Start Quiz: Java persistence api (jpa)

Question: What causes the entity manager to move an Entity instance from the managed to the detached state?

Choices:

Invoke the detach() method of the entity manager on the instance

Invoke the remove() method of the entity manager on the instance

Invoke the unsynchronize() method of the entity manager on the instance

when the associated persistence context ends at the end of the transaction boundary.

Question: What causes the entity manager to move an Entity instance from the detached to the managed state?

Choices:

Invoke the persist() method of the entity manager on the instance

Invoke the merge() method of the entity manager on the instance

Invoke the manage() method of the entity manager on the instance

Invoke the remove() method of the entity manager on the instance

Question: Given the code snippet below, which of the following statements are true?

Choices:

At line 1 the user instance is a managed Entity

At line 1 the user instance is a new Entity

At line 1 a new record will be inserted in the user table

At line 2 the entityManager will immediately reflect user name change to the database

At line 3 the entityManager will immediately reflect user name change to the database

Question: Given the code snippet below, which of the following statements are true?

Choices:

At line 1 the user instance is a managed Entity

At line 1 the user instance is a detached Entity

At line 1 the find method will return null if the input userID is not found

line 3 is mandatory to synchronize the changes done at line 2 to the database

line 4 is mandatory to synchronize the changes done at line 2 to the database

Question: which of the following is NOT a jpa entity manager method?

Choices:

persist

flush

contains

detach

find

Question: In which life cycle state the JPA entity class is synchronized with the database?

Choices:

New

Managed

Synchronized

Detached

Removed

Question: You want to write a JPA Entity class to model a databank table named COOPERATE_USER. Each user is uniquely identified in this table by his or her social security number SSN. Along with SSN the system keeps user name, job, address and birth date. How to declare such JPA Entity class?

Choices:

Write a CooperateUser public class

Annotate the CooperateUser class with @Table(name=" COOPERATE_USER")

Annotate the CooperateUser class with @Entity

The CooperateUser class must implement Serializable

Define private attributes ssn, job, name, addess and birthdate

Annotate the ' name' attibute with @Id

Question: Which method of the jpa entity manager would you use to force synchronizing the persistence context from the database?

Choices:

synchronize()

flush()

refresh()

persist()

Question: How to declare JPA Entity class?

Choices:

Write a private final Entity class named after the mapped table

Annotate the class with @Entity

Annotate the primary key attribute or its getter method with @Id

Define private attributes to map the table columns

Write the finalize method

Question: What are the possible state transitions for an Entity instance ?

Choices:

from managed to detached

from detached to removed

from detached to new

from new to detached

from managed to removed

Question: What is the impact of marking an attribute in a JPA Entity class with @Transient annotation?

Choices:

This attribute will should not be serialized by the EJB container

This attribute will should not be persisted by the EJB container

This attribute will should not be garbage collected by the EJB container