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32 try { 33 Thread.sleep(1000); 34 result = proceed ( 35 customerId,type,description, 36 balance,creditLine,beginBalance,beginBalanceTimeStamp); 37 } catch (InterruptedException ex2) { 38 ex2.printStackTrace(); 39 } 40 } 41 return result; 42 } 43 } The advice code of the aspect in Listing 12-7 is linked to the retry pointcut, which denotes the calls to the implementations of the remote Bank interface (line 16). The initial call of the service is done through the first call to proceed (line 29). If an error occurs, the retried call is done through a second call to proceed (line 34) after having waited one second (line 33). This aspect code can fall into an infinite loop when the communication layer systematically throws a RemoteException. This problem must be handled by modifying the implementation or by defining a new advice code to detect and break the infinite loops in a generic way. To apply this aspect to a set of methods, instead of one particular method, we can use the nontyped generic AOP, which uses wildcards and the joinpoint API to access the base level information reflectively. Thus, the solution presented in Listing 12-8 is applied to all the facade s methods. Listing 12-8. Applying the Retry Aspect to All Bank Methods Object around(): call(public * Bank+.*(..)) && within(Simple) { Object result=null; try { result = proceed(); } catch (RemoteException ex) { try { Thread.sleep(1000); result = proceed(); } catch (InterruptedException ex2) { ex2.printStackTrace(); } } return result; }

When developing EJBs, you have a multitude of changes to the bean class that affect the final deployment descriptor of the bean. Even if you generate the deployment descriptor once, you may have to change it each time you alter a bean class, interface, or persistent feature. In addition, changes to security roles, method permissions, and EJB relationships require you to modify the XML descriptor. Generating the deployment XML is only part of an important task. XDoclet will help you maintain this file by updating it as your beans change and develop.

discussed earlier, the @Id and @GeneratedValue value annotations specify that the BID_ID column is the primary key of the BIDS table and that the JPA provider should automatically generate a value for the column before the INSERT statement is issued (the 52 value in the SQL sample). This process of translating an entity to columns in the database is exactly what object-relational mapping and JPA is all about. This brings us to the end of this brief introduction to the EJB 3 Java Persistence API and to the end of this whirlwind chapter. At this point, it should be clear to you how simple, effective, and robust EJB 3 is, even from a bird s-eye view.

2.6 Summary

To have XDoclet generate your deployment descriptor, add the <deploymentdescriptor/> subtask to your <ejbdoclet/> task in the build.xml file. (See the section An XDoclet appetizer at the beginning of this chapter for information about XDoclet setup and the build.xml file.) The <ejbdoclet/> task shown in listing 2.6 uses the descriptor subtask.

As we stated in the introduction, the goal of this chapter was not to feed you the guru pill for EJB 3, but rather to show you what to expect from this new version of the Java enterprise platform. This chapter introduced the ActionBazaar application, a central theme to this book. Using a scenario from the ActionBazaar application, we showed you a cross section of EJB 3 functionality, including stateless session beans, stateful session beans, message-driven beans, and the EJB 3 Java Persistence API. You also learned some basic concepts such as deployment descriptors, metadata annotations, and dependency injection. We used a stateless session bean (PlaceBidBean) to implement the business logic for placing a bid for an item in an auctioning system. To access the bean, we built a very simple servlet client that used dependency injection. We then saw a stateful session bean (PlaceOrderBean) that encapsulated the logic for ordering an item, and we built an application client that accesses the PlaceOrderBean. We saw an example of an MDB, OrderBillingMDB, that processes a billing request when a message arrives on a JMS queue. Finally, we built an entity for storing bids and used the EntityManager API to persist the entity to the database. Most of the rest of this book roughly follows the outline of this chapter. 3 revisits session beans; chapter 4 discusses messaging, JMS and MDBs; chapter 5 expands on dependency injection and discusses such topics as interceptors and timers; and chapter 6 explores transactions and security management in EJB. s 7 through 10 are devoted to a detailed exploration of the Persistence API. Finally, chapters 11 through 16 cover advanced topics in EJB. In the next chapter, we ll shift to a lower gear and dive into the details of session beans.