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EJB Hello world example

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EJB Hello world example

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.

  1. 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

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Posted on: April 18, 2011

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