Session Invalidation

[Krishna, Alle]

Hi All,
I wanted to know when a session is invalidated with a HttpSession.invalidate() call, is the session object destroyed or are all the objects associated with the session are destroyed?
Snippet of the code I have in a JSP,
String inv = request.getParameter("action");
if(inv != null && inv.equals("invalidate")) {
session = request.getSession(true);
session.invalidate();
}
System.out.println("SESS = " + session);
String sessionAttr1 = (String)session.getAttribute("uid");
I get an IllegalStateException when the getAttibute method in the above piece of code is executed. But, I can see the print statement SESS shows a session.
FYI: I am using Orion Application Server, ver 1.5.2
Can someone let me know the answer. I appreciate the response in advance. Let me know if the question is ambiguous.
Thanks.

[William Brogden]

I believe it works this way. When you call session.invalidate, the system detaches all items attached to the session object and marks it as an invalid session. Subsequently all session method calls then throw that exception. The servlet engine can't null out all references to the session until after the current request/response cycle is finished so the object is still there.
Bill

[Krishna, Alle]

Bill,
Thank you for the information. So is this some kind of limitation the Session Management API.
Once again, Thanks
Vasanth

[Maulin Vasavada]

hi Krishna
to be on safe side i'd have written,

if(inv != null && inv.equals("invalidate")) {
session = request.getSession(true);
session.invalidate();
} else {
System.out.println("SESS = " + session);
String sessionAttr1 = (String)session.getAttribute("uid");
}

regards
maulin