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Home Oracle 1z0-900

Oracle 1z0-900 Exam Practice Questions (P. 1)

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Question #1
You need to develop a chat application, which allows the display of emoticons and images together with text messages.
How should you configure a WebSocket endpoints to receive both text and binary messages?
  1. A
    Create two @onMessage methods in the same endpoint with appropriate parameter types.
  2. B
    Define the @onMessage methods in your endpoint with Object as parameter and check the actual type in your code.
  3. C
    You can achieve this only by creating separate WebSocket endpoints for each message type.
  4. D
    Create two @onMessage methods, each with appropriate decoder attribute in the same endpoint.

Correct Answer:
A

Question #2
Which two capabilities are provided by the Java Authentication and Authorization Services (JAAS) API? (Choose two.)
  1. A
    protecting data from unauthorized viewing by using encryption
  2. B
    verifying that a user is allowed to perform an action
  3. C
    ensuring that data is not modified in transit
  4. D
    verifying identity claims from users

Correct Answer:
BD

Question #3
Which interface should you implement if you want to be alerted to the lifecycle events surrounding your task being executed by a ManagedExecutorService?
  1. A
    the Runnable Interface
  2. B
    the ManagedExecutorTask interface
  3. C
    the TaskEventListener interface
  4. D
    the ManagedTaskListener interface

Correct Answer:
D
Reference:
https://github.com/javaee/concurrency-ee-spec/blob/master/api/src/main/java/javax/enterprise/concurrent/ManagedExecutorService.java

Question #4
Given the code fragment:

Which URL triggers the invocation of the getEmployee () method?
  1. A
    <base url>/Employees/89724
  2. B
    <base url>/Employees/J6349
  3. C
    <base url>/Employees/id:a7280
  4. D
    <base url>/Employees/id/J6349

Correct Answer:
B

Question #5
What is true about Message-Driven Beans (MDBs)?
  1. A
    MDBs can participate in transactions.
  2. B
    MDBs are invoked synchronously.
  3. C
    Each MDBs can process messages only from a single client.
  4. D
    MDBs retain data caches between client calls.

Correct Answer:
A
Reference:
https://docs.oracle.com/javaee/7/tutorial/ejb-intro003.htm

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