With jstack installed, you now have a critical tool for peering into the internals of your Java applications on Ubuntu.
Once I actually installed the JDK, jstack worked like a charm. It gave me that sweet, sweet hexadecimal nid (native id) I needed to kill the runaway thread. It turns a chaotic CPU spike into a readable murder mystery. install jstack on ubuntu
Then, run jstack with the PID:
You can install the default Ubuntu JDK or a specific version. is the current Long Term Support (LTS) version. To install the default JDK: sudo apt install default-jdk Use code with caution. Copied to clipboard To install a specific version (e.g., Java 11 or 17): With jstack installed, you now have a critical