What it really means: 3. This objective can hit you on anything related to session beans, so you pretty much have to know it all, including the details of both stateless and stateful bean lifecycles, the container callback methods of SessionBean, what you must write in a bean class, and what a bean can get from its EJBContext. Anything covered by the other session bean objectives is fair game. First, you have to know that passivation is for only stateful session beans. Stateless beans go back to the bean pool without going through passivation.
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What it really means: 3. This objective can hit you on anything related to session beans, so you pretty much have to know it all, including the details of both stateless and stateful bean lifecycles, the container callback methods of SessionBean, what you must write in a bean class, and what a bean can get from its EJBContext. Anything covered by the other session bean objectives is fair game. First, you have to know that passivation is for only stateful session beans.
Stateless beans go back to the bean pool without going through passivation. So, ejbPassivate will never be called on a stateless bean.
You have to know that your responsibility in ejbPassivate is to make sure that when the method ends, your bean is ready for passivation, and that passivation may or may not involve serialization. You must know the state that your instance variables must be in at the time ejbPassivate ends. You must be able to look at a description of a desired behavior, like, figure out the security principal of the client, and know which method you can call, and on which interface, to get that behavior in this case, getCallerPrincipal called on the SessionContext interface.
To answer these questions, you have to know every method in the three key interfaces: SessionBean the interface your bean implements , SessionContext the interface your bean has a reference to , and SessionSynchronization an optional interface that a stateful bean can implement.
You must know the bean rules including: there can be only one create method in a stateless bean, and it must have no arguments; only stateful beans can implement SessionSynchronization, both stateless and stateful beans will not survive a container crash, stateless beans will never be passivated, stateless bean creation and removal is not tied to the client. And you have to know exactly which classes and methods are implemented by you the bean, the ejbRemove and ejbCreate methods, etc.
And you must know that local interface methods must not declare a RemoteException, but Remote interface methods must. And you must know that object type arguments to a Remote interface method are sent as serialized copies of the object, while arguments to local interfaces are sent as copies of the reference.
Head First EJB by Kathy Sierra, Bert Bates
Published on March 7, Write a customer review. Imagine what else you might want to do with your EJB object reference Being a Session Bean Furst the session bean lifecycle You remember how it all works, right? If you are a seller for this product, would you like to suggest updates through seller support? I head first ejb 3. Getting the Message Imagine head first ejb 3. It includes all you heead make sure you download the Java EE version. You can learn complete primary skills of VB fast and easily.
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Head First EJB
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