Entity lifecycle callback methods may be defined in which three classes? (Choose three)

Correct Answer: BDE 🗳️
Entity Listeners and Callback Methods
A method may be designated as a lifecycle callback method to receive notification of entity lifecycle events. A lifecycle callback method can be defined on an entity class, a mapped superclass, or an entity listener class associated with an entity or mapped superclass.
Reference: How to inject a spring's service bean into a JPA Entity?

http://stackoverflow.com/questions/3747268/how-to-inject-a-springs-service-bean-into-a-jpa-entity

A developer wrote an entity class with the following method:
Private static Logger logger = Logger.getLogger ("myLogger");
@PrePersist
@PreUpdate
Public void doA () {
Logger.info ("A");
}
@PostPersist
@PostUpdate
Public void doB () {
logger.info ("B");
}
What will the log message contain when an application does the following?
1. Begins a transaction
2. Creates the entity
3. Persists the entity
4. Commits the transaction
5. Begins the entity data
6. Modifies the entity data
7. Merges the entity
8. Commits the second transaction

Correct Answer: B 🗳️

Given the following code:
Public void create () {
try {
doA () {
} catch (PersistenceException e) {}
try (doB) ();
} catch (PersistenceException e) {}
}
Calling method doA will cause an NonUniqueResultException to be thrown. Calling method doB will cause an EntityExistsException to be thrown.
What two options describe what will happen when the create method is called within an application ' uses container managed transactions? (Choose two)

Correct Answer: BE 🗳️
B:
PersistenceException is thrown by the persistence provider when a problem occurs. All instances of PersistenceException except for instances of
NoResultException, NonUniqueResultException, LockTimeoutException, and QueryTimeoutException will cause the current transaction, if one is active, to be marked for rollback.
E: EntityExistsException is thrown by the persistence provider when EntityManager.persist(Object) is called and the entity already exists. The current transaction, if one is active, will be marked for rollback.
Reference: javax.persistence, Class PersistenceException
Reference: javax.persistence, Class EntityExistsException

An application that uses pessimistic locking calls an updateData method that results in a LockTimeoutException being thrown. What three statements are correct?
(Choose three)

Correct Answer: ADF 🗳️
LockTimeoutException is thrown by the persistence provider when an pessimistic locking conflict occurs that does not result in transaction rollback. This exception may be thrown as part of an API call, at, flush or at commit time. The current transaction, if one is active, will be not be marked for rollback.
Reference: javax.persistence, Class LockTimeoutException