jstack is a command-line utility that comes with the Java Development Kit (JDK). It prints Java stack traces of threads for a given Java process, helping debug deadlocks, thread contention, and performance issues.
To locate the exact binary:
update-alternatives --list jstack
Or:
ls -la /usr/bin/jstack
Typically, jstack will be symlinked to /usr/lib/jvm/java-11-openjdk-amd64/bin/jstack. install jstack on ubuntu
If you have multiple JDK versions installed, you can switch the default:
sudo update-alternatives --config java
sudo update-alternatives --config jstack
The jstack command is part of the Java Development Kit (JDK), specifically the openjdk-xx-jdk package (where xx is the Java version).
Here’s a detailed, feature-length guide to installing and using jstack on Ubuntu. jstack is a command-line utility that comes with
sudo apt update
sudo apt install openjdk-17-jdk-headless
The -headless version includes jstack, jmap, jstat, etc., but not GUI tools.
sudo apt install openjdk-17-jdk
Since jstack is bundled with the JDK, you need to install a JDK (not just JRE). Or:
ls -la /usr/bin/jstack
# List Java processes ps aux | grep java
jstack -l <PID> > full_thread_dump.txt