Install Jstack On Ubuntu
sudo apt install openjdk-21-jdk
Verify that the JDK is installed correctly:
java -version
This should output the version of Java installed on your system.
jps
To use jstack to troubleshoot a Java application, follow these steps:
By following these steps, you should now have jstack installed on your Ubuntu system and be able to use it to troubleshoot Java applications.
To get jstack on Ubuntu, you don't install it as a standalone tool; it is included as part of the Java Development Kit (JDK). If you only have the Java Runtime Environment (JRE) installed, you will not have access to jstack. 1. Check if Java is already installed
First, see if you already have a JDK installed by checking the version: javac -version Use code with caution. Copied to clipboard
If this returns a version number (e.g., javac 17.0.x), jstack should already be available in your path. Try running jstack -help. If you see "command not found," proceed to the next step. 2. Update your package list Ensure your local package index is up to date: sudo apt update Use code with caution. Copied to clipboard 3. Install the JDK
You can install the default Ubuntu JDK or a specific version. OpenJDK 17 is the current Long Term Support (LTS) version. To install the default JDK: sudo apt install default-jdk Use code with caution. Copied to clipboard To install a specific version (e.g., Java 11 or 17):
sudo apt install openjdk-17-jdk # OR sudo apt install openjdk-11-jdk Use code with caution. Copied to clipboard 4. Verify the installation
Once the installation is complete, verify that jstack is functional: jstack -help Use code with caution. Copied to clipboard You should see the usage summary for the stack trace tool. 5. Troubleshooting: "Command not found" after install install jstack on ubuntu
If you installed the JDK but jstack still isn't recognized, you may need to add the Java bin directory to your system PATH or use update-alternatives: sudo update-alternatives --config java Use code with caution. Copied to clipboard
This ensures the system is pointing to the correct JDK directory. You can also find the exact location of the binary using: find /usr/lib/jvm -name jstack Use code with caution. Copied to clipboard Common Usage
To take a thread dump of a running Java process, find the Process ID (PID) and run: jstack Use code with caution. Copied to clipboard
To install on Ubuntu, you must install a full Java Development Kit (JDK) rather than just a Runtime Environment (JRE), as
is a serviceability tool included only in the JDK's binary folder. How to Install via Terminal The most efficient way to get
is to install the default OpenJDK package provided by Ubuntu's repositories. Update your package list sudo apt update Use code with caution. Copied to clipboard Install the Default JDK This package includes the Java compiler ( ) and diagnostic tools like sudo apt install default-jdk Use code with caution. Copied to clipboard Verify the installation Check if the command is now available in your path. Use code with caution. Copied to clipboard
is a vital diagnostic tool that prints Java thread stack traces for a given process. It is primarily used for: jstack - Oracle Help Center
The jstack utility is an essential tool for troubleshooting Java application performance issues, such as deadlocks or hung threads. On Ubuntu, it is part of the Java Development Kit (JDK) but is notably absent from the Java Runtime Environment (JRE). 1. Identify the Correct Package
To get jstack, you must install a full JDK package. Ubuntu’s default package manager, apt, provides several versions. The most common choice is the default JDK, which automatically points to the latest stable version (currently OpenJDK 21 for Ubuntu 24.04).
default-jdk: Installs the standard version recommended for your Ubuntu release. sudo apt install openjdk-21-jdk
openjdk-[version]-jdk: Installs a specific version, such as openjdk-17-jdk or openjdk-11-jdk.
openjdk-[version]-jdk-headless: A smaller package for servers without a GUI, which still includes jstack. 2. Installation Steps Follow these commands in your terminal to install jstack: Update the package index: sudo apt update Use code with caution. Install the JDK:To install the default version, run: sudo apt install default-jdk Use code with caution.
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.
Verify the installation:Check if jstack is now available in your system path: jstack -version Use code with caution. Does OpenJDK have a tool similar to jstack (Oracle Java)?
⭐⭐⭐☆☆ The "JDK Ariadne Thread" Reviewed by: A Frustrated Dev on Production Box
The Headline: A classic "Where’s Waldo" experience for system administrators.
The Experience:
I came into this looking for a specific tool: jstack. I had a Java process spinning at 100% CPU and I needed a thread dump, stat. I typed the query with high hopes.
The results were... a mixed bag. The top answer on StackOverflow confidently shouted, "sudo apt install openjdk-XX-jdk" (insert your favorite version number for XX).
The Plot Twist: Here is where the "product" fails the user.
The "Hack" (The Upside):
Once I actually installed the JDK, jstack worked like a charm. It gave me that sweet, sweet hexadecimal nid (native id) I needed to kill the runaway thread. It turns a chaotic CPU spike into a readable murder mystery. Verify that the JDK is installed correctly:
java -version
The Verdict: The query works, but it exposes the friction of Java ecosystem management on Linux. It’s not a one-click install; it’s a commitment to a specific Java version family.
Bottom Line: If you need jstack, you have to invite the whole jdk family to the party. Just make sure you check java -version before you start installing random packages, or you’ll break your existing application.
Would I search this again? Yes, but only because I have no other choice.
To install on Ubuntu, you must install the Java Development Kit (JDK)
. While the Java Runtime Environment (JRE) allows you to run Java applications,
is a troubleshooting tool specifically included in the JDK package. Stack Overflow 1. Update your package list
Before installing new software, ensure your local package index is up to date: sudo apt update 2. Install the JDK
You can install the default OpenJDK version provided by Ubuntu or a specific version (e.g., 17 or 21) based on your needs. DigitalOcean To install the default JDK (recommended): sudo apt install default-jdk To install a specific version (e.g., OpenJDK 17): sudo apt install openjdk-17-jdk 3. Verify the installation Once the installation is complete, verify that is available by checking its version or help menu: perifery.atlassian.net How to use jstack
After installation, you can generate a thread dump for a running Java process using its Process ID (PID): CloudBees Docs Find the Java PID: ps -e | grep java Run jstack: jstack
jstack is a Java utility that provides a snapshot of the Java Virtual Machine (JVM) thread stack traces. It's a useful tool for troubleshooting and diagnosing issues with Java applications.
sudo jstack -l 12345
The -l flag adds lock information and will explicitly report found deadlocks at the end.