Cached Row Set

I have the following JSP for CachedRowSet :
It works okey for the first time but when I click on next it is giving me : The environment is WebSphere 3.5 on AS400
Note: A servlet gathers the regular resultset , populates the CachedRowSet with it and then puts the CachedRowset in to the session and sendRedirects the request to this jsp...
Any ideas greatly appriciated...
Thanks
Cuneyt
ERROR START
java.lang.NullPointerException
sun/jdbc/rowset/CachedRowSet.checkIndex(I)V+0 (CachedRowSet.java:1338)
ERROR END
JSP CODE START:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<%@ page import="java.util.*, sun.jdbc.rowset.CachedRowSet"%>
<HTML>
<HEAD>
<jsp:useBean id="crsItems" class="sun.jdbc.rowset.CachedRowSet" scope="session">
<%
     crsItems = (CachedRowSet) session.getAttribute("crsItemResults");
     session.removeAttribute("crsItemResults");
     crsItems.first();
%>
This is the first time start up...
</jsp:useBean>
<META name="GENERATOR" content="IBM WebSphere Page Designer V3.5.2 for Windows">
<META http-equiv="Content-Style-Type" content="text/css">
<TITLE></TITLE>
<LINK rel="stylesheet" href="file:///P:/CUSTOM~1/Genesys/STUDIO~1/GENESY~1/theme/Master.css" type="text/css">
<SCRIPT LANGUAGE="JavaScript" SRC="file:///P:/CUSTOM~1/Genesys/STUDIO~1/GENESY~1/GCMFunctions.js"></SCRIPT>
<SCRIPT language="JavaScript">
xLocation = document.location;
xLocation = xLocation.toString();
xRoot = xLocation.substring(0,xLocation.indexOf('/servlet'));
if (xRoot == "") xRoot = xLocation.substring(0,xLocation.lastIndexOf('/'));
function showGroup(){
     parent.document.frames[1].location = xRoot + "file:///P:/CUSTOM~1/Genesys/STUDIO~1/GENESY~1/" + "wait-iframe.html?cmd=Group";
</SCRIPT>
</HEAD>
<BODY BGCOLOR="#FFFFFF" onLoad="showGroup();">
This is the second time
<%
     if ( request.getParameter("next") != null ) {
          out.println("next me");
          if (crsItems.next()) out.println("yes next");
          else out.println("no next");
%>
<FORM METHOD="POST">
     <INPUT TYPE="text" NAME="field1" VALUE="<%=crsItems.getString(1)%>">
     <BR>
     <FONT size="2" face="Tahoma">
     <INPUT type="submit" name="previous" value="Previous Item" class="PButtonOut" onmouseover="this.className='PButtonIn'" onmouseout="this.className='PButtonOut'">
     </FONT><FONT size="2" face="Tahoma">
     <INPUT type="submit" name="next" value="Next Item" class="PButtonOut" onmouseover="this.className='PButtonIn'" onmouseout="this.className='PButtonOut'">
     </FONT>
</FORM>
</BODY>
</HTML>
END OF JSP CODE

I think the problem lies in how you use <jsp:useBean>.
On first entry to this page, I assume that the CachedRowSet has been populated and stored as a session attribute with key "crsItemResults".
For this first time through, the session context will not contain an attribute "crsItems" and so the <jsp:useBean name= "crsItems"....> will do the following:
1. Instantiate a CachedRowSet object with default constructor, define a local variable "crsItems" and assign it as the reference to the new CachedRowSet.
2. Add a session attribute with key "crsItems" and value = the new (and empty) CachedRowSet instance.
3. Perform the initialization code inside the <jsp:useBean> tag.
crsItems = (CachedRowSet) session.getAttribute("crsItemResults");
Retrieves the pre-populated CachedRowSet from the session context and assigns the reference to local variable crsItems.
session.removeAttribute("crsItemResults");
Remove the original session attribute.
At the end of this code, the local variable "crsItems" refers to the populated CachedRowSet but the session attribute "crsItems" refers to an empty CachedRowSet.
On the second time through, the "crsItems" session attribute is retrieved and local variable "crsItems" references the empty CachedRowSet. The original data is no longer available which results in your error.
It's a long-winded theory but I hope it helps. Fixing the problem should be easy - either save the original CachedRowSet with session attribute key "crsItems" and remove the init code or add a line in the init code to re-save the "crsItems" attribute.

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