The before completion callback notifies a stateful session bean instance that a transaction is about to be committed.
This method executes in the proper transaction context.
Note: The instance may still cause the container to rollback the transaction by invoking the
setRollbackOnly() method on the session context or by throwing an exception.
A bean must have at most one
BeforeCompletion method. The signature of this method must observe the
A stateful session bean class may use either the
SessionSynchronization interface or the session
synchronization annotations, but not both.
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