Tommy
I don't know if this will be of any value to you but I had a similar case 
including session swapping. Users will see other users screens and data. Fairly 
nasty situation.
We solved this problem by:
Using prefork in apache 2
upgrading to a newer module.

The problem was also occuring during pick activity.
Our code wasn't changed.
We assumed that the issue was the combination of apache mpm config and the old 
module.

We also had DOS attacks from different time zones which contributed to some 
weird behaviour and made it harder to establish the root of the problem.

To help we recreated the same environment as we had in production.
This also helped us solved issues introduced with firewalls and load balancing.
We then used webload, jmeter and proxysniffer to record activity and 
stress/load test our apps.

Hopes this helps.
Bruno Georges

Glencore International AG
Tel. +41 41 709 3204
Fax +41 41 709 3000


----- Original Message -----
From: "Tommy Skarateppen" [EMAIL PROTECTED]
Sent: 12.05.2006 10:05
To: <users@tomcat.apache.org>
Subject: Problems with Tomcat and sessions

Hi!
We have a problem with a webapplication we have developed for one of our
coustomers. The problem is that Tomcat is creating new sessions when it
shouldn't.

The sessions does not die, but a new is created and thus loosing access
to the data in the original session. The result of the session
"switching" is that the user is kicked out of the webapp, and can't log
in until the "lost" session dies after 30 minutes (timeout). This does
happen 10 - 20 times during the day, and it happens about the same time
every day. At 10 - 11 in the morning and around 14 in the afternoon.
This is when the traffic on the server is at its most.

Our customer has the webapp in a Tomcat webhotel at an ISP, witch uses
some Apache front end servers to proxy requests to the Tomcat server.

We have checked our code thoroughly, and can't find anything there.
Since this problem occure irregularly, and have never occured on our
local test server, we suspect this is a server related problem. But we
are not 100% sure, therefore this post to this list. I've searched the
web to see if anyone else have had a similar problem, but haven't found
anything we can relate to our problem.

We know that there are 3 or 4 other webapps on the Tomcat hotel. The
server has 1GB of physical RAM. Other tecnical info:

Red Hat Linux release 7.3 (Valhalla)
Tomcat 5.0.28
Java 1.4.2_10
maximum Java heap size: 512m

We suspect the problem is either related to the use of front end servers
or lack of memory.

Does anyone of you have any suggestions on what can cause this trouble
or point us in the right direction?

-tommy





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