On Aug 20, 2008, at 9:54 AM, Simon McLean wrote:
Hi All -
Wondering if someone can throw me some ideas on solving what looks
like an immortal session problem.
- Start up 1 instance in java monitor.
- User lands on sessionless login page. No sessions.
- User logs in. 1 session.
- User logs out. 0 sessions.
- User logs in. 1 session.
- User does nothing. Session times out. 0 sessions.
All looks good. However, we get to the end of the day and the
instance has 376 active sessions. But I know for this particular app
there are only 6 users, because they are all sitting next door :-)
Also, If i now leave this instance overnight none of those active
sessions will go away.
So what could be going on ? Something appears to be creating
immortal sessions, but forced session termination (by the user
logging out) and session expiration seem to be behaving themselves.
If the users don't notice any problems, my money would be on an
exception thrown from your Session.terminate(). Also check the
sleep() method to ensure it can never throw.
I have seen a related problem where two requests come in for the same
session (user double clicks, Ajax etc), and the first calls
terminate() on the session. The second thread is stuck and the app
can't gracefully shut down. IIRC, you would see zero sessions in this
case. The "fix" for this is to not call terminate() and instead set
the session timeout to a small number of seconds.
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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