Session is not Migrated when I use HttpSessionActivationListener .

Hi all,
I studied about HttpSessionActivation Listener and in order understand it fully I created a simple program . I studied that the listener will be invoked whenever session attribute is migrated from one JVM to another .
The following was what I did to understand HttpSessionActivationListener
Created two instances of Tomcat in a single box.(Actually two services)
Configured Apache Http Server to point the two instances (Load balancing and fail over) [Using this link|http://thought-bytes.blogspot.com/2007/03/how-to-load-balance-tomcat-55-with.html]
Created a small web application and deployed in two servers
Source codes
===========
SessionMigrationTester Listener
package c6;
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
public class SessionMigrationTester implements HttpSessionActivationListener,Serializable { //Implemented Serializable Interface
     public void sessionDidActivate(HttpSessionEvent evt){
          System.out.println("========================");
          System.out.println("Session DID Activated --**-- Serializable");
          System.out.println("========================");
     public void sessionWillPassivate(HttpSessionEvent evt){
          System.out.println("========================");
          System.out.println("Session WILL Passivate --**-- Serializable");
          System.out.println("========================");
}Web.xml
========
<web-app>
<servlet>
     <servlet-name>SessionTest</servlet-name>
     <servlet-class>c6.SessionExample</servlet-class>
</servlet>
<servlet>
     <servlet-name>servlet3</servlet-name>
     <servlet-class>c6.Servlet3</servlet-class>
</servlet>
<servlet-mapping>
     <servlet-name>SessionTest</servlet-name>
     <url-pattern>/sessiontest.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
     <servlet-name>servlet3</servlet-name>
     <url-pattern>/servlet3.do</url-pattern>
</servlet-mapping>
</web-app>SessionExample.java
package c6;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class SessionExample extends HttpServlet {
     public void doGet(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException {
          System.out.println("Inside doGet method ");
          PrintWriter out = resp.getWriter();
          resp.setContentType("text/html");
          HttpSession session = req.getSession(false);
          out.println("<html>");
          out.println("<head> ");
          out.println("</head>");
          out.println("<body>");
          out.println("<form >");
          if(session ==null){
               System.out.println("No Session exists creating a new one ....");
               session = req.getSession(true);
               String sessionID = session.getId();
               if(session.isNew()){
                    session.setAttribute("hello",new SessionMigrationTester());
                    out.println("New session is created ID:- "+sessionID);
                    System.out.println("New session is created ID:- "+sessionID);
          }else {
               String sessionID = session.getId();
               session.setAttribute("hello",new SessionMigrationTester());
               out.println("Old session ID:- "+sessionID);
               System.out.println("Old session ID:- "+sessionID);
          out.println("Modified ***<br/>");
          out.println("<input type='submit' value='click me' />");
          out.println("<script lang='javascript'>");
          out.println("document.forms[0].action ="+"\""+resp.encodeURL("servlet3.do")+"\"");
          out.println("</script>");
          out.println("</form>");
          out.println("</body>");
          out.println("</html>");
          System.out.println("End of doGet");
     public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException {
          doGet(req,resp);
}Servlet3.java
=========
package c6;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Servlet3 extends HttpServlet {
     public void doGet(HttpServletRequest req,HttpServletResponse resp)
     throws ServletException,IOException {
          HttpSession session = req.getSession(false);
          if(session!=null){
               System.out.println("Session Already Exists! "+session.getId());
          }else{
               System.out.println("Session doesn't exists!!!");
     public void doPost(HttpServletRequest req,HttpServletResponse resp)
     throws ServletException,IOException {
          doGet(req,resp);
}Whenever I stop one instance(say "Tomcat instance 1") I'm getting a message "Session Will Passivated "(which is what I have in overridden sessionWillPassivate method)
I'm also getting "Session Did Activated" message (overridden in sessionDidActivated method) whenever I start the same instance(say "Tomcat instance 1").
What I expected
============
After stopping the Tomcat instance (say "Tomcat instance 1") I reloaded the same page expecting this time it will be served by another Tomcat instance(say "Tomcat Instance 2" and I will get "SessionDidActivated" message from "Tomcat instance 2" but it didn't worked as I expected instead the page is served by another Tomcat instance("Tomcat instance 2") but the session is not migrated and I'm not getting "SessionDidActivated" in the new Tomcat instance.
I also created a new Servlet named as (Servlet3) and modified SessionExample.java to this .so that It contains button and when it clicked it will hit a new Servlet(Servlet 3) but it also doesn't help.
I'm trying this in a single physical machine with two tomcat instance configured with Apache Http Server .
Is anything I'm missing ?
Please clarify me why the session is not migrated .
Thanks in advance

Hi ejp,
One more question I have . Today I tried to find out why the listener class is not invoked(I doesn't get "SessionDidActivated" and "SessionWillPassivate" sysouts from listener class) and found that when I enable clustering in Tomcat it's doesn't works(even though session migrates) and when I switch back to normal mode it does work .
Following is the fragment I uncomment to enable clustering
Am just curious to know why it happens like this .
Can you please clarify me ?

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