Simple EJB3 Example

This post provides instructions on creating a simple Stateless Session Bean and a test client to see it working. It assumes Eclipase IDE and JBoss.

Create a new EJB project in Eclipse, called EJB3SessionBeanExample. Accept all project defaults.

Create 2 packages under the ejbModule directory: "bean" and "client"

Create the following classes under the bean folder:

IHelloBean

package bean;

import java.io.Serializable;

public interface IHelloBean extends Serializable {

  public void doSomething();

}

HelloBeanRemote

package bean;

import javax.ejb.Remote;

@Remote

public interface HelloBeanRemote extends IHelloBean {

}

HelloBeanLocal

package bean;

import javax.ejb.Local;

@Local

public interface HelloBeanLocal extends IHelloBean {

}

HelloBean

package bean;

import javax.ejb.Stateless;

/**

* Session Bean implementation class

*/

@Stateless

public class HelloBean implements HelloBeanRemote, HelloBeanLocal {

  private static final long serialVersionUID = 9184424076718418234L;

  public void doSomething() {

    System.out.println("Hello World!");

  }

}

Create the HelloBeanClient under the client folder:

package client;

import java.util.Properties;

import javax.naming.InitialContext;

import javax.naming.NamingException;

public class HelloBeanClient {

  public static void main(String[] args) {

    try {

      Properties props = new Properties();

      props.setProperty("java.naming.factory.initial",
          "org.jnp.interfaces.NamingContextFactory");

      props.setProperty("java.naming.factory.url.pkgs",           "org.jboss.naming");

      props.setProperty("java.naming.provider.url",
"127.0.0.1:1099");

      InitialContext ctx = new InitialContext(props);

      MyBeanRemote bean = (MyBeanRemote) ctx.lookup("MyBean/remote");

      bean.doSomething();

    } catch (NamingException e) {

      e.printStackTrace();

    }

  }

}

Right click on the EJB3SessionBeanExample project and select Run As -> Run on Server to publish to the server.

Once it is successfully deployed, right click on the HelloBeanClient class and select Run As -> Java Application. Accept any defaults and run it. You should see Hello World! printed to the console (or log C:\Apps\JBoss\jboss-5.1.0.GA\server\default\log depending on setup).