Cdi In Java Ee 6 Development

By Author: mayur aegis
Total Articles: 64
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EJB annotation already exists in Java EE 6, the new version of Java platform and now to add in more flexibility and power @Inject which is a dependency injection model is added. Thus during java application development what should be used when. Offshore Java development is used for various purposes wherein there are lots of opportunities to develop Java messages services, framework, beans, servlets etc.
Proper configuration of EJB 3 dependency injection is often performed during creating effective and useful java solutions. A very simple to use dependency injection is what we call EJB 3 used as single annotation can cause the injection of declared bean. This bean could be an interface or no-interface bean. When you are only with single implementation of interface there is no need of any ceremony for injection. If you desire to clarify your selection then is the time you need configuring. While XML configuration also dependency injection can be configured in alternate to annotations but then too it’s based on string. You are here with an option none other than of matching string for implementation.
The container ...
... of EJB is efficient in handling security as well as many customized features with maximum transparency. When there is an indirection in place you are done with implementation of all features. The dependency injection is simple when the names of annotation are described by the behaviour of beans. When your case is stateless you get no connection between proxy and actual instance. Different clients are allowed to share the EJB instance between invocations. If the client is eager can overload the server and can communicate with the help of same proxy. Bean instances and client are connected with an relation known as N:M. Single bean instance all the time handles the request. Never will it happen that several requests would be handled concurrently. Clients are here not at allowed to disconnect or leave.

This dependency injection is freshly added to Java EE 6 and developers performing Java application development are boon with this new powerful specification that helps them to type-safe along with introduction of “contextual” references or scopes. Contexts play an important role for departing EJB beans and managed beans that are contextual. They possess well-defined scope and are produced and eliminated if the container gives it a demand. They already have scopes defined for them. All the beans are managed by container by automated processes. Finally in the ending process you get all the instances that associates with this scope with automatic removal.

The above discussed behaviour is very different from what we see in stateful session beans that needs to be explicitly eliminated by the client. This should be done along with the invocation of annotated method. This would not be removed automatically and is also not bounding to contexts. Here these beans need you ensuring of reliable destruction when you are finishing at the end or time is out for the session.

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