Install Jstack | On Ubuntu !free!

If you have multiple JDK versions installed, you can switch the default:

ps aux | grep java Or:

| 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 | install jstack on ubuntu

ls -la /usr/bin/jstack Typically, jstack will be symlinked to /usr/lib/jvm/java-11-openjdk-amd64/bin/jstack .

jstack --version Or simply:

# Step 1: Update apt sudo apt update sudo apt install openjdk-11-jdk # For Java 11 sudo apt install openjdk-17-jdk # For Java 17 Step 3: Verify jstack --version Step 4: Find Java PID jps -l Step 5: Get thread dump sudo jstack 12345 Conclusion Installing jstack on Ubuntu is not about downloading a single tool, but about installing a complete Java Development Kit. While this may seem heavy-handed, the JDK offers numerous other utilities ( jstat , jmap , jconsole , jcmd ) that complement jstack in diagnosing JVM issues. By following this guide, you can reliably install jstack on any Ubuntu version (16.04 through 24.04) and start debugging Java thread problems immediately.

1.8.0_392 If your organization requires Oracle JDK, download the .deb package from the Oracle JDK download page . Then install it with dpkg : If you have multiple JDK versions installed, you

update-alternatives --list jstack Or: