Explain Stateful session bean life cycle?

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Explain Stateful session bean life cycle?..

Answer / hari

Life Cycle of a Stateful Session Bean

While in the ready stage, the EJB container may decide to deactivate, or passivate, the bean by moving it from memory to secondary storage. (Typically, the EJB container uses a least-recently-used algorithm to select a bean for passivation.) The EJB container invokes the bean's ejbPassivate method immediately before passivating it. If a client invokes a business method on the bean while it is in the passive stage, the EJB container activates the bean, moving it back to the ready stage, and then calls the bean's ejbActivate method.

At the end of the life cycle, the client invokes the remove method and the EJB container calls the bean's ejbRemove method. The bean's instance is ready for garbage collection.

Your code controls the invocation of only two life-cycle methods--the create and remove methods in the client. All other methods in are invoked by the EJB container. The ejbCreate method, for example, is inside the bean class, allowing you to perform certain operations right after the bean is instantiated. For instance, you may wish to connect to a database in the ejbCreate method.

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Explain Stateful session bean life cycle?..

Answer / srinivas

* A stateless session bean instance’s life starts when
the container invokes newInstance() on the session bean
class to create a new instance. Next, the container calls
setSessionContext() followed by ejbCreate() on the instance.
The container can perform the instance creation at any
time—there is NO relationship to a client’s invocation of
the create() method.
* The session bean instance is now ready to be
delegated a business method call from any client.
* When the container no longer needs the instance
(usually when the container wants to reduce the number of
instances in the method-ready pool), the container invokes
ejbRemove() on it. This ends the life of the stateless
session bean instance.

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