New PDF release: Pro EJB 3: Java Persistence API
By Mike Keith
Company JavaBeans 3.0 (EJB 3.0) is a crucial section of the recent Java company variation five platform (previously known as J2EE). they're used for the advance and deployment of component-based company company functions. Ever when you consider that its first unlock, EJB has been the topic of a lot media awareness and no little controversy. EJBs characterize a cosmopolitan and robust expertise and EJB-based functions can aid excessive numbers of transactions and clients, with greatest safeguard. besides the fact that, prior incarnations of EJB have grow to be appeared through many as a very complicated know-how that could result in expensive and time-consuming suggestions which are tough to construct, enforce and preserve. EJB three is determined to alter all that. It has made large advances in ease of improvement, and its vastly simplified programming version has been commonly acclaimed and embraced. on the middle of the recent EJB three spec is a huge relief within the complexity of the EJB endurance and object-relational mapping mechanisms (essentially the entity beans component to the specification). This ebook offers the definitive advisor to the EJB three endurance expertise. The lead writer, Mike Keith, is a co-lead at the EJB 3.0 specialist staff (under JSR 220) and offers remarkable perception and services in this subject. He and his co-authors dissect and clarify the recent EJB three endurance specification in complete element, describing the right way to use this refined know-how to its complete power. Assuming a simple wisdom of Java, SQL, JDBC and a few J2EE adventure, this publication teaches you EJB three endurance from the floor up. It presents the reader with an entire and in-depth knowing of the EJB 3.0 patience API and the way to take advantage of it in perform.
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Additional resources for Pro EJB 3: Java Persistence API
The second annotation that we need to add is @Id. This annotates the particular field or property that holds the persistent identity of the entity (the primary key) and is needed so the provider knows which field or property to use as the unique identifying key in the table. 21 22 CHAPTER 2 ■ GETTING STARTED Adding these two annotations to our Employee class, we end up with pretty much the same class that we had before, except that now it is an entity. Listing 2-2 shows the entity class. Listing 2-2.
Finally, we aggregated all of these techniques and combined them into a simple application that we can execute in isolation from an enterprise environment. In the next chapter, we will look at the impact of the Java EE environment when developing enterprise applications using the Java Persistence API. CHAPTER 3 ■■■ Enterprise Applications N o technology exists in a vacuum, and the Java Persistence API is no different than any other in this regard. Although the fat-client style of application demonstrated in the previous chapter is a viable use of the Java Persistence API, the vast majority of enterprise Java applications are deployed to a Java EE application server.
Listing 2-2. salary = salary; } } When we say that the @Id annotation is placed on the field or property, we mean that the user can choose to annotate either the declared field, or the getter method4 of a JavaBean-style property. Either field or property strategy is allowed, depending upon the needs and tastes of the entity developer, but whichever strategy is chosen, it must be followed for all persistent state annotations in the entity. We have chosen in this example to annotate the field because it is simpler; in general, this will be the easiest and most direct approach.
Pro EJB 3: Java Persistence API by Mike Keith