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From "Molina, Teresa" <>
Subject Tomcat serves incorrect page
Date Wed, 02 May 2007 23:18:40 GMT
We just had an extremely odd incident occur in our production
environment, and I am hoping the scenario sounds at least familiar to
someone. I'm having a fairly difficult time coming up with a good search
string, so please excuse me if this is a known issue.
This afternoon, we have a number of users in a variety of secure webapps
deployed on Tomcat 5.5 on one particular production server (Red Hat
Enterprise; we have three servers in this group behind load balancer).
At 2:25:04, one of them requests a page in webappA, say something like
/webappA/thisaction.act?param=1&param=2. About 45 seconds later, another
user requests a page in webappB, say
/webappB/another.act?field=4&field=3. In between the two requests, there
are probably 200 or 300 others, made by a variety of users, again, in a
variety of other webapps.
Here's the nutty part: The second user, instead of seeing the page they
requested in webappB, sees the page displayed to the first user, from
webappA. (The second user actually had the presence of mind to snap a
screenshot and send it to us.) 
Looking at the Apache access logs verifies what was supposed to have
happened and shows the requests fulfilled correctly. As far as I know,
none of the other users who requested pages between the two users saw
the wrong page. Nothing out of the order shows in the Tomcat logs,
either. The only thing a little unusual about the second user's request
is that it displays in a JS popup window (which is partly why the screen
shot illustrates the problem very clearly).
I'm thinking this has got to be some kind of cache issue, though I'm
confounded by the fact that it's across webapps/contexts. there's
nothing unusual about the JSessionIDs, so that's not it. If anyone has
ideas, I'd be very grateful.

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