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I am running Ubuntu server edition and I wanted to take a thread dump of Tomcat. So, I first tried to find out which PID tomcat uses: $ jps -l 5809 sun.tools.jps.Jps But it's not there? So, I used top instead and found out the PID 5730. Then I called jstack to get the thread dump: $ sudo jstack -l 5730 5730: Unable to open socket file: target process not responding or HotSpot VM not loaded The -F option can be used when the target process is not responding What's going on? :-( I already tried to export CATALINA_TMPDIR as described in Jstack and Jstat stopped working with upgrade to JDK6u23 but that didn't change anything: $ export CATALINA_TMPDIR=/tmp $ sudo /etc/init.d/tomcat6 restart * Stopping Tomcat servlet engine tomcat6 ...done. * Starting Tomcat servlet engine tomcat6 ...done. $ sudo jstack -l 5934 // new PID after restart 5934: Unable to open socket file: target process not responding or HotSpot VM not loaded The -F option can be used when the target process is not responding Update: I also tried sudo -u tomcat6 jstack -l -F 5730 > threaddumpexceptions2.txt but it only gives me tons of exceptions on the console.

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