Have questions or run into a unique issue? Leave a comment below or check the official OpenJDK documentation for your specific Ubuntu release.
The results were... a mixed bag. The top answer on StackOverflow confidently shouted, " sudo apt install openjdk-XX-jdk " (insert your favorite version number for XX).
sudo jstack -F <pid>
The which command should return a path like /usr/bin/jstack . Step 4: Configure Environment Variables
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This installs the latest stable version of OpenJDK and includes jstack . jstack -version Use code with caution.
If you need a specific JDK version not available in the Ubuntu repositories, use this method. Have questions or run into a unique issue
| Tool | Description | Installation | |------|-------------|--------------| | jcmd | Part of JDK, can also generate thread dumps ( jcmd <PID> Thread.print ) | Same as jstack | | kill -3 | Sends a SIGQUIT to the JVM, printing thread dump to stdout (often to application log) | No installation needed, but output goes to catalina.out or systemd journal | | VisualVM | GUI tool (requires JDK as well) | sudo apt install visualvm | | async-profiler | Advanced profiling, includes stack traces | Requires JDK to build |
Include the -l option to capture lock information unless you have a specific reason not to. This provides crucial details for deadlock detection and thread analysis. a mixed bag
But for most cases, installing the full JDK is simpler.
jstack <PID> > thread_dump.txt
