I have Tomcat 6 on Debian 5 on VPS. Sometimes Tomcat stop responses, and when I then checked server there is no Tomcat process and none exception to this in Tomcat logs.
How can I check what killed Tomcat process?
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You could try to search in syslog: /var/log/*
for the messages (syslog) use the following command:
and you will get the last 5 or so log messages.
here's an article on debians syslog: http://www.aboutdebian.com/syslog.htm
Take a look in /var/log/syslog. Probably your tomcat eat a lot of memory and the oom-killer is taking action: http://linux-mm.org/OOM_Killer
There's an article http://tomcat.apache.org/tomcat-6.0-doc/logging.html about the logging in tomcat. I haven't tried it but it looks promising.