Jetty server crashed with 300 users online on comet ajax.

[socoban]

I have Ubuntu 9.10
package undetected
W: Unable to locate package pkgname

My java app crashed. The hs_err.log file is here. In that file is written that you can help me. The log file can be downloaded here:

 http://chessfriends-release.s3.amazonaws.com/logs/hs_err_pid10930.log?AWSAccessKeyId=AKIAJP5BYGKOCMCDVZHA&Expires=1305128715&Signature=XEZMuJ0xNSM6YTcdwsI04ahhiYk%3D

I am not able to install newest version of ubuntu, so I can't you provide test on newest release. But My app is crashing once a day.

thanks for any help.