Download Beginning EJB 3: Java EE 7 Edition by Peter Zadrozny, Raghu Kodali, Jonathan Wetherbee, Chirag PDF

By Peter Zadrozny, Raghu Kodali, Jonathan Wetherbee, Chirag Rathod

Enhance strong, standards-based, back-end company common sense with starting EJB three, Java EE 7 variation. Led through an writer group with two decades of mixed company JavaBeans adventure, you'll the way to use the recent EJB 3.2 APIs. You'll achieve the information and talents you’ll have to create the complicated firm purposes that run today's transactions and more.

Targeted at Java and Java EE builders, with and with no previous EJB adventure, starting EJB three is jam-packed with sensible insights, procedure counsel, and code examples. As each one bankruptcy unfolds, you'll not just discover a brand new sector of the spec; you'll additionally see how one can use it on your personal functions via particular examples.

Beginning EJB three will serve not just as a reference, however it also will functionality as a how-to consultant and repository of functional examples to that you can refer as you construct your individual purposes. it is going to assist you harness the ability of EJBs and take your Java EE 7 improvement to the subsequent point.

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Example text

Entity life cycle An entity instance may go through many formal states during its life as an in-memory Java object. Understanding these different states will help you know when the entity is in a consistent or inconsistent state with the back-end database and how to reconcile these differences within a transactional context. Object/relational (O/R) mapping JPA defines declarative markup through annotations and/or XML descriptors to map entity fields to table columns in a relational database management system (RDBMS).

Methods to perform Create, Retrieve, Update, and Delete operations, also known as CRUD methods, are exposed on a session bean to the client to provide a “façade” pattern that we will use throughout the book. Java Persistence API (JPA) was first introduced in Java EE 5, and it marked a departure from the previous persistence model of “entity beans” that were defined as part of the EJB specification. JPA is widely regarded as a tremendous improvement over the entity beans model defined in earlier versions of EJB.

The SearchFacade bean will access back-end databases to retrieve the requested information. To simplify the code examples in this chapter, we will actually retrieve the list of hard-coded values within the bean class. In later chapters, we will augment the SearchFacade bean to access the back-end database. 3. The bean returns to the client applications the information that satisfied the search criteria. Listing 2-1 shows the definition of the SearchFacade bean. In the following sections of this chapter, we will build the code that will show the preceding workflow in action.

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