Session tracking help please

Hi everyone !
I had an application working under Websphere 3.5.4 and JDK 1.2.2.
This application used many session variables.
I have stopped working on it, and now that I want to use again, I get this stupid usual :
Unhandled error! You might want to consider having an error page to report such errors more gracefully
com.sun.jsp.JspException: Compilation failed
at javax.servlet.ServletException.(ServletException.java:49)
at com.sun.jsp.JspException.(JspException.java:29)
I try with a very very simple file :
<%@ page contentType="text/html"%>
<%@ page session="true"%>
<%
String name = request.getParameter( "nom" );
session.setAttribute( "theName", name );
%>
<HTML>
<HEAD>
<TITLE>Petit message</TITLE>
</HEAD>
<BODY>
Lien
</BODY>
</HTML>
The compilation always fails on the line with access to the session.
I have tried other access to the session object, but it semms that I cannot reach it any longer !
Can anyone help me, please ?
I really don't catch what the problem is !
vsa

I believe that you have to call request.getSession(true) to get the session variable. The request and response objects are available to the page without doing anything, but not the session object.
BTW, use request.getSession(true) to always get a session (create if there isn't one), or user request.getSession() if you don't want to create one if it isn't new, but you'll need to check for a null session.
Paul
Paul

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here is my code
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[//FirstNameSessionServlet.java
package myname;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class FirstNameSessionServlet extends HttpServlet{
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
         doPost(req, res);
    public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
         res.setContentType("text/html");
         PrintWriter pw=res.getWriter();
         pw.println("<html><body>");
         pw.println("<form action='/contentnames/uti/LastNameSessionServletpath' method='post'>");
         pw.println("<p>First Name: <input type='text' name = 'firstname'></p>");
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LastNameSessionServlet.java
LastNameSessionServlet.java
//LastNameSessionServlet.java
package myname;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class LastNameSessionServlet extends HttpServlet {
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
         doPost(req, res);
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         res.setContentType("text/html");
         PrintWriter pw=res.getWriter();
         pw.println("<html><body>");
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         int attrib=1;
         HttpSession sess = req.getSession();
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            req.setAttribute("firstnamesession",firstnamesession);
            //req.setAttribute("firstname",firstname);
         pw.println("<p>Your First Name is : "+firstname+"(getParameter method used)</p>");
         pw.println("<p>Your First Name is : "+firstnamesession+"(getSession method used)</p><br><br><br>");
          pw.println("session id: "+sess.getId());
          pw.println("session getLastAccessedTime"+sess.getLastAccessedTime());
          Enumeration names = sess.getAttributeNames();
          while (names.hasMoreElements()) {
               String name = (String) names.nextElement();
               Object value = sess.getAttribute(name);
               pw.println("<p>name=" + name + " value=" + value+"</p><br>");
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         pw.println("<p><input type='submit' value='Enter'></p>");
//         HttpSession sesslast = req.getSession();
//         sesslast.setAttribute("lastname","lastname");
         pw.println("</form></body></html>");
         pw.close();
FirstandLastNameSessionServlet.java
//FirstandLastNameSessionServlet.java
package myname;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class FirstandLastNameSessionServlet extends HttpServlet {
    public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
         doPost(req, res);
    public void doPost(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException
         res.setContentType("text/html");
         PrintWriter pw=res.getWriter();
         pw.println("<html><body>");
         HttpSession sess = req.getSession(true);
         String firstname = (String)sess.getAttribute("firstname");
         //String lastname = (String) sess.getAttribute("lastname");
         String lastname = req.getParameter("lastname");
         pw.println("<p>your first name is: "+firstname+"<br>");
         pw.println("your last name is: "+lastname+"</p><br><br><br>");
         Enumeration names = sess.getAttributeNames();
          while (names.hasMoreElements()) {
               String name = (String) names.nextElement();
               Object value = sess.getAttribute(name);
               pw.println("<p>name=" + name + " value=" + value);
          pw.println("session id: "+     sess.getId());
         pw.println("<h1>session tracked success</h1>");
         pw.println("</body></html>");
         pw.close();
}

Your understanding of the flow seems to be a little flawed.
When you first open the FirstNameSessionServlet, you get the textbox asking for the firstname:
>
FirstNameSessionServlet.java
[public void doPost(HttpServletRequest req,
HttpServletResponse res) throws IOException,
ServletException
     res.setContentType("text/html");
     PrintWriter pw=res.getWriter();
     pw.println("<html><body>");
pw.println("<form
m
action='/contentnames/uti/LastNameSessionServletpath'
method='post'>");
pw.println("<p>First Name: <input type='text'
' name = 'firstname'></p>");
pw.println("<p><input type='submit'
' value='Enter'></p>");//The running of the code till this point generates the HTML page, but your servlet is not done yet! Think of it as a function that till now, has printed some output ( the output being HTML code and the destination being the broswer ); but the function has not finished executing yet:
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     sess.setAttribute("firstname",firstname);
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     pw.println("</form></body></html>");
     pw.close();
LastNameSessionServlet.java
String firstname=
= req.getParameter("firstname");// This time, req.getParameter() will work since you submitted the last form which had a textbox with this name, you'll get the contents of that box.
     int attrib=1;
     HttpSession sess = req.getSession();
String firstnamesession = (String)
) sess.getAttribute("firstname");//In the last servlet, you put in this parameter, but the value was null for reasons explained above.
     HttpSession sesslast = req.getSession();
     sesslast.setAttribute("lastname","lastname");
     //Again, you will get null for lastname if you tried to access it from the request object since you only just created the field with that name and you would be trying to access it within the same servlet.
     pw.println("</form></body></html>");
     pw.close();
FirstandLastNameSessionServlet.java
     HttpSession sess = req.getSession(true);
String firstname =
= (String)sess.getAttribute("firstname");//this will still not work since you never put a correct value in the session object ( should have done after req.getParameter("firstname") in the second servlet )

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