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> > [02/05/2000 16:11:00:291] (ERROR) ajp12: Servlet Error:
> > java.lang.ArrayIndexOutOfBoundsException: 4761600: 4761600
>
> This doesn't look like something JServ would generate. It looks like it is
> coming from a buggy servlet.
You are correct. Since last writing, I have identified the buggy Servlet,
however I haven't found the cause.
> > I'm at a loss. There are something like 30 different users on the system
with
> > their own zones, so I don't have full awareness of all the code which
runs,
> > but theoretically it shouldn't be possible for one Servlet in a zone to
take
> > down the engine, should it?
>
> Hell ya it is possible!
>
> Try putting System.exit() in a servlet and see what happens. :-)
>
> We currently offer ZERO security within JServ for malicious servlets.
> There is a proposal on the java-apache@ list for adding security, but we
> haven't approved it to go into the distribution yet...it is on my TODO
> list...
I see. Thank you, this helps me to understand how this happens.
> > I have combed the logs, but I can't find a consistent killer. I'm about
to
> > write a Perl program to periodically poll the server and restart Apache to
fix
> > this, but that feel kludgy. Does anyone have any suggestions on this?
>
> Nope. :-(
I am not sure if I "solved" the problem, but I have managed to avoid it by
tuning the memory settings for the JVM. Below is what I set in the
jserv.properties:
wrapper.bin.parameters=-Xms128m -Xmx256m -Xss500k -Xoss1m
My system has 256mb of RAM, on Solaris 2.7 for SPARC, Java 1.2 and JServ 1.1.
Because I'm paranoid, I went ahead and wrote a script to check for errors and
to reboot the server. Here it is if anyone would find it useful or would like
to offer correction for my quick hack:
#!/bin/ksh
restart_cmd='/usr/local/apache/bin/apachectl restart'
error_msg='java.lang.ArrayIndexOutOfBoundsException'
Date=`date +%D`
Time=`date +%T`
output=`tail -20 /usr/local/jserv/logs/jserv.log | grep $error_msg`
if [[ $output != "" ]]; then
$restart_cmd # restart web server
echo "$Date $Time: Restarting server" >>
/usr/local/jserv/logs/serverCheck.log
else
echo "$Date $Time: Server check was fine" >>
/usr/local/jserv/logs/serverCheck
.log
fi
I have this in the root crontab running every 5 minutes. I realize it has the
potential of restarting the server, even after things are corrected, but it
does the trick until I refine it. Jon... many thanks for the input.
Duane Gran
http://www.spinweb.net
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