Download Java EE 7 Application Developer.1z0-900.Prep4Sure.2020-06-02.85q.tqb

Vendor: Oracle
Exam Code: 1z0-900
Exam Name: Java EE 7 Application Developer
Date: Jun 02, 2020
File Size: 2 MB
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Demo Questions

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. Create two @onMessage methods in the same endpoint with appropriate parameter types.
  2. Define the @onMessage methods in your endpoint with Object as parameter and check the actual type in your code.
  3. You can achieve this only by creating separate WebSocket endpoints for each message type.
  4. Create two @onMessage methods, each with appropriate decoder attribute in the same endpoint.
Correct answer: A
Question 2
Which interface should you implement if you want to be alerted to the lifecycle events surrounding your task being executed by a ManagedExecutorService?
  1. the Runnable Interface
  2. the ManagedExecutorTask interface
  3. the TaskEventListener interface
  4. the ManagedTaskListener interface
Correct answer: D
Explanation:
Reference: https://github.com/javaee/concurrency-ee-spec/blob/master/api/src/main/java/javax/enterprise/concurrent/ManagedExecutorService.java
Reference: https://github.com/javaee/concurrency-ee-spec/blob/master/api/src/main/java/javax/enterprise/concurrent/ManagedExecutorService.java
Question 3
What is true about Message-Driven Beans (MDBs)?
  1. MDBs can participate in transactions.
  2. MDBs are invoked synchronously.
  3. Each MDBs can process messages only from a single client.
  4. MDBs retain data caches between client calls.
Correct answer: A
Explanation:
Reference: https://docs.oracle.com/javaee/7/tutorial/ejb-intro003.htm
Reference: https://docs.oracle.com/javaee/7/tutorial/ejb-intro003.htm
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