For most users, the simplest method is to install the Ubuntu default JDK package, which currently provides OpenJDK 21 on the latest LTS releases: sudo apt update Install the JDK: sudo apt install default-jdk
If both commands return a version number, jstack is successfully installed and ready to use. Step 4: Configure Environment Variables (Optional)
Apply the changes:
# Alternative using jcmd (JDK 7+) jcmd <PID> Thread.print > thread_dump.txt
For more details on managing Java versions, you can refer to guides on DigitalOcean Ubuntu Tutorials Do you need help finding the Process ID (PID) of your running Java application to use with jstack? How to get a jstack in Windows and Linux - Customer install jstack on ubuntu
Before proceeding with an installation, it's wise to check your current system state. jstack may already be available if you have a full JDK installed.
After the installation completes, verify that jstack is available in your system path. Check the installed version: jstack -version Use code with caution. Find the exact absolute path of the binary: which jstack Use code with caution. Expected output: /usr/bin/jstack Step 4: Configure Environment Variables (Optional) For most users, the simplest method is to
2345: Unable to open socket file: target process not responding or HotSpot VM not loaded
sudo apt install openjdk-21-jdk -y
Since jstack is bundled with the JDK, you have two primary options:
Run the container with the --cap-add=SYS_PTRACE flag or disable seccomp restrictions: jstack may already be available if you have