Oracle Oracle Certifications 1Z0-900 Questions & Answers

• Question 111:

  Given:

  

  You are creating an Alarm management system. When you create a new alarm, you want it to create an alert that is triggered once at the specified time.

  Which method should you call on Line 9 to create the timer?

  A. timerService.createCalendarTimer(alarmDate, config);

  B. timerService.createSingleActionTimer(alarmDate, config);

  C. timerService.createIntervalTimer(alarmDate, -l, config);

  D. timerService.createTimer(alarmDate, -l, config);

  Correct Answer: D

  Reference: https://docs.oracle.com/javaee/6/api/javax/ejb/TimerService.html

• Question 112:

  Given the code sample:

  

  And: And:

  

  

  And the next fragment from beans.xml:

  

  And this injection point:

  @Inject GenericMessenger messageHandler;

  Which type would be injected at run time and referenced by the messageHandler variable?

  A. SmsHandler

  B. MsgHandler

  C. None of the above. An exception would be thrown due to ambiguous bean references.

  D. GenericMessenger

  Correct Answer: D

• Question 113:

  On your JSF page, you have a form in which you have a command button:

  

  A user submits the form by clicking the button, and no errors occur while processing the request. Which statement is true?

  A. The actNow() and ListenCarefully() methods are executed in parallel.

  B. The listenCarefully() method is executed followed by the actNow() method.

  C. The actNow() method controls the condition upon which the listenCarefully() method is allowed to be executed.

  D. The actNow method is executed followed by the listenCarefully() method.

  Correct Answer: B

• Question 114:

  Which type allows you to share servlet attributes across your entire web application?

  A. ServletContext

  B. HttpSession

  C. ServletRequest

  D. ServletConfig

  Correct Answer: A

  Reference: https://stackoverflow.com/questions/123657/how-can-i-share-a-variable-or-object-betweentwo-or-more-servlets

• Question 115:

  Given:

  

  Which client-side Java method will send the employee object to the WebSocket Server Endpoint?

  A. session.post(employee);

  B. container.send(employee);

  C. session.send(employee);

  D. remote.sendObject(employee);

  Correct Answer: A

• Question 116:

  You are working with JMS publish-subscribe operations.

  What happens when a producer publishes a message to a topic for which a durable subscription exists but there are no subscribers available?

  A. The publisher waits for a subscriber, who then consumes it. However, the publisher will time out if no consumer arrives within the given timeout period.

  B. The publisher sends the message. However, it is never consumed because there wasn't anything listening when it arrived, regardless of the message timeout length.

  C. The publisher successfully sends a message, which will be consumed later, once there is a subscriber, assuming the message hasn't timed out.

  D. The message publisher is immediately notified about the lack of subscribers and can decide for itself if, and when, to resend.

  Correct Answer: C

  Reference: https://www.ibm.com/support/knowledgecenter/en/SSAW57_8.5.5/ com.ibm.websphere.nd.multiplatform.doc/ae/tjn0012_.html

• Question 117:

  Given the code fragment:

  

  How are transactions managed?

  A. through a single shared transaction across the connection factory

  B. through a separate transaction per JMS Consumer C. through a single transaction for the entire JMS Topic

  D. through a single shared transaction in the JMS Context

  Correct Answer: D

• Question 118:

  You need to exchange large binary messages using chunks in a WebSocket application. Identify two ways in which you can receive partial messages. (Choose two.)

  A. Define an @OnMessage method with a single MimePart parameter.

  B. Use a ChunkListener interface implementation.

  C. Use a MessageHandler.Partial interface implementation.

  D. Define an @OnMessage method with byte [] as the first parameter and a boolean as the second parameter.

  Correct Answer: CD

  Reference: https://abhirockzz.gitbooks.io/java-websocket-api-handbook/content/Receiving% 20Messages.html

• Question 119:

  Given the code fragments: Which action completes this composite primary key implementation?

  

  A. Add @IdClass annotation at line 1.

  B. Add @Embeddable annotation at line 1 and replace both @Id annotations with @EmbeddedId annotations.

  C. Add @IdClass(ContactId.class) annotation at line 2.

  D. Add @Embeddable annotation at line 1 and @EmbeddedId(ContactId.class) at line 2.

  Correct Answer: D

• Question 120:

  Given the code fragment:

  

  How can you apply DateConverter to the birthday field?

  A. by adding @Convert(to=Date.class) at line 3

  B. by invoking the setConverter(DateConverter.class) method on the EntityManager object

  C. by adding @Converter(autoApply=true) at line 1

  D. by adding @Convert((DateConverter.class)) at line 2

  Correct Answer: A