Oracle Oracle Certifications 1Z0-860 Questions & Answers

• Question 151:

  Which statement about the JoinTable annotation is true?

  A. It must be applied to a unidirectional many-to-one association.

  B. It can be applied to the owning side of a many-to-many association.

  C. It must be applied to the owning side of a unidirectional one-to-many association.

  D. If the name attribute is not specified it is derived from the names of the primary keys of the two entities involved in the association.

  Correct Answer: B

• Question 152:

  A developer is creating a long-running Java Persistence reporting application that accesses a set of related entities. The application is NOT expected to add, change, or remove records in the database but the data can be changed by another application running on the same database. Which option will guarantee that the report does NOT contain stale data?

  A. CalltheEntityManagerflush API before preparing the report.

  B. CalltheEntityManager createOueryAPIbeforepreparingthe report.

  C. Call the EntityManager clearAPIbefore accessing thefieldsor properties of the entities used in the report.

  D. CalltheEntityManager refresh on each parent entity that is added to the report, and specify cascade=REFRESH onallcorresponding relationships.

  Correct Answer: D

• Question 153:

  A developer has obtained a container-managed entity manager with transaction scoped persistence context. Assume there is no persistence context associated with the entity manager. When does a new persistence context begins?

  A. whenaJTA transaction begins

  B. when the entity manager is created

  C. whenthe entitymanageris invoked in the scope of an active JTA transaction

  D. when theentitymanager is created inthe scopeof an active resource local transaction

  Correct Answer: C

• Question 154:

  Which statement is true about both stateful session beans and stateless session beans?

  A. Bean instances are NOT required to survive container crashes.

  B. Any bean instance must be able to handle concurrent invocations from different threads.

  C. A bean with bean-managed transactions must commit or roll back any transaction before returning from a business method.

  D. The container passivates and activates them using methods annotated with @PrePassivate and @PostActivate annotations.

  Correct Answer: A

• Question 155:

  A developer implements a system in which transfers of goods are monitored. Each transfer needs a unique ID for tracking purposes. The unique ID is generated by an existing system which is also used by other applications. For perfomance reasons, the transaction that gets the unique ID should be as short as possible. The scenario is implemented in four steps which are implemented in four business methods in a CMT session bean: LcheckGoods Checks goods in a database 2.getUniqueld Retrieve the unique ID 3.checkAmount Checks the amount in a non-transactional system 4.storeTransfer Stores the transfer in a database as part of the calling transaction. These methods are called by the addTransfer method of a second CMT session bean in the following order: checkGoods, getUniqueld, checkAmount, storeTransfer Assuming no other transaction-related metadata, which is the correct set of transaction attributes for the methods in the session beans?

  A. 0.addTransfer REQUIRED 1.LcheckGoods REQUIRED 2.getUniqueldREQUIRES_NEW

  3.

  checkAmountsNOT_SUPPORTED

  4.

  storeTransferMANDATOR Y

  B. 0.addTransferREQUIRED 1.LcheckGoods REQUIRED 2.getUniqueldREQUIRED 3.checkAmountsREQUIRED

  4. storeTransferREQUIRED

  C. 0.addTransferREQUIRED 1.LcheckGoods REQUIRED 2.getUniqueldREQUIRES_NEW

  3.

  checkAmountsNEVER

  4.

  storeTransferMANDATOR Y

  D. 0.addTransferNOT_SUPPORTED 1.LcheckGoodsREQUIRED 2.getUniqueldREQUIRED

  3. checkAmountsNOT_SUPPORTED

  4.storeTransferMANDATOR Y

  Correct Answer: A

• Question 156:

  Which three roles will typically edit an ejb-jar? (Choose three.)

  A. Deployer

  B. EJBServer Provider

  C. PersistenceProvider

  D. System Administrator

  E. ApplicationAssembler

  F. EnterpriseBeanProvider

  Correct Answer: AEF

• Question 157:

  A developer wants to create a portable EJB 3.0 application that includes the following class definition for the Entity Account: 11.©Entity

  12.

  @Entityl_isteners(com. acme.AlertMonitor. class)

  13.

  public class Account {

  14.

  // more code here

  15.

  @PrePersist

  16.

  protected void validateCreate0 {/* more code here */} 17.} Which statement is correct?

  A. The validateCreate method may NOT throwruntimeexceptions.

  B. ThevalidateCreate method can invoke the EntityManager.flush operation.

  C. Methods oftheclass com.acme.AlertMonitor annotatedwithcallback annotationsmusttake an Object or Account instance astheonly argument.

  D. The above class definition is NOT correct. An entity cannot defineacallback methodlike PrePersistand use the EntityListeners annotationatthe same time.

  Correct Answer: C

• Question 158:

  A developer is working with an entity User, which has an identity field and a salary field. Which Java Persistence query will return those users with the highest salaries?

  A. SELECT u FROM User u WHERE u.salary >= ALL (SELECT d.salary FROM User d)

  B. SELECT u FROM User u WHERE u.salary >= ANY (SELECT d.salary FROM User d)

  C. SELECT u FROM User u WHERE ALL(u.salary >= (SELECT d.salary FROM User d))

  D. SELECT u FROM User u WHERE u.salary >= (SELECT ALL(d.salary) FROM User d)

  Correct Answer: A

• Question 159:

  Which method always throws an exception when invoked on a container-managed entity manager?

  A. the lock method

  B. theclosemethod

  C. theflush method

  D. the clear method

  Correct Answer: B

• Question 160:

  A developer writes a stateful session bean with local business interface Bar containing method test. Method test is implemented as

  11. ©Remove

  12. public void testfj {}

  A business method in a stateless session bean invokes a reference to bean Bar as follows :

  11. @EJB Bar bar;

  12.

  13. public void foo0 {

  14. bar.testO;

  15. bar.testO;

  16.}

  Assuming execution reaches Line 15, what is the expected result?

  A. Method foo returns withouterror.

  B. Ajavax.ejb.NoSuchEJBException is thrown.

  C. Ajava.rmi.NoSuchObjectException is thrown.

  D. Ajavax.ejb.NoSuchEntityException is thrown.

  Correct Answer: B