Mistery dissapearance of a session

navrsalemile · Jun 6, 2005

I have a class which sets session parameters using
session.putValue( "param1", "value1");
session.putValue("param2", "value2");

and then redirects to a JSP page:

response.sendRedirect( "

http://localhost:8889/app/somepage.jsp")

somepage.jsp retrieves session params using this scriptlet:

<%
String param1 = "";
Object o = pageContext.getAttribute("param1", PageContext.SESSION_SCOPE );
if ( o != null ) {
param1 = o.toString();
out.println("param1 = " + param1);
}
String param2 = "";
o = pageContext.getAttribute("param2", PageContext.SESSION_SCOPE );
if ( o != null ) {
param2 = o.toString();
out.println("param1 = " + param2);
}
%>
...
<%@ include file="header.jsp" %>
...
<%
if (param2.compareTo("") != 0 ) {
out.flush();
pageContext.include( "welcome_" + param2 + ".jsp );
}
else {
out.println( "page not included")
%>
...
<%
if (param1.compareTo("") != 0) {
out.flush();
pageContext.include( param1 + ".jsp" );
else {
%>
...
<%@ include file="footer.jsp" %>

But the attributes retrieved from session here are nulls as I get message "page not included".
Isn't sendRedirect() supposed to preserve the session and only create a new http request!?

thanks,
mile

venur · Jun 7, 2005

Hi,

HttpSession.putValue is been Deprecated. Try with setAttribute(String, Object) insted of putValue(String,Object);

Cheers
Venu

navrsalemile · Jun 8, 2005

Tried all sort of things including that but no success. putValue() is equivalent to setAttribute().
Just before sendRedirect() I check parameters in session and they are there. After redirecting to JSP I check session using pageContext session scope and HttpSession but params are null!? I have no clue what is wrong

venur · Jun 8, 2005

Hi,

Try this Test pages. Run resredirect.jsp which set's the attributes in session and redirect's to the redirect.jsp which will print the values in the session object.

resredirect.jsp

Code:

<%@ page contentType="text/html;charset=windows-1252"%>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
    <title>Session Put Values</title>
  </head>
  <body>
   <%
     // put dummy values into session and redirect to a differernt page
     session.setAttribute("user","hello");
     session.setAttribute("role","admin");
     response.sendRedirect("redirect.jsp");
   %>
  </body>
</html>

redirect.jsp

Code:

<%@ page contentType="text/html;charset=windows-1252"%>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
    <title>Redirect JSP page</title>
  </head>
  <body>
  <%
    //print values from session
    String user  = pageContext.getAttribute("user",PageContext.SESSION_SCOPE).toString();
    String role  = pageContext.getAttribute("role",PageContext.SESSION_SCOPE).toString();
    out.println("For User " + user + " >> Role is " + role);
  %>
  </body>
</html>

Output what I got is

Code:

For User hello >> Role is admin

Cheers
Venu

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Mistery dissapearance of a session

navrsalemile

Programmer

venur

MIS

navrsalemile

Programmer

venur

MIS

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