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A Simple Java Client Server Application using EJB3 and Glassfish3

Well, in this tutorial i want to show you how to create a simple client server application using java. Actually java has dozens of different network protocols, from a simple socket, hessian, burlap, SpringHttpInvoker, SOAP, XML and so on. But in this example, i will try to create a very simple client server application with EJB 3, using Glassfish 3 as JavaEE Container. As usual, i use Netbeans 6.9 with its default Glassfish3 installation.

First, i create a new JavaEE, EJB Module project, named CompressedEJBServer, and create a simple Stateless Session Bean in it

package com.edw.facade;

import javax.ejb.Remote;

/**
 *
 * @author edw
 */
@Remote
public interface ConnectionFacadeRemote {
    String sayHello(String string);
    int sayAge(int age);  
}

and its implementation

package com.edw.facade;

import javax.ejb.Stateless;

/**
 *
 * @author edw
 */
@Stateless
public class ConnectionFacade implements ConnectionFacadeRemote {

    public String sayHello(String string) {
        System.out.println("im at " + this.getClass().getName() + " method sayHello()");
        return "hello " + string;
    }

    public int sayAge(int age) {
        System.out.println("im at " + this.getClass().getName() + " method sayAge()");
        return age * 2;
    }
}

and that’s my EJB3 Server side files. Simple isn’t it?

Next step is creating a Standard Java Application project, for my EJB3 client application. It consist only 1 java file, for testing connection to the server.

package com.edw.main;

import com.edw.facade.ConnectionFacadeRemote;
import java.util.Properties;

import javax.naming.Context;
import javax.naming.InitialContext;
import org.apache.log4j.Logger;

/**
 *
 * @author edw
 */
public class Main {

    private Logger logger = Logger.getLogger(Main.class);

    private void connect() {
        try {
            Properties props = new Properties();
            props.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.enterprise.naming.SerialInitContextFactory");
            props.setProperty("org.omg.CORBA.ORBInitialHost", "localhost");
            
            // glassfish default port value will be 3700, 
            // but im using tcpviewer to redirect my 50005 port to 3700
            props.setProperty("org.omg.CORBA.ORBInitialPort", "50005");

            InitialContext ctx = new InitialContext(props);
            ConnectionFacadeRemote connectionFacadeRemote = (ConnectionFacadeRemote) ctx.lookup("com.edw.facade.ConnectionFacadeRemote");
            logger.debug(connectionFacadeRemote.sayHello("edwin "));
            logger.debug("my age is " + connectionFacadeRemote.sayAge(12) + " years");
        } catch (Exception ex) {
            logger.error(ex.getMessage(), ex);
        }
    }

    public static void main(String[] args) {
        Main x = new Main();
        x.connect();
    }
}

include these jars to your client side’s application,

auto-depends.jar
common-util.jar
config.jar
config-api.jar
config-types.jar
connectors-internal-api.jar
container-common.jar
deployment-common.jar
dol.jar
ejb.security.jar
ejb-container.jar
glassfish-api.jar
glassfish-corba-asm.jar
glassfish-corba-codegen.jar
glassfish-corba-csiv2-idl.jar
glassfish-corba-newtimer.jar
glassfish-corba-omgapi.jar
glassfish-corba-orb.jar
glassfish-corba-orbgeneric.jar
glassfish-naming.jar
gmbal.jar
hk2-core.jar
internal-api.jar
javax.ejb.jar
javax.jms.jar
javax.resource.jar
javax.servlet.jar
javax.transaction.jar
jta.jar
kernel.jar
management-api.jar
orb-connector.jar
orb-iiop.jar
security.jar
tiger-types-osgi.jar
transaction-internal-api.jar 

and dont forget to add CompressedEJBServer project into CompressEJBClient’s project

this is what happen if i run my client side’s application

[Main] DEBUG com.edw.main.Main:30 - hello edwin 
[Main] DEBUG com.edw.main.Main:31 - my age is 24 years

this is my Server side’s project structures

and this is my Client side’s project structures
My Client Side's Project Structure

and this is my TCP Viewer logs, i try to redirect my localhost’s port 50005 into my localhost’s port 3700 (Glassfish’s port), so i can see what is passing through my 50005 port via TCP Viewer’s console.

Hope this can help, have fun and good luck. May the Source be with You.
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