Free Practice Questions for Oracle 1Z0-900 Exam

Question 1

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

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

BA WebSocket connection is initialized with an HTTP handshake.

CA WebSocket connection can be initialized by either client or server.

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

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

Question 2

Given the following class definition with numbered lines:

How do you specify to use this mock CDI bean implementation instead of the regular implementation class?

AUse the alternatives element in the beans.xml file and specify the class name in the class element within it.

BStart up the server with the optional --alternative command-line option, specifying any alternative class names in a comma-separated list.

CReorder the implementation names in the beans.xml file such that the desired alternative is listed earlier.

DDelete the regular implementation class from the WAR.

Correct Answer: B. Start up the server with the optional --alternative command-line option, specifying any alternative class names in a comma-separated list.

Question 3

Which code snippet prints the exception error message as part of the page output?

A<%= exception.message %>

B<c:out value=''${requestScope['javax.servlet.error.exception']}''/>

C<% exception.getMessage(); %>

D<% System.out.println(e.getMessage()) %>

Correct Answer: D. <% System.out.println(e.getMessage()) %>

Question 4

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

AServletContext

BHttpSession

CServletRequest

DServletConfig

Correct Answer: A. ServletContext

Question 5

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?

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

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

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

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

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

Question 6

Which statement is true about Java methods that are exposed as Web Service operations by using JAX-WS API?

AThe @WebResult annotation must exist.

BMethod parameters and return types must be JAXB compatible.

CMethod parameters must be declared by using @WebParam.

DThe @WebMethod annotation must exist.

Correct Answer: D. The @WebMethod annotation must exist.

Question 7

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.)

ADependent

BView

CSession

DRequest

EApplication

Correct Answer: C. Session; D. Request

Question 8

Given a JSL document describing a batch job:

How do you initiate a batch job?

AGet the JobExecution object from BatchRuntime and call its start() method.

BGet the JobExecution object from BatchRuntime and set its status to JobStatus.INITIATED.

CGet the JobOperator object from BatchRuntime and call its start() method.

DCall BatchRunTime.initialize(''ProductLoadJob'');

Correct Answer: A. Get the JobExecution object from BatchRuntime and call its start() method.

Question 9

Given the code fragment:

Which URL triggers the invocation of the getEmployee () method?

A<base url>/Employees/89724

B<base url>/Employees/J6349

C<base url>/Employees/id:a7280

D<base url>/Employees/id/J6349

Correct Answer: A. <base url>/Employees/89724

Question 10

Which annotation allows a request to be executed with another Principal's identity?

AIt is not possible to execute a request with another Principal's identity.

B@UseIdentity

C@RolesAllowed

D@Runs

Correct Answer: C. @RolesAllowed