You must run jstack as the same user who started the Java process, or use sudo .
JDK not installed, JDK bin directory not in PATH , or only JRE installed (jstack requires full JDK).
sudo apt update sudo apt install openjdk-11-jdk
If you need a specific version (like Java 17 or 21), use the specific package name: BlueVPS.com OpenJDK 17: sudo apt install openjdk-17-jdk OpenJDK 21: sudo apt install openjdk-21-jdk 3. Verify the installation Once installed, check that is available in your path: jstack -version Use code with caution. Copied to clipboard Basic Usage install jstack on ubuntu
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.
If you get a "command not found" error, you need to install the JDK. perifery.atlassian.net 2. Install the JDK via apt The easiest way is to install the default-jdk
The -l flag adds lock information and will explicitly report found deadlocks at the end. You must run jstack as the same user
Don't just dump the output to the screen; save it for analysis: jstack > thread_dump.txt Use code with caution. Copied to clipboard If you're still having trouble, I can help you: Find your Process ID (PID) Troubleshoot "Permission Denied" errors Analyze the thread dump once you've generated it
To install on Ubuntu, you must install a full Java Development Kit (JDK) . While the Java Runtime Environment (JRE) allows you to run Java applications, it does not include diagnostic tools like jstack , jmap , or jcmd . Step 1: Check for Existing Installations
# Update the package list sudo apt update Verify the installation Once installed, check that is
jstack is a command-line utility that prints Java stack traces of running Java processes. It’s part of the . Given a Java process ID (PID), jstack can show you:
java -version
If you haven't already, install the JDK on your Ubuntu system:
jstack -l 12345 > thread_dump_$(date +%Y%m%d_%H%M%S).txt