java.lang.NoClassDefFoundError

Hi everyone, I am learning EJB. The following is what I have done. I want to know If I am doing right. I appreciate your help. Thanks in advance
1. I created EJB project in Eclipse and glassfish bundle and package.
2. I created stateless bean. Eclispe created interface for me.
3. I created web project and added the EJB project in the project.
4. I called the methoid and got very nice excetion: java.lang.NoClassDefFoundError. Please help !

My Interface

My bean

My Servlet

package com.TestServlet;

import com.beans.PersonBean;
import com.beans.PersonBeanLocal;
import java.io.IOException;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;

public class TestServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
		// TODO Auto-generated method stub
	doPost(req,res);}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	response.setContentType("text/html");
	PrintWriter out = response.getWriter();
	out.println("<html><head></head>");
	out.println("<body>");
	PersonBean pb = new PersonBean();
	try {
		InitialContext ic = new InitialContext();
		PersonBeanLocal pbl = (PersonBeanLocal)ic.list("EJBTest/PersonBean/Local");
		String greeting = pbl.greet("Narayan Niroula");
		//out.println(greeting);
	} catch (NamingException e) {
		
		e.printStackTrace();
	}
	out.println("This is testing text");
	out.println("</body>");
	out.println("</html>");
	}

}

I have done this much. Are there any steps I need to do? Thanks a lot.

Hi Silu,
Please next time, use code tags to format your code in order to make it easier to read. I did it for you this time.

java.lang.NoClassDefFoundError isn't sufficient, check the log file and tell us the whole exception including the message.

Hi Hussein, thanks, I am using Glassfish and Eclispe bundle and dont have any idea of log file , where it is located. Please guide. Thanks in Advance.

By default the file is named server.log and it is located in domain-dir/logs.

Hussein Baghdadi wrote:By default the file is named server.log and it is located in domain-dir/logs.

HI Hussein, I looked for the server.log file and there is nothing in the domain dir. The log filder is empty. I am using Gassfish and Eclipse bundle .I have attached the screen shot. Thanks