Oracle Oracle Certifications 1Z0-860 Questions & Answers

• Question 251:

  A developer wants to create a Java Persistence query to perform a bulk update operation on five different entity classes. All of these classes have a field called name. These classes have the following relationships: Harrier extends Dog and Dog extends Animal Vet extends Doctor What is the minimum possible number of operations required to change the value of the name field for all of the entities in all five classes?

  A. 1

  B. 2

  C. 3

  D. 4

  E. 5

  Correct Answer: B

• Question 252:

  Which Java Persistence query uses the aggregate function correctly, assuming that chairs field is of type int?

  A. SELECT ANY(r. chairs) FROM Room r

  B. SELECT NEW Integer(MAX(r. chairs)) FROM Room r

  C. SELECT r FROM Room r WHERE r.chairs > AVG(r.chairs)

  D. SELECT c FROM Chair c WHERE LOCATE (c.type, lazyboy) > -1

  Correct Answer: B

• Question 253:

  A session bean's business method throws an exception during execution. Which two are responsibilities of the Bean Provider when throwing the exception? (Choose two.)

  A. For application exceptions, ensure that if the current transaction commits there will be no loss of data integrity.

  B. For application exceptions, ensurethatthe current transaction will commit.

  C. For system errors, when the client is remote, throw a java.rmi.RemoteException that wraps the original exception.

  D. For checked exceptions from which the bean cannot recover, throw an EJBException that wraps the original exception.

  Correct Answer: AD

• Question 254:

  EJB 3.0 containers must provide a specific subset of which two APIs? (Choose two.)

  A. JSP APIs

  B. JavaMailAPIs

  C. JAX-WS APIs

  D. Java CardAPIs

  E. Sun Studio APIs

  Correct Answer: BC

• Question 255:

  Given the following code in an EJB 3.0 session bean:

  10.

  @Resource(name="jdbc/employeeDB")

  11.

  private DataSource dataSource;

  12.

  13.

  public void lookupEmployee(String id) {

  14.

  InitialContext ic = new InitialContextO;

  15.

  // insert code here

  16.

  DataSource ds = (DataSource) obj;

  17.}

  Which code, inserted at Line 15, portably looks up the injected resource?

  A. Object obj = ic.lookup("employeeDB");

  B. Object obj = ic.lookup("dataSource");

  C. Object obj = ic.lookup("jdbc/employeeDB");

  D. Object obj = ic.lookup("javacomp/env/employeeDB");

  E. Object obj = ic.lookup("java:comp/env/jdbc/employeeDB");

  Correct Answer: E

• Question 256:

  Given code snippets from two files:

  7.

  public class Dog {

  8.

  public void onMessage(Message m) { System, out. print("1 ");

  9.

  1

  And

  10.

  @MessageDriven

  11.

  class MessageDog extends Dog implements MessageDrivenBean

  12.

  MessageDog(Message m){ System, out. print("2 "); } 13.}

  Which four code changes, when used together, create a valid JMS message-driven bean? (Choose four.

  A. Make class MessageDog public.

  B. Make the MessageDog constructor no-arg.

  C. Make the MessageDog constructor public.

  D. Move the onMessage method to class MessageDog.

  E. Change MessageDog so that it is NOT a subclass of Dog.

  F. Make class MessageDog implement MessageListener instead of MessageDrivenBean.

  Correct Answer: ABCF

• Question 257:

  A developer writes a stateless session bean FooBean with one remote business interface FooRemote containing one business method foo. Method foo takes a single parameter of application-defined type MyData.

  11.

  public class MyData implements Java. io.Serializablej

  12.

  int a; 13.}

  Method foo is implemented within the FooBean class as:

  11.

  public void foo(MyData data) {

  12.

  data.a = 2; 13.}

  Another session bean within the same application has a reference to FooRemote in variable fooRef and calls method foo with the following code:

  11.

  MyData data = new MyDatafJ;

  12.

  data.a = 1;

  13.

  fooRef.foo(data);

  14.

  System, out. println(data. a);

  What is the value of data, a when control reaches Line 14 of the client ?

  A. 0

  B. 1

  C. 2

  D. either1or 2

  Correct Answer: B

• Question 258:

  A session bean calls the setRollbackOnly method on the EJBContext interface within a business method with an active transaction. Which two are correct? (Choose two.)

  A. The transaction timeout is immediately disabled.

  B. The container will ensure that the transaction will never commit.

  C. The bean must have started the current transaction for this to be legal.

  D. The bean must have bean-managed transaction demarcation for this to be legal.

  E. Thebean must have container-managed transaction demarcation for this to be legal.

  Correct Answer: BE

• Question 259:

  Which statement about entity manager is true?

  A. A container-managed entity manager must be a JTA entity manager.

  B. An entity manager injected into session beans can use either JTA or resource-local transaction control.

  C. An entity manager created by calling the EntityManagerFactory.createEntityManager method always uses JTA transaction control.

  D. An entity manager obtained through resource injection in a stateful session bean can use a resource-local EntityTransaction for transaction control

  Correct Answer: A

• Question 260:

  A Java Persistence application uses a Version attribute to manage concurrent updates. Which is true?

  A. The Version attribute must have a public access type.

  B. The Version attribute is used by the persistence provider.

  C. A separate Version attribute must be specified for each class in the inheritance hierarchy.

  D. A separate Version column must be specified for each table mapped to the entity.

  Correct Answer: B