By Peter Zadrozny, Raghu Kodali, Jonathan Wetherbee, Chirag Rathod
Boost robust, standards-based, back-end company good judgment with starting EJB three, Java EE 7 variation. Led by way of an writer staff with twenty years of mixed firm JavaBeans event, you'll how you can use the hot EJB 3.2 APIs. You'll achieve the data and abilities you’ll have to create the advanced company functions that run today's transactions and more.
Targeted at Java and Java EE builders, with and with no past EJB event, starting EJB three is filled with useful insights, approach counsel, 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 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 sensible examples to that you may refer as you construct your personal purposes. it's going to assist you harness the facility of EJBs and take your Java EE 7 improvement to the following point.
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Additional resources for Beginning EJB 3: Java EE 7 Edition
SearchFacadeClient also looks up the ShopperCount singleton bean and invokes the getShopperCount() business method to print the number of shoppers logged. 49 Chapter 2 ■ EJB Session Beans ■■Note If the remote client is a Java application or command-line program, an application client container can be used to invoke the session beans. Application client containers support dependency injection for remote clients. We will discuss application client containers in Chapter 12, along with other types of client applications.
However, you can annotate the bean class with @Startup to indicate that the container must initialize the singleton bean during the application startup sequence. When multiple singleton session beans are used within an application, the application might require that they be initialized in a specific sequence. @DependsOn annotation declares the startup dependencies of a singleton session bean. Listing 2-18 shows the definition of the LogShopperCount session bean that is dependent on the ShopperCount session bean.
Bean-Managed concurrency: The container allows full access to the concurrent bean instance, and the user is responsible for state synchronization. ejb. ConcurrencyManagement annotation specified on the singleton session bean class. ConcurrencyManagementType. ejb. BEAN. Container-Managed Concurrency For a singleton session bean using container-managed concurrency, the container manages concurrency by associating each business method with either a shared Read lock or an exclusive Write lock. A Read or Write lock is specified using the @Lock annotation.