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From Rainer Jung <>
Subject Re: Apache/mod_jk serves random files from tomcat
Date Mon, 14 Jul 2008 21:21:44 GMT
dave.smith schrieb:
>> Wow. That's weird. Is Tomcat serving the file, or is httpd serving it?
> Not too weird.  I am experiencing the same thing with Tomcat 5.5 and mod_jk
> 1.2.23.  I have Tomcat serving everything.
> I am also using a load balancer that sends an OPTION every 2 seconds to each
> web server to make sure that the server is alive.
> This intermittent random response issue is really killing me.

Could you please also add some info:

Tomcat version?

And from my previous mail:

What's you platform and which httpd MPM (prefork orworker or something 
else) do you use? For some platforms (e.g. AIX) the detection of 
multi-threading in httpd during mpod_jk build-time was broken. Starting 
with 1.2.24 we build always including multi-thread support unless 
explicitely stated via a configure option. If you 1.2.23 build is not 
thread safe, but your httpd uses threads (like with worker mpm), then 
such trouble is possible, although more likely you would see crashes 
etc. For most platforms like Linux and Solaris the threading detection 
was OK already before 1.2.24.

Another possible (but not very likely) cause could be bug 44494 of 
Tomcat 6.0.16/5.5.26 which under certain circumstances could leave data 
in the request object after request handling completed. You could try 
either downgrading to 6.0.15/5.5.25 or upgrading to the soon to be 
expected 6.0.17/5.5.27.

I would also add the access log on the Tomcat side. If you find the same 
phenomenon there, then it's unlikely, that httpd/mod_jk are responsible 
and the reason should be inside Tomcat or the webapp.

Can you reproduce the problem on a test system?



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