddable object, a mapped superclass does not have an associated table.

As we mentioned earlier, EJB 3 makes O/R mapping a lot easier, but not quite painless. This is largely because of the inherent complexity of ORM and the large number of possible combinations to handle. The good news is that a project to create an Eclipse-based EJB 3 mapping tool code-named Dali is under way (www.eclipse.org/ dali/). The project is led by Oracle and supported by JBoss and BEA. It will be a part of Eclipse web tool project (WTP) and will support creating and editing EJB 3 O/R mappings using either annotations or XML. Also, two commercial products, Oracle JDeveloper and BEA Workshop, support development of EJB 3 applications.

@Remote(BidManager.class) @Stateless public class BidManagerBean { ... }

Use the getUserTransaction() method of the EJBContext class (as shown in the recipe) to acquire a transaction instance. Once you have an instance of UserTransaction, you can do the following:

Because of its complexity, the UI often represents an important part of an application s development. Although these concerns are not J2EE specific, aspects can help in their development. In the sections that follow, we illustrate the use of AOP for two generic UI concerns: internationalization and condition verification on input data. To do so, we rely on the Java Swing administration client of the banking application.

The preceding code marks the BidManager interface as remote through the bean class itself. This way, if you change your mind later, all you d have to do is change the access type specification in the bean class without ever touching the interface. Next, we move on to discussing the EJB lifecycle in our example.

We introduced you to lifecycle callback methods, or callbacks, earlier in the chapter; now let s take a deeper look at how they are used with stateless session beans. As far as EJB lifecycles go, stateless session beans have a simple one, as depicted in figure 3.5. In effect, the container does the following:

transaction.begin(); //perform operations inside a transaction transaction.commit();

Figure 3.5 The chicken or the egg the stateless session bean lifecycle has three states: does not exist, idle, or busy. As a result, there are only two lifecycle callbacks corresponding to bean creation and destruction.