Oracle 1Z0-860 Online Practice Questions and Exam Preparation

Oracle 1Z0-860 Online Questions & Answers

• Question 181:

  The ejb-jar file format is a contract between which two EJB role pairs? (Choose two.)

  A. Deployer and System Administrator
  B. Application Assembler and Deployer
  C. Bean Provider and Application Assembler
  D. Bean Provider and EJB Container Provider
  E. EJB Server Provider and EJB Container Provider
  F. Application Assembler and EJB Container Provider
  B. Application Assembler and Deployer
  C. Bean Provider and Application Assembler

• Question 182:

  Given the following code snippet from an EJB 3.0 entity class:

  1.

  package com.foo;

  2.

  // more code here...

  10.©Entity

  11.

  @Table(name="A")

  12.

  public class Order {

  And the following excerpt from the persistence unit's orm.xml mapping file:

  10.

  11.

  B. B

  Question 183:

  The Java Persistence API defines a notion of propagation of a persistence context. Which statement is correct?

  A. Persistence context propagation is NOT supported for message-driven beans.
  B. Persistence context propagation is supported for any type of an entity manager.
  C. Persistence context propagation avoids the need for the application to pass references of entity manager instances.
  D. Persistence context propagation results in cloning of all managed instances for use by another instance of an entity manager.

  C. Persistence context propagation avoids the need for the application to pass references of entity manager instances.

  Question 184:

  The Java Persistent API defines certain rules for persistent entities. These rules are required by the persistent provider to manage entities at runtime. Which statement is correct, assuming NO mapping descriptor is used?

  A. Entitiesmust extenda persistent base class.
  B. Entities must implement the interface PersistentEntityto bemanaged bythepersistent provider.
  C. Afield withoutatransient modifier mustbeannotated as ©Persistent to be stored in the database.
  D. A field without a transient modifier must be annotated as ©Transient to NOT be stored in the database.

  D. A field without a transient modifier must be annotated as ©Transient to NOT be stored in the database.

  Question 185:

  Which statement about message-driven beans is correct?

  A. Each message-driven bean instancewill beinvoked onlyone thread ata time.
  B. When dispatching messages to message bean instances the container must preserve the order in which messages arrive.
  C. If a message-driven bean is associated with a JMS queue, each bean instance in the pool will receive each message sent to the queue.
  D. If a message-driven bean is associated with a JMS durable subscription, each bean instance in the pool will receive each message sent to the durable subscription.

  A. Each message-driven bean instancewill beinvoked onlyone thread ata time.

  Question 186:

  A developer is declaring a persistent entity that will be passed as a detached object through a remote interface to an application client. Which two characteristics must the corresponding persistent entity class have? (Choose two.)

  A. implement serializable
  B. includeano-arg constructor
  C. make instance variables public
  D. implement the remote interface

  A. implement serializable
  B. includeano-arg constructor

  Question 187:

  A developer creates a stateful session bean that is used by many concurrent clients. The clients are written by other development teams and it is assumed that these clients might not remove the bean when ending their session. The number of concurrent sessions will be greater than the defined bean cache size. The developer must consider that the state of the session bean can be influenced by either passivation or timeout. Which three actions should the developer take to make the bean behave correctly in passivation and timeout situations? (Choose three.)

  A. Release references to resources ina@Removeannotated method.
  B. Re-establish references to resources in an @lnit annotated method.
  C. Release references to resources ina@PreDestroy annotated method.
  D. Release references to resources in a @PrePassivate annotated method.
  E. Re-establish referencestoresources ina ©PostActivate annotatedmethod.

  C. Release references to resources ina@PreDestroy annotated method.
  D. Release references to resources in a @PrePassivate annotated method.
  E. Re-establish referencestoresources ina ©PostActivate annotatedmethod.

  Question 188:

  A Java Persistence application wants to use optimistic locking. Which statement that describes the functionality of optimistic locking is correct?

  A. The Version attribute of an entity using optimistic locking can be mapped to a secondary table.
  B. Optimistic locking can be used by Java Persistence applications to set optimistic locks on tables in the database.
  C. The Version attribute of an entity using optimistic locking is verified each time the instance is loaded from the database.
  D. Optimistic locking ensures that updates or deletes are consistent with the current state of the database and that intervening updates are not lost.

  D. Optimistic locking ensures that updates or deletes are consistent with the current state of the database and that intervening updates are not lost.

  Question 189:

  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

  B. 2

  Question 190:

  Given:

  11.©Entity public class X{

  12.

  @ld int id;

  13.

  Y y; 14.}

  A public class Y with NO Java Persistence annotations is defined in the same package.

  Which statement is correct about these classes if NO other annotations and mapping descriptors are provided?

  A. Class Y must be serializable.
  B. ClassYmust be marked as an entity.
  C. The entity X is notdefinedcorrectly.The field y must be marked as @Lob.
  D. ClassY must be accessedbyapersistenceapplication throughapublicinterface.

  A. Class Y must be serializable.
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