Download Beginning Java EE 7 by Antonio Goncalves PDF

By Antonio Goncalves

Java company variation (Java EE) is still one of many top Java applied sciences and structures. starting Java EE 7 is the 1st instructional ebook on Java EE 7.

Step via step and straightforward to stick with, this e-book describes a number of the Java EE 7 standards and reference implementations, and indicates them in motion utilizing functional examples. This definitive booklet additionally makes use of the most recent model of GlassFish to set up and administer the code examples.

Written via knowledgeable member of the Java EE specification request and overview board within the Java neighborhood approach (JCP), this ebook includes the easiest info attainable, from an expert’s point of view on company Java applied sciences.

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Sample text

Instead, you need to inject the bean and the container does the rest, meaning, the container is the one responsible for managing the life cycle of the bean: it creates the instance; it gets rid of it. So how do you initialize a bean if you can’t call a constructor? Well, the container gives you a handle after constructing an instance and before destroying it. Figure 2-1 shows the life cycle of a Managed Bean (and therefore, a CDI Bean). When you inject a bean, the container (EJB, Web, or CDI container) is the one responsible for creating the instance (using the new keyword).

In our example we could replace all these qualifiers by using the single qualifier @NumberOfDigits with an enumeration as a value and a Boolean for the parity (see Listing 2-13). Listing 2-13. The @NumberOfDigits with a Digits Enum and a Parity Boolean @Qualifier @Retention(RUNTIME) @Target({FIELD, TYPE, METHOD}) public @interface NumberOfDigits { Digits value(); boolean odd(); } public enum Digits { TWO, EIGHT, TEN, THIRTEEN } 35 Chapter 2 ■ Context and Dependency Injection The manner in which you would use this qualifier with members doesn’t change from what you’ve seen so far.

So your client code is not impacted. The code that follows injects the default implementation of a number generator. If the alternative is enabled, then the MockGenerator defined in Listing 2-14 will be injected. xml files declaring several alternatives depending on your environment (development, production, test . ). Producers I’ve shown you how to inject CDI Beans into other CDI Beans. , int, long, float . ), array types and any POJO that is not CDI enabled, thanks to producers. xml file. String.

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