DO NOT REPLY [Bug 35352] New: - Servlet runs 3x (with the same session) after one GET/POST

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http://issues.apache.org/bugzilla/show_bug.cgi?id=35352

           Summary: Servlet runs 3x (with the same session) after one
                    GET/POST
           Product: Tomcat 5
           Version: 5.5.9
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Unknown
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: karnok.d@freemail.hu


I've noticed that on a simple Servlet Page that contains forms and I click on a 
standard Submit button, sometimes my Servlet runs 2x-3x times. I'm running the 
Tomcat on my own PC under WinXP+SP2 but this happens under Linux (RedHat 3ES) 
too. I'm a single user. I know because at the begining of my servlet is a 
System.out.println("Starting: MyServlet"); and at the end is a 
System.out.prinlnt("Ending: MyServlet");
Form looks like:
<form action='MyServlet' method='POST'>
<input type='hidden' name='PROCESS' value='INSERT'>
<input type='hidden' name='ID' value=''>
<input type='text' name='NAME' value=''>
<input type='submit' value='Send'>
</form>

When everything is ok I get the following in the Tomcat Console:

Starting: MyServlet
Ending: MyServlet

But in some cases the following message appears:

Starting: MyServlet
Starting: MyServlet
Ending: MyServlet
Ending: MyServlet

And at the worst case:

Starting: MyServlet
Starting: MyServlet
Ending: MyServlet
Starting: MyServlet
Ending: MyServlet
Ending: MyServlet

I used the following Browsers: IE6+SP2, Mozilla1.7.8 (XP&Linux), Firefox1.0.4 
(XP&Linux), Opera8.0, Netscape7.2

It seems that all 3 instances recieve the same Session content, but they put 
and clear values from session (because they think that that session is just 
theirs). The MyServlet does database INSERT-s too so running multiple times 
causes a Primary Key Violation.

I checked my Browsers with a proxy snooper and they send only one request.

Something causes the Tomcat to run my servlets multiple times with the exact 
same session.

I use Eclipse 3.0 + MyEclipse 3.8.4 to generate Servlets and JSPs and for 
debugging.

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