If multiple versions of Java are installed, use the following command to select the active one: Ask Ubuntu sudo update-alternatives --config java Use code with caution. Copied to clipboard 4. Basic Usage , you need the Process ID (PID) of your running Java application. You can find it using (also included in the JDK) or Oracle Help Center # Find the PID # Capture a thread dump to a file jstack > thread_dump.txt Use code with caution. Copied to clipboard Always run
JStack is a command-line tool that comes with the JDK (Java Development Kit). It allows you to take a snapshot of the JVM thread stacks, which can be used to diagnose and troubleshoot Java applications. JStack is particularly useful when you're experiencing performance issues, deadlocks, or other problems with your Java application. install jstack on ubuntu
# Use sudo or run as the same user owning the process sudo jstack <PID> If multiple versions of Java are installed, use
Then, capture a thread dump:
If you are on a server without a GUI, you can save space with the headless version: sudo apt install openjdk- 17 -jdk-headless Use code with caution. Copied to clipboard 3. Verify the Installation You can find it using (also included in