How to Install jstack on Ubuntu: A Complete Guide The jstack command-line utility is an essential tool for Java developers and system administrators. It prints Java thread stack traces for a given Java process, helping you diagnose performance bottlenecks, deadlocks, and high CPU usage.
This command installs the current stable LTS version of OpenJDK managed by Ubuntu. sudo apt install default-jdk -y Use code with caution. Option B: Install a Specific OpenJDK Version
In this example, 2345 is the PID of your target Java application.
: The Process ID of your running Java application (you can find this using the install jstack on ubuntu
# Basic thread dump jstack <PID>
sudo apt install openjdk-11-jdk -y
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 How to Install jstack on Ubuntu: A Complete
Usually, JDKs are installed in /usr/lib/jvm/ .
Before installing anything, check if Java is already installed and note its version number. This ensures you install the matching JDK diagnostics tools. Open your terminal and execute: java -version Use code with caution. You will see an output similar to this:
Once you have the PID (e.g., 12345 ), run jstack to output the thread dump to your terminal: jstack 12345 Use code with caution. 3. Save the Thread Dump to a File sudo apt install default-jdk -y Use code with caution
, as it is a diagnostic tool not included in the standard Java Runtime Environment (JRE). Stack Overflow 1. Verify Current Installation First, check if is already available on your system by running: >/dev/null; "jstack is Installed" "jstack is Not Installed" Use code with caution. Copied to clipboard If it is not found, you likely only have the JRE installed. perifery.atlassian.net 2. Install OpenJDK (Recommended)
Error: "Unable to open socket file: target process not responding or HotSpot VM not loaded"
If you see a response indicating "command not found," or if it points to a JRE instead of a JDK, you will need to proceed with the installation. Step 1: Install the Default JDK
This error occurs if you run jstack as a different user than the user running the Java application.
Now that you have JStack installed, let's walk through a basic example of how to use it: