Oracle 1z0-898 Exam Questions

Question 6 of 63

A developer has created an application managed entity manager.
Which statement is correct?

A new persistence context begins when the entity manager is created.

A new persistence context begins when a new JTA transaction begins.

A new persistence context begins when the entity manager is invoked in the context o\ transaction.

A new persistence context begins when the entity manager is invoked in the context of a resource-local transaction.

Correct Answer: A

Question 7 of 63

Given:
@PersistenceContext EntityManager em;
public boolean test(Order o) {
boolean b = false;
o = em.merge(o);
em.remove(o);
o = em.merge(o);
b = em.contains(o);
return b;
}
Which statement is correct?

The method will return TRUE.

The method will return FALSE.

The method will throw an exception.

The order instance will be removed from the database.

Correct Answer: A

Question 8 of 63

If an application uses an extended persistence context, which of the following is true?

The persistence context exists until all transactions invoked by the EntityManager complete.

The persistence context exists until all transactions invoked by the EntityManagar complete and the EntityManager.clear () method is invoked.

The persistence context exists until the EntityManager instance is closed.

The persistence context exists until the EntityManagerFactory instance is closed.

Correct Answer: C

Question 9 of 63

An application uses an application-managed entity manager. Which of the following is NOT true?

The application may specify whether the scope of the persistence context is extended.

The application must use EntityManagerFactory instances to create entity managers.

Entity manager instances must be explicitly closed.

The application may need to call EntityManager. joinTransaction if a JTA aware entity manager is used.

Correct Answer: D

Question 10 of 63

An application that uses container-managed transaction demarcation creates a query within an active transaction and receives a QueryTimeoutException. Which of those scenarios describes what happens to the active transaction?

The statement and the transaction continue.

The query is recreated within the current transaction.

The statement and the transaction are marked for rollback.

The statement is rolled back, but the transaction continues.

Correct Answer: D