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Question ID 4562

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

Option A

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

Option B

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

Option C

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

Option D

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

Correct Answer A
Explanation


Question ID 4563

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?
 

Option A

A.    The method will return TRUE.
 

Option B

B.    The method will return FALSE.
 

Option C

C.    The method will throw an exception.
 

Option D

D.    The order instance will be removed from the database.
 

Correct Answer A
Explanation

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