Oracle Oracle Certifications 1Z0-900 Questions & Answers

• Question 81:

  Which statement is true about the relationship between HTTP and WebSockets?

  A. A WebSocket connection is a bi-directional HTTP session with message-handling support.

  B. A WebSocket connection is initialized with an HTTP handshake.

  C. A WebSocket connection can be initialized by either client or server.

  D. A WebSocket connection uses HTTP protocol to exchange data with the browser.

  Correct Answer: D

• Question 82:

  Given:

  

  Which annotation do you use on line 1 to ensure that clients immediately time out when attempting to concurrently invoke callMethod () while another client is already accessing the bean?

  A. @AccessTimeout (value = 1, unit = TimeUnit.SECONDS)

  B. @AccessTimeout (null)

  C. @AccessTimeout (-1)

  D. @AccessTimeout (0)

  Correct Answer: D

  Reference: http://tomee.apache.org/examples-trunk/access-timeout/

• Question 83:

  Which is a valid description of REST?

  A. REST provides the same architectural properties as SOAP.

  B. REST is a library that is part of JEE called JAX-RS.

  C. REST is the conventional way of interacting with information resources.

  D. REST is a Web Services standard supported by JEE and JAX-RS.

  Correct Answer: D

  Reference: https://docs.oracle.com/javaee/6/tutorial/doc/giepu.html

• Question 84:

  Given the code fragment:

  

  Assuming this bean is used only in the code fragment above, how long will the injected Bean instance be available?

  A. for the lifetime of the enterprise application

  B. for the lifetime of the request

  C. for the lifetime of the session

  D. for the lifetime of the Service object

  Correct Answer: D

• Question 85:

  You want to allow one set of roles to POST to a resource and another set of roles to GET it.

  Which two configuration options should you use? (Choose two.)

  A. two separate @HttpMethodConstraints annotations and sets of roles

  B. a single @HttpMethodContstraint annotation and a map of method to roles

  C. two with different in the deployment descriptor

  D. a single with two with different in the deployment descriptor

  Correct Answer: BD

• Question 86:

  Your class requires multiple resources defined, as shown in the following:

  

  Which annotation do you use to group multiple @Resource declarations together for class-based injection, replacing in the code above?

  A. @Resources

  B. @Resource

  C. @ResourceGroup

  D. @ResourceCollection

  Correct Answer: B

• Question 87:

  Your web application requires logic to remember items that a user placed into a shopping cart.

  Which two mechanisms should you use to associate that information with the user? (Choose two.)

  A. HttpServletResponse objects

  B. ServletContext objects

  C. HttpSession objects

  D. a database

  Correct Answer: BC

• Question 88:

  Given: What will be the response to a HEAD request?

  

  A. The findAll() method will be called and the employee list will be returned.

  B. The findAll() method will be called and no employees will be returned.

  C. No method will be invoked and no error will be returned.

  D. No method will be invoked and a 404 error will be returned.

  Correct Answer: C

• Question 89:

  You are building the User Preferences page of an application. A user can change values, such as his or her name, password, address, company, and so on. These values are sent to a CDI backing bean via AJAX when the user tabs out of each field. However, the values must be retained in the CDI bean and stored in the database only when the user clicks the Save button.

  Which two scopes will allow your CDI bean to retain its state while the user is interacting with the User Preferences page? (Choose two.)

  A. Dependent

  B. View

  C. Session

  D. Request

  E. Application

  Correct Answer: CD

• Question 90:

  Identify two valid WebSocket message types for which you can register handlers. (Choose two.)

  A. Error Message

  B. Binary Message

  C. Pong Message

  D. Ping Message

  Correct Answer: BC

  Reference: https://docs.oracle.com/javaee/7/api/javax/websocket/Session.html