• Get the PID of Java
    • ps -el | grep java
    • top | grep java
  • jstack  -F <your-pid> >dump.log
  • sudo jstack -F `pidof java` > /tmp/`hostname`_threaddump_`date +”%Y%m%d_%H%M”`.txt
  •     Result: [email protected]:~$ jstack -F 31987 > dump_22_09_2015_3.log Attaching to process ID 31987, please wait… Debugger attached successfully. Server compiler detected. JVM version is 24.76-b04 Sometimes following error might occur: 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 Solution:
    • jstck must be run as the same user as the java process which in my case is Jetty.
    • sudo -u jetty jstack <your-pid> > dump.log
      job done!!!