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下記は本試験の問題でございます、皆と分かち合いします
1.A developer discovers that an exception being thrown from a business method on an entity
bean does not cause the transaction to rollback; a rollback was expected. What would correct this
problem?
A.Ensure that the business method throws an instance of javax.jts.TransactionRolledbackException.
B.Ensure that the business method marks the current transaction for rollback by calling the
setRollbackOnly() method on the EJBContext.
C.Call rollback() on the current UserTransaction object.
D.Call rollback() on the EJBContext.
E.call setRollbackOnly() on the UserTransaction object.
Correct:B
2.A developer is writing a task() method, in a session bean, which makes use of several entity
beans to perform a task. The session bean must record the invocation of the task using a
LogEntry entity bean. The log entry must NOT be made if the task fails. Assume that the LogEntry
bean is configured with 'Supports'. In order to GUARANTEE this behavior, the task() method of the
session bean should be configured as:
A.bean-managed transaction and explicitly begin an UserTransaction before creating the LogEntry
instance and performing the task logic. Finally, have the task() method commit or rollback the transaction
based on the success/failure of the task.
B.'Supports'. Within the task() method, create the LogEntry instance and perform the task logic. Finally,
have the task method() call sessionContext.setRollBackOnly() if the task logic fails.
C.'RequiresNew'. Within the method, create the LogEntry instance and perform the task logic. Finally,
have the task() method call sessionContext.setRollBackOnly() if the task fails.
D.'Mandatory'. Within the method, create the LogEntry instance and perform the task logic. Finally, have
the task() method call sessionContext.setRollBackOnly() if the task fails.
Correct:A C
3.While developing an EJB for an EJB 2.0 compliant server, a developer runs into a problem.
Whenever the method ejbContext.getUserTransaction() is called, an IllegalStateException is
thrown. Which of the following are possible causes for this behavior?
A.The bean is an entity bean.
B.The bean is a session bean.
C.A transaction has not been started.
D.Container-managed transaction demarcation is being used.
Correct:A D