If your application requires a specific Java version (Java 11 is a common Long-Term Support version), you should install that specific JDK.
Depending on the Java version you discovered in Step 1, choose the matching command below to install the JDK. Option A: Install the Default JDK
Add the following line to the file:
If you need a specific version to match your running application (e.g., Java 17), use: sudo apt install openjdk-17-jdk Use code with caution. install jstack on ubuntu
Error: "Unable to open socket file: target process not responding or HotSpot VM not loaded"
If you try to run jstack and get a "command not found" error, it usually means you only have the installed, or Java is missing entirely. To get jstack , you must install the full JDK. Prerequisites
If your application requires a specific Java version (such as Java 11, 17, or 21), you can install it directly: sudo apt install openjdk-21-jdk -y For Java 17: sudo apt install openjdk-17-jdk -y For Java 11: sudo apt install openjdk-11-jdk -y Step 4: Verify the jstack Installation If your application requires a specific Java version
On Ubuntu, jstack is not installed as a standalone tool. Instead, it comes packaged with the Java Development Kit (JDK). This guide covers how to install, verify, and troubleshoot jstack on Ubuntu. Prerequisites Before starting, ensure you have: An Ubuntu system (works on 20.04, 22.04, 24.04, and newer). Sudo privileges on the machine. A running Java application (to test the installation). Step 1: Update Your System Packages
| Issue | Solution | |-------|----------| | jstack: command not found | JDK not installed or not in PATH | | Operation not permitted | Run with sudo or the same user as the Java process | | Unable to open socket file | Java process may be using a different JVM (e.g., IBM, GraalVM) | | PID not found | Process not running or you don't own it |
The correct approach is to run jstack as the same user who owns the Java process. If a Java application was started by appuser , you should do: Error: "Unable to open socket file: target process
jps -l
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
This command will output the path to the jstack command, usually /usr/lib/jvm/java-8-oracle/bin/jstack or similar.
/usr/lib/jvm/java-17-openjdk-amd64/bin/jstack -version
sudo tar -xzf jdk-17_linux-x64_bin.tar.gz -C /opt