Install Jstack On Ubuntu May 2026

jstack is a JVM diagnostic tool that prints Java thread stack traces for a given Java process (core dump, remote process, or live JVM). It is invaluable for:

sudo apt install openjdk-21-jdk

Error: "Operation not permitted"

# Use sudo or run as the same user owning the process
sudo jstack <PID>

Error: "Unable to attach to PID"

# Ensure JDK version matches the Java process version
java -version
jstack -version

# List Java processes
ps aux | grep java
sudo apt install openjdk-21-jdk

jstack is a command-line utility that prints Java stack traces of running Java processes. It's an essential tool for debugging thread deadlocks, analyzing high CPU usage, and troubleshooting performance issues in Java applications. install jstack on ubuntu

To use jstack, find the process ID (PID) of the Java process you want to analyze:

ps aux | grep java

Then, run jstack with the PID:

jstack <PID>

This will output the thread stacks of the Java process.

sudo apt install openjdk-17-jdk