Install Jstack On Ubuntu
If you don't need GUI support, use the headless version to save space: sudo apt install openjdk- -jdk-headless Use code with caution. Copied to clipboard Ask Ubuntu 3. Verify the Installation Once installed, confirm that is in your system's PATH: jstack -version Use code with caution. Copied to clipboard
jstack <PID> > thread_dump.txt
Ensure you run the command with sudo or precisely match the OS user account executing the JVM instance. To help me tailor this setup to your system, tell me: Which Java version does your application use? install jstack on ubuntu
jstack -version
Pass the PID to jstack to print the real-time thread dump to your terminal: jstack Use code with caution. 3. Save the Output to a File If you don't need GUI support, use the
Installing JDK and taking a jstack threads dump or stack dump
jstack -version
# Alternative using jcmd (JDK 7+) jcmd <PID> Thread.print > thread_dump.txt
First, find the PID of the misbehaving Java process (e.g., 12345 ). Then, find the internal thread ID that is consuming high CPU by running top -H -p 12345 . Convert that thread's decimal ID to hexadecimal. You can then grep for that hex value in your jstack output to see exactly what that specific thread is doing. Troubleshooting: "Well-known file is not secure" Copied to clipboard jstack <PID> > thread_dump
If you already have Java installed but jstack is missing, you are likely running a JRE (Java Runtime Environment) instead of a JDK. You do not need to reinstall Java; you can simply install the matching headless development tools. Step 1: Identify Your Current Java Version Check your running Java version: java -version Use code with caution. Example output: openjdk version "17.0.x" Step 2: Install the Matching JDK Package
This should help you get jstack installed and working on your Ubuntu system.