jstack: Target process not responding
I think you need to run jstack as the same user that runs the Tomcat process. Note also that jps only returns processes for the current user. You would get the pid for the Tomcat process by running jps with sudo or as the Tomcat process user.
This bug report may also be useful: https://bugs.launchpad.net/ubuntu/+source/sun-java6/+bug/597098
I got it working by doing two things:
- Changed call to:
sudo -u tomcat6 jstack -J-d64 -m pid - Replaced OpenJDK with Sun's original sun-6-jdk and sun-6-jre packages
Explanation for part 1: I switched to 64-bit mode, used sudo and run the command as Tomcat user.
Note: Part 2 might not be necessary. For some users it seems like part 1 is enough. In fact, try to add just the sudo command first. It might already do the trick.
@Valmar, I find the same topic post here. Unable to get thread dump? Any ideas why my app blocks?
It seems the workaround is sudo -u tomcat6 kill -3 <pid>.
Try to switch to process user and then use jstack:
sudo -u {process user} jstack > dump