By Antonio Goncalves
Java firm variation (Java EE) remains to be one of many major Java applied sciences and systems. Beginning Java EE 7 is the 1st educational e-book on Java EE 7.
step-by-step and simple to stick to, this publication describes a few of the Java EE 7 necessities and reference implementations, and exhibits them in motion utilizing functional examples. This definitive e-book 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 evaluate board within the Java neighborhood approach (JCP), this booklet comprises the simplest info attainable, from an expert's point of view on company Java technologies.
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Additional resources for Beginning Java EE 7
Listing 2-2. generateNumber()); return book; } } 29 Chapter 2 ■ Context and Dependency Injection The code in Listing 2-2 is pretty simple and does the job. In the constructor the BookService creates an instance of IsbnGenerator and affects it to the numberGenerator attribute. generateNumber() method would generate a 13-digit number. But what if you want to choose between implementations and not just get wired to the IsbnGenerator? One solution is to pass the implementation to the constructor and leave an external class to choose which implementation it wants to use (see Listing 2-3).
Table 2-2. > getBean() Gets the Bean object representing the bean that defines the injection point Member getMember() Gets the Field object in the case of field injection Annotated getAnnotated() Returns an AnnotatedField or AnnotatedParameter depending upon whether the injection point is an injected field or a constructor/method parameter boolean isDelegate() Determines if the injection point is a decorator delegate injection point boolean isTransient() Determines if the injection is a transient field Listing 2-18.
When you develop a session bean, you just concentrate on your business code. ). With interceptors, you add your own cross-cutting mechanisms and apply them transparently to your business code. 25 Chapter 2 ■ Context and Dependency Injection Loose Coupling and Strong Typing Interceptors are a very powerful way to decouple technical concerns from business logic. Contextual life-cycle management also decouples beans from managing their own life cycles. With injection a bean is not aware of the concrete implementation of any bean it interacts with.