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Posted to users@tomcat.apache.org by Nicolas Clemeur <nc...@daesim.com> on 2007/11/02 14:06:57 UTC
mod_jk problem for post request ended with a ? (question mark)
Hello all,
I have apache 2.2 in front of tomcat 6.0.13 and I use mod_jk (1.2.25)
as the connector.
It seems that whenever a form containing a question mark at the end of
the form action parameter is posted, mod_jk is dying silently (but recover)
(The resulting url is something like that /mysite/action.do? ).
No response at all is sent to the client.
Is this something known or is only me experiencing that problem. I know
that the url should not really containts the ending "?", but I can't
control that.
Cheers
Nicolas
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[SOLVED] Re: mod_jk problem for post request ended with a ? (question mark)
Posted by Nicolas Clemeur <nc...@daesim.com>.
Thanks again Rainer for guiding me toward the core/gdb/stacktrace approach.
After managing to get a meaningfull stacktrace (using gdb httpd core_file)
it was easy to see that the problem was NOT in mod_jk but in another
module (mod_auth_cas). I'll report this problem to them.
Best regards,
Nicolas
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Re: mod_jk problem for post request ended with a ? (question mark)
Posted by Nicolas Clemeur <nc...@daesim.com>.
>
> Your test JSP works fine for me with Apache httpd 2.2.6 and mod_jk
> 1.2.25 on Solaris. Since your jk log file ends very early in the request
> processing, the tomcat version should not matter (I used 5.5).
>
> I would guess, that something with your build is broken. It would also
> help, if we could see your mod_jk config (you posted parts of it, but it
> looks like things are missing).
The apache mod_jk configuration is this one. Would you need the
workers.properties?
LoadModule jk_module modules/mod_jk.so
<IfModule mod_jk.c>
JkWorkersFile /etc/httpd/conf.d/workers.properties
JkLogFile /var/log/httpd/mod_jk.log
JkLogLevel debug
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
JkOptions +ForwardKeySize
JkMount /app/* ajp13
JkMount /app ajp13
</IfModule>
These are the exact steps I have taken to build mod_jk:
./configure --enable-debug --with-apxs=/usr/sbin/apxs
make clean
make
and then as root
make install
> Does the segmentation fault produce a core dump?
> If no, start Apache httpd as a non-root user (and use ports above 1024)
> and maybe set CoreDumpDirectory. Then it should produce a core, whenever
> a segmentation fault appears in the log file.
>
> A core can then be inspected with gdb. Using gdb you can issue the
> command "bt" for backtrace. This will show us, in which mod_jk function
> the crash occured.
I managed to produce a core, but it does not look like there are
any debugging info available. When I run the bt command
(using gdb -c /path/to_core), have the following:
Using host libthread_db library "/lib/libthread_db.so.1".
Core was generated by `/usr/sbin/httpd'.
Program terminated with signal 11, Segmentation fault.
#0 0x0068dbf2 in ?? ()
(gdb) bt
#0 0x0068dbf2 in ?? ()
#1 0x08506478 in ?? ()
#2 0x0068fb6a in ?? ()
#3 0xbfc5b04c in ?? ()
#4 0x00000000 in ?? ()
Would that mean the problem is not in mod_jk, or would that mean
I did not compile mod_jk in debug mode?
Thanks again for your help.
Best regards,
Nicolas
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Re: mod_jk problem for post request ended with a ? (question mark)
Posted by Rainer Jung <ra...@kippdata.de>.
Your test JSP works fine for me with Apache httpd 2.2.6 and mod_jk
1.2.25 on Solaris. Since your jk log file ends very early in the request
processing, the tomcat version should not matter (I used 5.5).
I would guess, that something with your build is broken. It would also
help, if we could see your mod_jk config (you posted parts of it, but it
looks like things are missing).
Does the segmentation fault produce a core dump?
If no, start Apache httpd as a non-root user (and use ports above 1024)
and maybe set CoreDumpDirectory. Then it should produce a core, whenever
a segmentation fault appears in the log file.
