If you want, I can:
Because jstack is not a standalone package, you cannot install it via sudo apt-get install jstack . Instead, it comes bundled with the Java Development Kit (JDK). Step 1: Check if jstack is Already Installed
Since jstack is bundled with the JDK, you need to install a JDK (not just JRE).
This is the simplest method for most users. OpenJDK is the open-source reference implementation of the Java Platform and is readily available in Ubuntu's official repositories.
Is your application , hanging , or showing high CPU usage ? Is this a production or development environment?
If both commands return a version number, jstack is successfully installed and ready to use. Step 4: Configure Environment Variables (Optional)
You need the target process ID to run the utility. Find it using jps (Java Virtual Machine Process Status Tool): jps -l Use code with caution. 2. Generate a Thread Dump
Scroll to the very bottom of the file and append the following lines (adjust the directory name if your JDK version is different):
Because jstack is not a standalone package, you must install the Java Development Kit (JDK) to get it. This article covers how to install, verify, and use jstack on Ubuntu. Prerequisites Before starting, ensure you have: A system running Ubuntu (20.04, 22.04, 24.04, or newer). Access to a terminal window. A user account with sudo privileges. Step 1: Update Your System Package Index
After building and running a container from this image, you can use docker exec -it <container_name> bash to enter the container and run jstack on any Java process running within it.
This will list all running Java applications with their PIDs and fully qualified class names. 2. Capture the Thread Dump
Visit the Oracle JDK download page and obtain the .tar.gz file for your desired version and architecture (e.g., jdk-21_linux-x64_bin.tar.gz ). You can download it with wget :
This method provides more flexibility, allowing you to install a specific build from Oracle, Adoptium, or another vendor. It's particularly useful for development environments where you need a non-standard version or for servers with strict security policies that restrict internet access.
Extract the downloaded archive to a directory of your choice. A common location is /opt/ for manually installed software.
