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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.

I do not recommend doing this on production sites, because Drupal does not save the aliases after they are deleted, and if users or search engines try to access a page, they will receive a 404 not found error If you need to change aliases after a site is in.

Figure 7-13. Change the Y property in the Projection section of the Transform bucket. Notice how your Timeline now has a KeyFrame on it in the form a circular icon at the 2 second mark (see Figure 7-14).

2.6 Summary

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.

Figure 7-14. Blend added KeyFrames to the Timeline. If you click the Play icon at the top of the Timeline panel, you will see how the Storyboard will affect the Ellipse. Now we need to set the Repeat Behavior for this Storyboard to Forever in XAML. Let s do that now.

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art 2 of this book covers how you can use EJB 3 components (session beans and message-driven beans) to build business logic for your enterprise Java applications. 3 covers session beans in detail and describes the development of both stateless and stateful beans and their clients. The chapter provides guidelines to help you decide whether to use stateless or stateful session beans. Asynchronous communication is accomplished by messaging, and chapter 4 explores messaging and message-driven beans. You can use several advanced features, such as dependency injection, interceptors, and timers; these topics are examined in chapter 5. 6 covers enterprise applications development concerns, such as transaction and security.

Development of stateless and stateful session beans Session bean lifecycle Session bean clients Session bean performance considerations and best practices

You can also set the RepeatBehavior in Blend by clicking the Storyboard in the Objects and Timeline panel and locating the property in the Properties panel.