Tomcat's ThreadDump Collection
I am trying to get the JVM threaddump. I used top and ps aux to find the process id and user pid [who is root].
So, I run the following command to get the threaddump
sudo -u root jstack -F PID> threaddump1.txt
But I am getting the following exception ---------------------------------
Error while connecting to process: not a HotSpot virtual machine (could not find symbol "gHotSpotVMTypes" in remote process)
sun.jvm.hotspot.debugger.DebuggerException: Doesn't appear to be a HotSpot VM (could not find symbol "gHotSpotVMTypes" in remote process)**
at sun.jvm.hotspot.HotSpotAgent.setupVM(HotSpotAgent.java:411)
at sun.jvm.hotspot.HotSpotAgent.go(HotSpotAgent.java:305)
at sun.jvm.hotspot.HotSpotAgent.attach(HotSpotAgent.java:140)
at sun.jvm.hotspot.tools.Tool.start(Tool.java:185)
at sun.jvm.hotspot.tools.Tool.execute(Tool.java:118)
at sun.jvm.hotspot.tools.JStack.main(JStack.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.tools.jstack.JStack.runJStackTool(JStack.java:140)
at sun.tools.jstack.JStack.main(JStack.java:106)
Any help or suggestion or input is deeply appreciated.
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Ok. I was finally able to sort out the problem. The cat worked under the docker. So I have to run commands in docker. I followed the steps below.
1. Access the docker
2. Find the PID of tomcat by running command within docker.
3. Run command /<oracle path>/bin/jstack PID >> filename
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