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

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

Increase robust, standards-based, back-end enterprise good judgment with starting EJB three, Java EE 7 variation. Led via an writer crew with twenty years of mixed firm JavaBeans event, you'll how to use the hot EJB 3.2 APIs. You'll achieve the data and abilities you’ll have to create the complicated firm functions that run today's transactions and more.

Targeted at Java and Java EE builders, with and with no past EJB adventure, starting EJB three is full of functional insights, process information, and code examples. As every one bankruptcy unfolds, you'll not just discover a brand new zone of the spec; you'll additionally see how one can use it on your individual 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 useful examples to you could refer as you construct your individual functions. it is going to assist you harness the facility of EJBs and take your Java EE 7 improvement to the subsequent point.

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Extra info for Beginning EJB 3: Java EE 7 Edition

Example text

0 have allowed for advanced configuration of JPA that extends beyond the scope of this book. In the next chapter, however, we describe a number of features that we feel are essential to an introduction to JPA in its latest revision. In the spirit of this book, the two chapters on persistence will cover the most commonly used features, describing their use through practical examples using our online wine store application. This chapter will get you started writing entity classes and using the key persistence features.

Chapter 2 ■ EJB Session Beans PostConstruct callback happens after a bean instance is instantiated in the EJB container. If the bean is using any dependency injection mechanism for acquiring references to resources or other objects in its environment, the PostConstruct event happens after injection is performed and before the first business method in the bean class is called. PreDestroy callback happens during application shutdown. The container considers the DependsOn relationship between singleton session beans and removes them in a sequence that is in the reverse order of the sequence in which they were created.

The management of concurrent access is transparent to the clients. A client needs only a reference to a singleton session bean, and it is unconcerned about other clients accessing the same instance of the singleton session bean. Concurrency is managed in two ways: • Container-Managed concurrency: The container controls concurrent access and allows finegrained control of the state synchronization behavior by offering a fixed set of options. This is the default concurrency management type. • Bean-Managed concurrency: The container allows full access to the concurrent bean instance, and the user is responsible for state synchronization.

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