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!!! EJB Frequently Asked Questions !!!

Q. what are Container-Managed Transactional arributes ?

SCJP 1.5/1.6 Exam Kit

!!!Answer!!!- From Technical Expert

NotSupported
The bean is not involved in a transaction. If the bean invoker calls the bean while involved in a transaction, the invoker's transaction is suspended, the bean executes, and when the bean returns, the invoker's transaction is resumed.

Required
The bean must be involved in a transaction. If the invoker is involved in a transaction, the bean uses the invoker's transaction. If the invoker is not involved in a transaction, the container starts a new transaction for the bean.

Supports
Whatever transactional state that the invoker is involved in is used for the bean. If the invoker has begun a transaction, the invoker's transaction context is used by the bean. If the invoker is not involved in a transaction, neither is the bean.

RequiresNew
Whether or not the invoker is involved in a transaction, this bean starts a new transaction that exists only for itself. If the invoker calls while involved in a transaction, the invoker's transaction is suspended until the bean completes.

Mandatory
The invoker must be involved in a transaction before invoking this bean. The bean uses the invoker's transaction context.

Never
The bean is not involved in a transaction. Furthermore, the invoker cannot be involved in a transaction when calling the bean. If the invoker is involved in a transaction, a RemoteException is thrown.

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