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From Anbu <>
Subject RE: One user seeing another user's data
Date Mon, 23 Feb 2004 15:07:45 GMT
Hello All,
I think that this problem (one user seeing another user's data) might be due to threadedness/concurrency
of Tomcat. Ofcourse there could be problem with the JSP application too.
Can anyone throw some light on the possible session mixups happening with Tomcat server? I
have seen the dev mailing list that such a thing happens when there are two or more tomcat
server instances.
Thanks and Regards,

Kal Govindu <> wrote:
We had this problem on our first JSP application. One of the things we
had to fix it was to remove all variable definitions from and
move them to .


-----Original Message-----
From: Antonio Fiol Bonnin []
Sent: Tuesday, February 17, 2004 2:17 AM
To: Tomcat Users List
Subject: Re: One user seeing another user's data

Hi Kuloth,

Seatch Tomcat-user for "concurrency problems" or "threading issues". 
There has been recent discussion on the topic.

Concurrency problems are the main source of session mix-up. Also look 
for "instance variables" (hint: avoid them in Servlets)

Antonio Fiol

Anbu wrote:

>Hello Bill and All,
>Could any one of you throw some light on a problem that I am facing on
Apache 1.3.28/Mod-jk 1.2.0/Tomcat 4.0.6 setup?
>The problem is that an user could see someother user's data (some kind
of session mix up). When I searched the tomcat-dev list I found that
Bill had replied that the problem could be related to error handling and
it is not a synchorinazation problem.
>Bill, as you have already seen and analyized this issue, could you
please help me on this issue ?
>Thank you all in advance.

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