Oracle Oracle Certifications 1Z0-860 Questions & Answers

• Question 71:

  Which two statements are true about EJB 3.0 session bean transaction management? (Choose two.)

  A. All session beans in the same ejb-jar must have the same transaction demarcation type.

  B. All session beans in the same enterprise application archive must have the same transaction demarcation type.

  C. Session beans with bean-managed transaction demarcation cannot participate in a two-phase commit procedure.

  D. Session beans with bean-managed transaction demarcation can use transactional resources managed by the container.

  E. Session beans that invoke javax. persistence. EntityManager can use either containermanaged transaction demarcation or bean-managed transaction demarcation.

  Correct Answer: DE

• Question 72:

  A developer's objective is to end the persistence context associated with an application- managed entity manager. Which statement is correct?

  A. Invoke the flush method of theentitymanager.

  B. Invoke the close method of the entity manager.

  C. Invokethe clear methodofthe entity manager.

  D. Invoke the remove method of the entity manager.

  Correct Answer: B

• Question 73:

  Which statement is true about the Timer service in an EJB 3.0 stateless session bean?

  A. The timeout callback method contains the business logic that handles the timeout event.

  B. The timeout callback method must be declared as a business method in business interfaces.

  C. The timeout callback method can throw application exceptions to report business logic failures.

  D. A bean class can implement multiple timeout callback methods, each associated with a different timer.

  Correct Answer: A

• Question 74:

  A developer is working on a user registration application using EJB 3.0. A business method registerUser in stateless session bean RegistrationBean performs the user registration. The registerUser method executes in a transaction context started by the client. If some invalid user data causes the registration to fail, the client invokes registerUser again with corrected data using the same transaction. Which design can meet this requirement?

  A. Have registerUser method call EJBContext.setRollbackOnlyOmethodafter registration fails.

  B. Have registerUser method throw javax.ejb.EJBTransactionRequiredExceptionafterregistration fails.

  C. HaveregisterUser method throw EJBException without marking the transaction for rollback, after registration fails.

  D. Create an application exception withtherollbackattributeset to falseandhave registerUser method throwit afterregistration fails.

  Correct Answer: D

• Question 75:

  Which statement is true about the Timer service in an EJB 3.0 stateless session bean?

  A. The timeout callback method contains the business logic that handles the timeout event.

  B. The timeout callback method must be declared as a business method in business interfaces.

  C. The timeout callback method can throw application exceptions to report business logic failures.

  D. A bean class can implement multiple timeout callback methods, each associated with a different timer.

  Correct Answer: A

• Question 76:

  Given:

  11.

  @PersistenceContext EntityManager em;

  12.

  public boolean test(Order o) {

  13.

  boolean b = false;

  14.

  o = em.merge(o);

  15 em.remove(o);

  16.

  o = em.merge(o);

  17.

  b = em.contains(o);

  18.

  return b;

  19.}

  Which statement is correct?

  A. The method will return TRUE.

  B. Themethod will return FALSE.

  C. Themethodwill throw an exception.

  D. TheOrder instance willberemoved from the database.

  Correct Answer: C

• Question 77:

  Given a stateless session bean with container-managed transaction demarcation, from which two methods can a developer access another enterprise bean? (Choose two.)

  A. beanconstructor

  B. Timeout callback method

  C. PreDestroy lifecycle callback method

  D. PostConstruct lifecycle callback method

  E. businessmethod fromthebusiness interface

  Correct Answer: BE

• Question 78:

  Which statement about the @MappedSuperclass annotation is correct?

  A. A class annotated with @MappedSuperclass must be abstract.

  B. Subclasses of entity classes cannot be annotated with @MappedSuperclass.

  C. A class annotated with @MappedSuperclass has no separate table defined for it.

  D. A class annotated with @MappedSuperclass can be the target of queries like any other entity class.

  Correct Answer: C

• Question 79:

  Which two are true about EJB 3.0 exception classes? (Choose two.)

  A. The javax.ejb.NoSuchEJBException is an application exception.

  B. The javax.ejb.EJBException extends Java. lang. RuntimeException.

  C. The javax.ejb.EJBTransactionRequiredException is an application exception.

  D. An application exception must NOT be a subclass of Java.rmi.RemoteException.

  E. The javax.ejb.EJBTransactionRolledbackException is an application exception.

  F. Any subclass of Java.lang.RuntimeException is always considered a system exception.

  Correct Answer: BD

• Question 80:

  A developer wants to use the Java Persistence query language. Which two are true? (Choose two.)

  A. A WHERE clause is required in every query.

  B. The WHERE clause can restrict the scope of a delete operation.

  C. The WHERE clause can be used to order the results returned by a query.

  D. The WHERE clause is used to determine the types of objects to be retrieved from a persistent store.

  E. The WHERE clause is used to restrict the contents of a collection of objects that are returned from a query.

  Correct Answer: BE