Oracle 1Z0-898 問題集

質問 1：
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. FooBean.foo method receives javax.ejb.EJBException.
B. The BarBean bean instance is in ready state for the next invocation.
C. FooBean.foo method receives the original RuntimeException thrown from BarBean.bar method.
D. FooBean.foo method receives javax -ejb. EJBTtansactionRolledbackException.
正解：A

質問 2：
Which of the following Criteria query snippets demonstrates the correct way to create and execute strongly typed queries? Assume that cb references an instance of the CriteriaBuilder interface and em references an EntityManager instance.
A. CriteriaQuery<office> cq = em.createQuery (cq, office.class);
. . .
TypedQuery<Office> tq = em.createQuery (cq);
List <office> offices = tq.getresult ();
B. CriteriaQuery <office> cq = cb.createQuery (Office.class);
. . .
TypedQuery<Office> tq = em.ceateQuery (cq) ; L
1st <office> offices = tq.getResultList ();
C. CriteriaQuery <office> cq = cb.createQuery (Office.class);
. . .
TypedQuery<Office> tq = em.ceateQuery (cq);
List<office> Offices = tq.getResultList ();
D. CriteriaQuery cq = cb.createQuery (Office.class)
. . .
TypedQuery<office> tq = em.createQuery (cq, office.class);
List <office> offices = tq.getresult ();
正解：C
解説: (Topexam メンバーにのみ表示されます)

質問 3：
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)
A. Method doB will never be called.
B. The current transaction will be marked for rollback when doB is called.
C. The current transaction will be marked for rollback when doA is called.
D. The current transaction will continue after doB executes.
E. The current transaction will continue after doA executes.
正解：B,D

質問 4：
Entity lifecycle callback methods may be defined in which three classes? (Choose three)
A. Entity classes
B. Mapped superclasses
C. Abstract classes
D. Concrete non-entity superclasses
E. Embedded classes
F. Entity listener classes
正解：A,B,F
解説: (Topexam メンバーにのみ表示されます)

質問 5：
An application creates a TypedQuery object to perform a query, and sets the query object's flush mode by calling setFlushMode (FlushModeType.commit). The query is executed within a transaction.
Which of the following is true?
A. Updates to the database tables may occur anytime during the transaction associated with the query.
B. Changes to the entities in this transaction cannot be flushed to the database until the transaction commits.
C. Updates to the entities that can affect the outcome of the query cannot be flushed to the database until the transaction commits.
D. setFlushMode cannot be called on a TypedQuery object.
正解：B

質問 6：
An application has two entities, Department and Employee, and there is a one-to-many relationship between them. The application has the following query:
SELECT d
FROM Department d LEFT JOIN FETCH d. employees
WHERE d.name = : name
After receiving the results of the query, the application accesses the returned department's Employee entities stored in the Department.employees collection-valued attribute.
All caching has been turned off in the application.
Which statement is true?
A. The database will be accessed once during the query execution phase, once when the Department. Employees collection-valued attribute is used, and once for each employee entity in the Department.employees.
B. The database will be accessed once during the query execution phase, and once when the department.employees collection-valued attribute is used.
C. The database will be accessed once during the query execution phase, and once for each Employee entity in Department - employees.
D. The database will be accessed once during the query execution phase ONLY.
正解：B