Re: Session Problem

I think what you have ought to work, but there are a lot of subtle things
that can cause session state to be dropped.  Here are my
suggestions/questions:

1) use a standard fare SessionSnoop servlet or HitCount servlet that
exercises session tracking, to see if the function works
2) look in your stdout/stderr files for your application server/servlet
engine to see if that sheds any more light
3) do you use cookies or url rewriting as your vehicle to carry the session
id?
4) are you using any of the following:
     session persistence,
      basic authentication,
     multiple (or cloned) application servers
     identical virtual hosts for both servlets




"Gibbons, Michael" <bmis04@MARYWOOD1.MARYWOOD.EDU>@midrange.com on
11/22/2000 02:30:23 PM

Please respond to JAVA400-L@midrange.com

Sent by:  owner-java400-l@midrange.com


To:   "Java-L (E-mail)" <java400-L@midrange.com>
cc:
Fax to:
Subject:  Session Problem



Hello,

I have an HTTP servlet that creates a session and stores data in it. I know
this works because I have put it in debug and can see the values. I am
executing anther HTTP servlet in the same package and I always get a null
returned. Why cant I access this session again?

Thanks for any Help!

This is the code that loads the data
/**
 * This class holds the session key to the session object
 */
public class Constants {
     public  final static String SESSION_KEY = "session_key";
public Constants() {
     super();
}
}

// Create a session object if one does not already exist
          HttpSession session = req.getSession(true);
// Create a session info object to store variables
          sessInfo = new SessionInfo();
// Load object with variables
          sessInfo.setRCDNBR(RCDNBR);
          sessInfo.setWSLO(WSLO);
          sessInfo.setSEMTXT(SEMTXT);
          sessInfo.setSTTNAM(STTNAM);
          sessInfo.setSTADR(STADR);
          sessInfo.setSTCITY(STCITY);
          sessInfo.setSTSTAT(STSTAT);
          sessInfo.setSTZIP(STZIP);
          sessInfo.setSSN(req.getParameter("SSN"));
          sessInfo.setPIN(req.getParameter("PIN"));
          sessInfo.setEMAILADDR(req.getParameter("EMAILADDR"));

// Attach session info to session object
          session.putValue(Constants.SESSION_KEY,sessInfo);

THIS is the code in the second servlet that always returns null for session

SessionInfo sessInfo =null;
          // Get Session Object
               HttpSession session = req.getSession(false);
               if (session == null) {
                    // Redirect to Log in page if not already
logged in
                    res.sendRedirect("/olr/reglogout.html");
                    System.out.println(" session is null");
               } // End Get Session Object

               // Retrieve Session Information Object
               sessInfo = (SessionInfo)
session.getValue(Constants.SESSION_KEY);
               if (sessInfo == null) {
                    // Redirect to Log in page if not already
logged in
                    res.sendRedirect("/olr/reglogout.html");
                    System.out.println(" sessInfo is null");
               } // End SessionInfo Object


Michael P. Gibbons
Manager of Programming & Technical Services
MARYWOOD UNIVERSITY
2300 Adams Ave.
Scranton, PA 18509
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