Ads

Tutorials

EJB 3.0 Tutorials: Learn EJB 3.0 with Simple Examples J2EE Tutorials: Effective ways to learn J2EE Enterprise JavaBeans (EJB): An Overview Enterprise JavaBeans (EJB) Tutorials Enterprise JavaBeans (EJB) Basics EJB 3.0 Tutorial Inheritance in Spring Spring Injection Example Calling Constructor in Spring Spring Hello World Application Bean life cycle in spring init Method in Spring Spring Batch Example Introduction to POJO (Plain Old Java Object) Programming Model Stateless Session Bean Example EJB 3.0 Tutorials EJB Container or EJB Server Stateful Session Bean Example J2EE Tutorial - Java Bean Session Beans Application Server Enterprise Beans Accessing Database using EJB Deleting a Row from SQL Table Using EJB EJB directory structure EJB Hello world example EJB container services EJB create method EJB deployment descriptor EJB Insert data EJB Interfaces EJB life cycle method EJB lookup example Ejb message driven bean EJB remote interface J2EE Tutorial - RMI Example A Message-Driven Bean Example J2EE Tutorial - Session Tracking Example J2EE Tutorial - Running RMI Example J2EE Tutorial - Session Tracking

EJB Hello world example

Creating and testing the "Hello World" Example is the very first step towards learning of any application or programming language. In the given example we are going to show you, how to create your first hello world example in EJB and testing it.

You can also create a hello world example to test your EJB environment setup. This simple application will required three different files to print the message.

SessionBeanRemote.java:- This is the Remote interface which extends javax.ejb.EJBObject package. These are similar to RMI Remote interface. The use of remote interface is particularly helpful in providing business-specific functionality of an EJB.Here @Remote is the annotation used to declare the interface as Remote.

String�getAddress(); String�getCompanyname(); String�getResult():-These are the methods which is to be defined in the bean.

2. SessionBeanBean.java:-This is the bean of type session in which we have defined the body of the method which were declared in the
interface named SessionBeanRemote.java.@Stateless is the annotation used to declare the bean as a session type.

3. Main.java:-This is the client application from which we can access the methods which are defined in the bean.@EJB is the annotation
used for configuring the EJB values for a field and method.

SessionBeanRemote.java


package ejb;



import javax.ejb.Remote;





@Remote

public interface SessionBeanRemote {



  String getResult();



  String getAddress();



  String getCompanyname();

}

SessionBeanBean.java


package ejb;



import javax.ejb.Stateless;





@Stateless

public class SessionBeanBean implements

    SessionBeanRemote,SessionBeanLocal {



  public String getResult() {

  return "Hello World";

  }

  public String getAddress() {

  return "Sec-3,D-16/116,Rohini";

  }

  public String getCompanyname() {

  return "Roseindia.net Pvt.Ltd.";

  }

}

Main.java


package enterpriseappee5;



import ejb.SessionBeanRemote;

import javax.ejb.EJB;



public class Main {



  @EJB

  private static SessionBeanRemote sessionBeanBean;



  public static void main(String[] args) {

  System.out.println("Displaying Message using EJB:");

  System.out.println("=================================");

  System.err.println("Name of the Company is : =" 

	+ sessionBeanBean.getCompanyname());

  System.err.println("Address of the Company is : =" 

	+ sessionBeanBean.getAddress());

  System.err.println("Message is : ="

    + sessionBeanBean.getResult());

  System.out.println("=================================");

  }

}

Output of the program

 Displaying Message using EJB:

=================================

Name of the Company is : =Roseindia.net Pvt.Ltd.

Address of the Company is : =Sec-3,D-16/116,Rohini

Message is : =Hello World

=================================

Download Source code

Spring Framework Training

R Programming Training

Share on Google+

EJB Hello world example

Posted on: January 12, 2009 If you enjoyed this post then why not add us on Google+? Add us to your Circles

Related Tutorials

EJB 3.0 Tutorials: Learn EJB 3.0 with Simple Examples

J2EE Tutorials: Effective ways to learn J2EE

Enterprise JavaBeans (EJB): An Overview

Enterprise JavaBeans (EJB) Tutorials

Enterprise JavaBeans (EJB) Basics

Discuss: EJB Hello world example View All Comments

Post your Comment

Comments:5

Subhash
July 29, 2011
EJB

How to run the above(EJB Hello world example) application? I am using Eclipse IDE with WebSphere server. I had created all the three above mentioned files.

Josh
October 20, 2011
xxx

SessionBeanLocal - does not exist.

gabriele
November 29, 2011
deploy

Hi, I have created the ejb, but how can I deploy it on JBOSS AS?

tester
March 19, 2012
error

What is SessionBeanLocal here ? Why you have used main function to demostrate EJB ? It is ridiculous to use main for this, someone can ask you "and what is the diference between SE java Bean and EJB?". You have not explained it.

Mustafa
January 8, 2013
Improper demo

Some error lies in the above code. 1)SessionBeanBean implements SessionBeanLocal which has not defined in whole programme. 2)In Main Class we should instantiate the object sessionBeanBean otherwise it gives us null pointer exception: it should be like that, in main function sessionBeanBean=new SessionBeanBean(); then we have to call the methods.

Ads