By Antonio Goncalves
Java company version (Java EE) remains to be one of many prime Java applied sciences and systems. Beginning Java EE 7 is the 1st instructional booklet on Java EE 7.
step-by-step and simple to keep on with, this publication describes a number of the Java EE 7 requirements and reference implementations, and indicates them in motion utilizing functional examples. This definitive e-book additionally makes use of the latest model of GlassFish to set up and administer the code examples.
Written by way of a professional member of the Java EE specification request and overview board within the Java neighborhood approach (JCP), this publication comprises the simplest info attainable, from an expert's standpoint on firm Java technologies.
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Extra info for Beginning Java EE 7
Beans can use event notifications to decouple event producers from event consumers or decorators to decouple business concerns. In other words, loose coupling is the DNA on which CDI has been built. And all these facilities are delivered in a typesafe manner. CDI never relies on String-based identifiers to determine how objects fit together. , qualifiers, stereotypes, and interceptor bindings) to wire beans together. Usage of XML descriptors is minimized to truly deployment-specific information.
Let’s say we have an application with a BookService that creates books with a 13-digit ISBN number and a LegacyBookService that creates books with an 8-digit ISSN number. As you can see in Figure 2-5, both services inject a reference of the same NumberGenerator interface. The services distinguish between the two implementations by using qualifiers. Figure 2-5. Services using qualifiers for non-ambiguous injection A qualifier represents some semantics associated with a type that is satisfied by some implementation of that type.
To specify a class interceptor, you need to develop a separate class and instruct the container to apply it on a specific bean or bean’s method. To share some code among multiple beans, let’s take the logMethod() methods from Listing 2-23 and isolate it in a separate class as shown in Listing 2-24. Notice the init() method which is annotated with @AroundConstruct and will be invoked only when the constructor of the bean is called. Listing 2-24. getName()); } } } The LoggingInterceptor can now be wrapped transparently by any bean interested in this interceptor.