A core can then be inspected with gdb. Using gdb you can issue the
command "bt" for backtrace. This will show us, in which mod_jk function
the crash occured.
Regards,
Rainer
Nicolas Clemeur schrieb:
> I forgot to mention that the request is sent over https.
> The https is handled by apache httpd. I am not sure If this has an impact
> as it would be difficult for me to test it under http.
>
> Cheers
>
> Nicolas
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Re: mod_jk problem for post request ended with a ? (question mark)
Posted by Nicolas Clemeur <nc...@daesim.com>.
I forgot to mention that the request is sent over https.
The https is handled by apache httpd. I am not sure If this has an impact
as it would be difficult for me to test it under http.
Cheers
Nicolas
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Re: mod_jk problem for post request ended with a ? (question mark)
Posted by Nicolas Clemeur <nc...@daesim.com>.
Thank you Rainer for taking the time to answer. My comments are below.
>
> Not a known problem. You can increase log level via "JkLogLevel debug".
> There should be a line containing "service" or "Service", which includes
> the URI) we send forward to Tomcat.
>
> The log will also show you, if any of your JkMount directives match,
> i.e. if mod_jk thinks it should forward, or it shouldn't.
I have set the log level to debug and when I submit that form the
only think I can see in the mod_jk log are the following lines:
Mod jk
[Sat Nov 03 11:00:34 2007] [1936:3085977296] [debug]
map_uri_to_worker::jk_uri_worker_map.c (609):
Attempting to map context URI '/app/*=ajp13' source 'JkMount'
[Sat Nov 03 11:00:34 2007] [1936:3085977296] [debug]
map_uri_to_worker::jk_uri_worker_map.c (624):
Found a wildchar match '/app/*=ajp13'
And then nothing else. Interestingly, at the same time of the request,
in the error log of apache, I always have the following:
[Sat Nov 03 11:00:34 2007] [notice]
child pid 1936 exit signal Segmentation fault (11)
On successful requests, I indeed observe the "Service finished "
with the status.
> You can report your findings back here, but please include configuration
> used, and some more details, like how exactly does the problematic URL
> look like.
Sorry, I did not give enough details. So I just create a simple jsp
to reproduce the problem. If I submit the jsp below
(which name should be test.jsp), I never receive a response back
from the server.
(Actually I could observe that the problem is not necessarily linked
to the post method. You can reproduce it with a get method if there
are no input in the form.)
I am running httpd 2.2.3 on CentOS 5. I have compiled my-self mod_jk
as the instruction in the BUILD.txt. Mod_jk is talking to tomcat 6.0.13.
--BEGIN JSP
<%@ page language="java" %>
<html>
<head><title>Test</title></title>
<body>
<br />
<form action="test.jsp?" method="post">
<input type="submit" />
</form>
</body>
--END JSP
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Re: mod_jk problem for post request ended with a ? (question mark)
Posted by Rainer Jung <ra...@kippdata.de>.
Not a known problem. You can increase log level via "JkLogLevel debug".
There should be a line containing "service" or "Service", which includes
the URI) we send forward to Tomcat.
The log will also show you, if any of your JkMount directives match,
i.e. if mod_jk thinks it should forward, or it shouldn't.
You can report your findings back here, but please include configuration
used, and some more details, like how exactly does the problematic URL
look like.
Regards,
Rainer
Nicolas Clemeur wrote:
> Hello all,
>
> I have apache 2.2 in front of tomcat 6.0.13 and I use mod_jk (1.2.25)
> as the connector.
>
> It seems that whenever a form containing a question mark at the end of
> the form action parameter is posted, mod_jk is dying silently (but recover)
> (The resulting url is something like that /mysite/action.do? ).
> No response at all is sent to the client.
>
> Is this something known or is only me experiencing that problem. I know
> that the url should not really containts the ending "?", but I can't
> control that.
>
> Cheers
>
> Nicolas
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