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Oracle Java EE 6 Java Persistence API Developer Certified Expert Sample Questions:

Question 1

The developer has modeled student interests as a set <String>:
@Entity public class Student {
@Id int student Id;
string name;
@ElementaryCollection
Set <String> Interests;
. . .
}
The developer wants the values of this set to be stored using a column named student_intersets.
Select the item below that accomplishes this task:

A. @ElementaryCollection @Column(name = "student_interests") Set <string> interests;
B. @ElementaryCollection @CollectionTable (column = @column(name = "student_interests")) Set <String> interests;
C. @ElementaryCollection (column = "student_intersets") Set<String> interests;
D. @ElementaryCollection @CollectionTable (column = "student_intersets") Set<String> interests;

Question 2

The developer is creating a Java Persistence model for a legacy database. The database contains customer and subscriptions.
The subscriptions table has a foreign key to the Customer table, a foreign key to the magazines table, and a column that stores a java.util.Date (the subscription expiration date).
The developer wants to create entities Customer and subscription to model these tables and to represent the relationship between customer and subscription as a java.util.Map.
Which one of the following fields of the Customer entity accomplishes this task?

A. @ElementaryCollection
@CollectionTable (Name = "Subscriptions")
@Temporal (TemporalType.DATE)
Map<magazine, date> subscriptions
B. @ElementaryCollection
@CollectionTable (name = "subscriptions")
Map <Magazine, Data> subscriptions
C. @OneToMany
@joinColumn (name = "Customer - FK")
Map <Magzine, Data> subscriptions;
D. @ElementaryCollection
Map <Magzine, Data> subscriptions
E. @OneToMany
@JoinTable (name = "Subscriptions")
Map <Magzine, Data> subscriptions;

Question 3

Consider the following web application:

Here MyEntity1.class and MyEntity2.class are annotated with @Entity and MyEmbeddable1-class and MyEmbeddable2-class are annotated with @Embeddable. MyPU is container managed. Which of the following represents set of classes considered managed by MyPU?

A. MyEntity1, MyEmbeddable1, MyEntity2, and MyEmbeddable2
B. MyEntity1, and MyEmbeddable1
C. MyEntity1, MyEmbeddable1, and MyEntity2
D. MyEntity1 and MyEntity2

Question 4

FooBean and BarBean are both EJB 3.0 stateless beans with container-managed transaction demarcation. All business methods in FooBean have transaction attribute REQUIRED, and all business methods in BarBean have transaction attribute REQUIRED_NEW. The business method foo in FooBean invokes the Business method bar in BarBean.
Given:
10.
Public class BarBean {
11.
public void bar () {
12.
throw new RuntimeException ("unexpected error . . . ");
13.
}}
Which is true about the method of invocation assuming execution reaches line 12?

A. The BarBean bean instance is in ready state for the next invocation.
B. FooBean.foo method receives javax -ejb. EJBTtansactionRolledbackException.
C. FooBean.foo method receives the original RuntimeException thrown from BarBean.bar method.
D. FooBean.foo method receives javax.ejb.EJBException.

Question 5

A session bean business method invokes UserTransaction.setRollbackonly and receives an IllegalStateException.
Under which circumstance can this happen?

A. The setRollbackOnly method is invoked within a bean-managed transaction, and userTransaction.commit has NOT been invoked.
B. The bean is using bean managed transaction demarcation, and uaerTransaccion.begin has been invoked.
C. The bean is using bean-managed transactions regardless of whether there is an active transaction.
D. There is no circustance that would cause setRollbackOnly to throw an IllegalStateException.

Solutions: