By Antonio Goncalves

Java firm version (Java EE) is still one of many top Java applied sciences and structures. Beginning Java EE 7 is the 1st instructional e-book on Java EE 7.

step-by-step and simple to persist with, this e-book describes a few of the Java EE 7 requisites and reference implementations, and indicates them in motion utilizing useful examples. This definitive publication additionally makes use of the most recent model of GlassFish to installation and administer the code examples.

Written by way of knowledgeable member of the Java EE specification request and overview board within the Java group technique (JCP), this ebook comprises the simplest details attainable, from an expert's viewpoint on company Java technologies.

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Example text

But it was limited to certain resources (datasource, EJB . ) and into certain components (Servlets, EJBs, JSF backing bean . ). With CDI you can inject nearly anything anywhere thanks to the @Inject annotation. Note that in Java EE 7 you can still use the other injection mechanisms (@Resource . ) but you should consider using @Inject whenever it is possible (see the “Producers” section later in this chapter). Listing 2-4 shows how you would inject a reference of the NumberGenerator into the BookService using the CDI @Inject.

This scope is for objects that are needed throughout the session such as user preferences or login credentials. • Request scope (@RequestScoped): Corresponds to a single HTTP request or a method invocation. The bean is created for the duration of the method invocation and is discarded when the method ends. It is used for service classes or JSF backing beans that are only needed for the duration of an HTTP request. • Conversation scope (@ConversationScoped): Spans between multiple invocations within the session boundaries with starting and ending points determined by the application.

As shown in Figure 2-2, when a client invokes a method on a Managed Bean (and therefore a CDI Bean, an EJB, a RESTful web service . ), the container is able to intercept the call and process business logic before the bean’s method is invoked. Interceptors fall into four types. 44 • Constructor-level interceptors: Interceptor associated with a constructor of the target class (@AroundConstruct), • Method-level interceptors: Interceptor associated with a specific business method (@AroundInvoke), Chapter 2 ■ Context and Dependency Injection • Timeout method interceptors: Interceptor that interposes on timeout methods with @AroundTimeout (only used with EJB timer service, see Chapter 8), and • Life-cycle callback interceptors: Interceptor that interposes on the target instance life-cycle event callbacks (@PostConstruct and @PreDestroy).

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