When running jstack , you may occasionally encounter an error that looks like this: 12345: well-known file is not secure
You need the Process ID (PID) of your Java app to use it. Use jps (another JDK tool) to find it quickly: jps -l Use code with caution. Copied to clipboard install jstack on ubuntu
jstack --help
jstack 2345 > threaddump.txt
jstack -version
After the installation completes, verify the JDK is correctly installed: When running jstack , you may occasionally encounter