How to Lookup a session bean from a Javaclass/Servlet/jsp wi

[anusree]

Hi,
I have written stateless session bean in EJB 3.0 Project(JBoss 4.0.5) using JBossIDE for Eclipse,Version: 2.0.0,Build id: 2.0.0.Beta2
And then packaged into calculator.jar

Then i have created a Application client and calculator.jar is added to it's library.

This is the code for SesionBean

package trail.bean;

import javax.ejb.Remote;
import javax.ejb.Stateless;
import trail.bean.Calculator;
import org.jboss.annotation.ejb.RemoteBinding;

@Remote ({Calculator.class})
@RemoteBinding (jndiBinding="EJB3Trail/Calculator")
public @Stateless class CalculatorBean implements Calculator {
 public double calculate(int start, int end, double growthrate, double saving) {
 System.out.println("Inside calculate");
 double tmp = Math.pow(1. + growthrate / 12., 12. * (end - start) + 1);
 double val=saving * 12. * (tmp - 1) / growthrate;
 System.out.println("return Value:"+val);
 return saving * 12. * (tmp - 1) / growthrate;
 }
}

This is the code for Main.Java in App Client

import java.text.NumberFormat;
import javax.naming.InitialContext;
import trail.bean.*;


public class Main {
 public static void main(String[] args) {

 Calculator cal = null;

 try {
 InitialContext ctx = new InitialContext();
 cal = (Calculator) ctx.lookup("EJB3Trail/Calculator");
 //cal=(Calculator)ctx.lookup(Calculator.class.getName());

 } catch (Exception e) {
 System.out.println("-----------------Exception inside Lookup:"+e);
 e.printStackTrace();
 }
}

My problem is while running the Main.java it showing Error messge like this

Exception inside Lookup:javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:284)
at javax.naming.InitialContext.lookup(InitialContext.java:351)
at Main.main(Main.java:18)

Can anybody Help Me.How to Lookup a session bean from a Javaclass/Servlet/jsp with JBoss Server.I'm very new to JBoss and Eclipse
this code work well with SUN AppServer
Thanks for any help.