Question 1

Which EJB container must provide an implementation of Java Naming and Directory Interface (JNDI) API to provide naming services for EJB clients and components?

Accepted Answer

EJB containers must provide an implementation of the JNDI API for naming services, allowing EJB clients and components to look up EJBs and other resources.

Question 2

EJB is a specification for J2EE server, not a product; Java beans may be a graphical component in IDE.

Accepted Answer

EJB (Enterprise JavaBeans) is indeed a specification provided by Sun Microsystems (now part of Oracle Corporation) for developing component-based business applications. It is not a product itself but a set of APIs that can be implemented by various J2EE servers. JavaBeans, on the other hand, can be used as graphical components in an Integrated Development Environment (IDE) among other uses, making the statement true.

Question 3

A session bean represents a multiple clients inside the Application Server.

Accepted Answer

A session bean represents a single client inside the Application Server, not multiple clients. Each session bean instance is associated with a specific client.

Question 4

Which component does the Entity bean represent the persistent data stored in the database?

Accepted Answer

Entity beans are server-side components that represent persistent data stored in a database. They encapsulate the business logic for accessing and updating data, allowing clients to interact with the data without dealing with database-specific code.

Question 5

EJB is like COM, Abbreviate the term COM?

Accepted Answer

Component Object Model (COM) is a Microsoft platform for software componentry introduced in 1993, used to enable interprocess communication and dynamic object creation in a large range of programming languages.

Question 6

JMS is also known as a messaging service.

Accepted Answer

JMS stands for Java Message Service, which is indeed a messaging service designed for sending messages between two or more clients.

Question 7

What represents a persistent global data from the database?

Accepted Answer

Entity Beans are designed to represent persistent data stored in a database. They are used in Java EE (Enterprise Edition) to encapsulate the database access and the business logic around this data. Session Beans, on the other hand, are used to manage business processes and are not directly tied to the database persistence.

Question 8

Which component does the Entity bean represents the persistent data stored in the database?

Accepted Answer

Entity beans are server-side components that represent persistent data stored in a database. They encapsulate the business logic for accessing and updating data, allowing clients to interact with the data without dealing with database-specific code.

Question 9

In EJB, middleware services are provided by EJB Container automatically.

Accepted Answer

EJB Container automatically provides middleware services such as transaction management, security, remote access, and lifecycle management, which simplifies enterprise application development.

Question 10

Which middleware services are provided by EJB?

Accepted Answer

EJB (Enterprise JavaBeans) provides both security and transaction management as part of its middleware services, allowing for secure, reliable, and managed execution of business logic.

Question 11

Which server-side component is required to be deployed on the server?

Accepted Answer

The answer of Which server-side component is required to be...

Question 12

Which type of instances retain no data or conversational state for a specific client?

Accepted Answer

Message-Driven Beans (MDBs) are designed to process incoming messages asynchronously and do not maintain any conversational state with a specific client. They act upon the data in the message but do not hold state across method calls or transactions.

Question 13

EJB technology is built on the top of Socket Programming

Accepted Answer

EJB (Enterprise JavaBeans) technology is built on top of the Java RMI (Remote Method Invocation) technology, not directly on socket programming. RMI abstracts the complexity of direct socket programming.

Question 14

How constructor can be used for a servlet?

Accepted Answer

In a servlet, the constructor can be used for both initialization and as a constructor function. However, it's more common to use the servlet's init() method for initialization purposes, as it provides more control and is called by the servlet container to indicate that the servlet is being placed into service. Constructors in servlets are typically empty or used for very basic object setup, with most initialization work done in the init() method.

Question 15

Can servlet class declare constructor with ServletConfig object as an argument?

Accepted Answer

A servlet class cannot declare a constructor with a ServletConfig object as an argument because the servlet container is responsible for managing the servlet lifecycle, including the creation of its instances. Constructors in servlets are typically no-argument constructors, and the ServletConfig object is passed to the servlet through the init method instead.

Question 16

Java Servletsare efficient and powerful solution for creating ............for the web.

Accepted Answer

Java Servlets are specifically designed for creating dynamic content on the web, allowing for server-side processing that generates content in response to client requests. Static content, on the other hand, does not change and is not typically generated by servlets. Servlets have nothing to do with hardware.

Question 17

.......... is the first phase of the servlet life cycle.

Accepted Answer

The first phase of the servlet life cycle is Initialization, where the servlet is created and initialized with parameters from the web.xml file or annotations.

Question 18

The service phase of the servlet life cycle represents all interactions with requests until the servlet is ...........

Accepted Answer

The service phase of the servlet life cycle represents all interactions with requests from the time the servlet is initialized until it is destroyed. This phase encompasses the handling of all requests to the servlet until the servlet is taken out of service and destroyed.

Question 19

GET methods are great for sending ..........amounts of information that you do not mind having visible in a URL.

Accepted Answer

GET methods are designed for sending small amounts of information because the data is appended to the URL, which has a length limit and is visible to users and in server logs, making it unsuitable for large or sensitive information.

Question 20

Several vendors are adding ........... to their existing database .........

Accepted Answer

JDBC (Java Database Connectivity) drivers are used to connect Java applications to a database, and they are often added to middleware products to enhance database connectivity and integration capabilities.

Quiz 2: EJB, Servlets, and JNDI