Java EE 7 Application Developer

Here you have the best Oracle 1z0-900 practice exam questions

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This questions were last updated on October 23, 2025
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Question 1 of 142

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?

Create two @onMessage methods in the same endpoint with appropriate parameter types.

Define the @onMessage methods in your endpoint with Object as parameter and check the actual type in your code.

You can achieve this only by creating separate WebSocket endpoints for each message type.

Create two @onMessage methods, each with appropriate decoder attribute in the same endpoint.

Correct Answer: D

To configure a WebSocket endpoint to receive both text and binary messages, you should create two @onMessage methods, each with appropriate decoder attributes in the same endpoint. This allows the endpoint to handle both types of messages correctly by specifying how each type should be decoded, thereby ensuring proper handling of both text and binary data.

Question 2 of 142

Which two capabilities are provided by the Java Authentication and Authorization Services (JAAS) API? (Choose two.)

protecting data from unauthorized viewing by using encryption

verifying that a user is allowed to perform an action

ensuring that data is not modified in transit

verifying identity claims from users

Correct Answer: B, D

The Java Authentication and Authorization Services (JAAS) API provides capabilities for verifying that a user is allowed to perform an action and for verifying identity claims from users. These are essential aspects of authentication (verifying identity claims) and authorization (determining permissions to perform actions). Encryption and ensuring data integrity are not primary functions of JAAS.

Question 3 of 142

Which interface should you implement if you want to be alerted to the lifecycle events surrounding your task being executed by a ManagedExecutorService?

the Runnable Interface

the ManagedExecutorTask interface

the TaskEventListener interface

the ManagedTaskListener interface

Correct Answer: D

Question 4 of 142

Given the code fragment:
Exam 1z0-900: Question 4 - Image 1

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

<base url>/Employees/89724

<base url>/Employees/J6349

<base url>/Employees/id:a7280

<base url>/Employees/id/J6349

Correct Answer: B

The `@Path` annotation in the given code fragment specifies that the path must match the pattern "{id:[A-Z][0-9]+}". This means the URL must contain an 'id' value that starts with an uppercase letter followed by one or more digits. Therefore, the correct URL that triggers the invocation of the getEmployee() method is /Employees/J6349, making option B correct.

Question 5 of 142

What is true about Message-Driven Beans (MDBs)?

MDBs can participate in transactions.

MDBs are invoked synchronously.

Each MDBs can process messages only from a single client.

MDBs retain data caches between client calls.

Correct Answer: A

Message-Driven Beans (MDBs) can indeed participate in transactions. They are designed to handle messages asynchronously and can be part of a transaction, ensuring that the procedure either completes successfully or fails entirely, maintaining data integrity. Other options are incorrect as MDBs are invoked asynchronously (not synchronously), can handle messages from multiple clients (not just one), and do not retain data caches between client calls.