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Posted to users@tomcat.apache.org by nikhil Jain <ni...@wiproge.gsoi.med.ge.com> on 2001/11/09 12:47:59 UTC
tomcat finds lost session

i am new to servlets and jsp .
this seeems to be a tomcat problem:

i am forwarding a request from servlet to jsp using requestDispatcher ,
in that jsp , i am createing two child frames and calling two jsp into
targets of those frames

  example :

<%@ page language = "java" import = "java.io.*,java.util.* " session="false"
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>

           <%
			javax.servlet.http.HttpSession aSession=request.getSession(false);
			System.out.println("session :" +aSession);
			aSession.setAttribute("hello","hello world");


	   %>

<FRAMESET border=0 frameBorder=1 frameSpacing=0 cols="*,150" TOPMARGIN="0"
LEFTMARGIN="0" >
  <frame name = "frame8"  src =first.jsp scrolling=no >
  <frame src=second.jsp  scrolling=no name = "frame9">


</frameset>
</HTML>


for this jsp prints like :
session :org.apache.tomcat.session.StandardSession@36667228


now when i print session in first.jsp , tomcat server first shows me session
is null
throws null pointer exception on using it.
but again somehow it finds the session and shows me old session id.and works
fine


first.jsp

<%@ page language = "java" import = "java.io.*,java.util.* " session="false"
%>
		<%
	          	 javax.servlet.http.HttpSession
aSession=request.getSession(false);
			 System.out.println("session in first.jsp = " +aSession);
			 System.out.println(" string= "+(String)aSession.getAttribute("hello"));
		%>

		<html>
	<head>
	  <title>my jsp</title></head>

	<body  bgcolor="#FEFEF0"></body></html>



print like this on server:

session in first.jsp =null

throws null pointer exception

session in first.jsp =org.apache.tomcat.session.StandardSession@36667228

string=hello world






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