How Well Do You Know EJB (Enterprise Java Beans)?

2.

What Type of EJB Is Often Used To Run Independent Operations?

Message Driven Beans
Session Bean
Stateless EJB
Stateful EJB

Correct Answer

A. Stateless EJB

Explanation

Stateless EJB is often used to run independent operations because it does not maintain any conversational state between method invocations. This means that each method invocation is independent and does not rely on any previous method invocations. Stateless EJBs are lightweight and can handle multiple client requests concurrently, making them suitable for running independent operations.

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3.

Which of the Following is a Major Requirement When Running EJB?

JDK
Linux
Mac
Windows

Correct Answer

A. JDK

Explanation

When running EJB (Enterprise Java Beans), a major requirement is the JDK (Java Development Kit). The JDK is necessary because it provides the tools and libraries needed to develop and run Java applications, including EJBs. Without the JDK, it would not be possible to compile and execute the EJB code. Therefore, having the JDK installed is crucial for running EJB successfully.

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4.

What EJB Category Acts as a Permanent Data Storage?

Entity Bean
Message Driven Bean
Session Bean
None of the Above

Correct Answer

A. Entity Bean

Explanation

Entity Beans in EJB act as a permanent data storage. They are used to represent persistent data in a database and provide a way to interact with the database through object-oriented programming. Entity Beans have a state that can be stored and retrieved from a database, making them suitable for long-term storage of data. The other options, Message Driven Bean and Session Bean, do not provide permanent storage capabilities and are used for different purposes in EJB.

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5.

Which of the Following is Used by Java Based Applications for Directory Services and Naming?

EJB
J2EE
JAR
JNDI

Correct Answer

A. JNDI

Explanation

JNDI (Java Naming and Directory Interface) is used by Java-based applications for directory services and naming. It provides a way for applications to access and manipulate naming and directory services, such as LDAP (Lightweight Directory Access Protocol) or DNS (Domain Name System). JNDI allows Java applications to look up and bind to objects in a distributed environment, making it easier to locate and access resources like databases, messaging systems, and other services. It acts as a bridge between the application and the directory service, allowing for seamless integration and interoperability.

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6.

Which of the Following is Not One of the ACID Properties?

Atomic
Conditional
Isolated
Durable

Correct Answer

A. Conditional

Explanation

The ACID properties in database management systems stand for Atomicity, Consistency, Isolation, and Durability. These properties ensure that database transactions are reliable and maintain data integrity. Atomicity guarantees that a transaction is treated as a single unit of work, either all of its operations are executed or none. Consistency ensures that a transaction brings the database from one valid state to another. Isolation ensures that concurrent transactions do not interfere with each other. Durability guarantees that once a transaction is committed, its changes are permanent. Therefore, the correct answer is "Conditional" as it is not one of the ACID properties.

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7.

What is the EJB Mechanism that Can Build a Scheduled Application?

Callback
Dependency Injection
Interceptor
Timer Service

Correct Answer

A. Timer Service

Explanation

The Timer Service in EJB is the mechanism that can be used to build a scheduled application. The Timer Service allows developers to schedule tasks to be executed at specific times or intervals. It provides a simple and reliable way to automate recurring tasks in an enterprise application. With the Timer Service, developers can create timers that trigger method invocations on EJB components, allowing them to perform scheduled operations such as sending notifications, generating reports, or updating data.

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8.

Which of the Following Can be Used in EJB to Create Custom Queries Easily Without Worrying About Specific Details of the Database?

DAO
EJBQL
HQL
SQL

Correct Answer

A. EJBQL

Explanation

EJBQL can be used in EJB to create custom queries easily without worrying about specific details of the database. EJBQL is a query language specifically designed for EJB applications. It allows developers to write queries using object-oriented concepts and entity relationships, rather than directly dealing with the underlying database structure. This abstraction layer provided by EJBQL simplifies the process of creating queries and makes it easier to maintain and update the code in case of any changes in the database schema.

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9.

What EJB Transaction Attribute Signify that the Business Method Will Run as Part of Transaction?

MANDATORY
NEVER
REQUIRED
SUPPORTS

Correct Answer

A. SUPPORTS

Explanation

The EJB Transaction Attribute "SUPPORTS" signifies that the business method may run as part of a transaction, but it is not mandatory. It means that if a transaction is already in progress, the method will participate in that transaction. However, if no transaction exists, the method will still be executed outside of any transaction.

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10.

In EJB, What Do You Call Exceptions that are Not Caused by Business Code or Business Logic?

Application Exception
Non-Business Exception
System Exception
None of the Above

Correct Answer

A. System Exception

Explanation

In EJB, exceptions that are not caused by business code or business logic are called System Exceptions. These exceptions are typically caused by system failures, such as network errors or database failures, and are not directly related to the business logic of the application. Application Exceptions, on the other hand, are exceptions that are caused by business logic and are explicitly declared in the application code. Non-Business Exception is not a recognized term in EJB.

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How Well Do You Know Ejb (Enterprise Java Beans)?

What EJB Category Stores A Specific User’s Data For a Single Session?

Quiz Preview

What Type of EJB Is Often Used To Run Independent Operations?

Which of the Following is a Major Requirement When Running EJB?

What EJB Category Acts as a Permanent Data Storage?

Which of the Following is Used by Java Based Applications for Directory Services and Naming?

Which of the Following is Not One of the ACID Properties?

What is the EJB Mechanism that Can Build a Scheduled Application?

Which of the Following Can be Used in EJB to Create Custom Queries Easily Without Worrying About Specific Details of the Database?

What EJB Transaction Attribute Signify that the Business Method Will Run as Part of Transaction?

In EJB, What Do You Call Exceptions that are Not Caused by Business Code or Business Logic?