Session

This is a simple program I wrote to test whether the session is new or old.
What I cant get is , after I call session.invalidate() , how are the lines after session.invalidate being run.
like printing out the values of attribute.
Also , the session object is the same .

package com.example;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class MySessionServlet extends HttpServlet

{

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws IOException, ServletException
{

response.setContentType("text/html");

PrintWriter out=response.getWriter();

out.println("I am in a session.... :)");
out.println(" ");

HttpSession session=request.getSession();
out.println(" ");

out.println("This is session object: " + session);
out.println(" ");

if(session.isNew())

{out.println("NEW SESSION");}
else
{out.println("OLD SESSION");}

out.println(" ");

session.setAttribute("foo","429");
session.setAttribute("bar","420");

String foo= (String) session.getAttribute("foo");
String bar= (String) session.getAttribute("bar");

out.println(foo);
out.println(bar);

session.invalidate();

out.println("This is session object: " + session);
//out.println(" ");out.println(session.isNew()); //will cause error
out.println(" ");

out.println(foo);
out.println(bar);

}

You've already taken out the attributes out from the session before invalidating it. Try calling session.getAttribute after invalidating it, you'll get an IllegalStateException...

Invoking getAttribute() after invalidate() will definitely cause a runtime exception ,
But doesn't the attrbute value get destroyed when the session is invalidated??

But doesn't the attrbute value get destroyed when the session is invalidated??

you are storing them in the String Objects , nothing happens to the String objects.

Only the attributes which belonged to the session is no longer available.

That explains it. Thanks Priya !!!