Install Oracle JDK 21 on Ubuntu / Debian

In this guide, you will learn to Install the latest long-support release of Oracle Java JDK which is JDK 21 on Ubuntu and Debian Linux. Oracle Java or Oracle JDK is a popular Java platform that provides useful tools and libraries for developing Java apps. At the current time, the LTS version is JDK 21 which is supported until Sep 2026. Also, the packages are available for free.

You can follow this guide to get the installation steps on Ubuntu and Debian Linux including Ubuntu 22.04 and Debian 12.

Quickly Install Oracle JDK 21 on Ubuntu / Debian

Before you start your JDK 21 installation, you must log in to our Ubuntu and Debian Linux as a non-root user with sudo privileges. You check the following initial guides:

Initial Server Setup with Ubuntu 22.04

Initial Server Setup with Debian 12

In this guide, to show you the guide steps we use Ubuntu 22.04. Now proceed to the following steps to complete this guide.

Step 1 – Download JDK 21 on Debian and Ubuntu Linux

First of all, you must visit the Official Oracle Java Website and get the latest Debian binary packages. To do this, you can use the following wget command:

sudo wget https://download.oracle.com/java/21/latest/jdk-21_linux-x64_bin.deb

Example Output:

Download Oracle Java Deb Package

Step 2 – Installing Oracle JDK 21 on Debian and Ubuntu

Once your download is completed, you can install your JDK 21 deb package on your server by using the following command:

sudo dpkg -i jdk-21_linux-x64_bin.deb

Example Output:

Install Oracle Java 21 Deb Package

Then, you can verify your installation by checking the Java version:

java --version

Example Output:

Check JDK 21 version

Step 3 – Check Java JDK Installation Path on Debian and Ubuntu

At this point, you can use the following command to check your JDK 21 path installation on your server:

sudo update-alternatives --config java

Example Output:

Check Java JDK Installation Path on Debian and Ubuntu

In my case, the Java path is located under the /usr/lib/jvm/jdk-21-oracle-x64/bin/java directory.

Now you can proceed to the next step to configure your environment path for Java.

Step 4 – Set up Java JDK 21 Environment Path on Debian and Linux

To set up the Java environment path, you must open the /etc/environment file with your desired text editor like Vi editor or Nano editor:

sudo vi /etc/environment

At the end of the file, add the following line, making sure to replace the path with your own, and not include the bin/ portion of the path:

JAVA_HOME="/usr/lib/jvm/jdk-21-oracle-x64"

Note: This file may be blank.

Set up Java JDK 21 Environment Path

When you are done, save and close the file.

Then, run the following command to apply the changes:

source /etc/environment

Also, you can verify your Java Home Path with the command below:

echo $JAVA_HOME
Exmaple Output
/usr/lib/jvm/jdk-21-oracle-x64

Step 5 – Test Oracle JDK 21 Installation on Debian and Ubuntu

At this point, we want to create a sample Hello World project to check if JDK 21 is working correctly. To do this, create and open a file with the command below:

sudo vi HelloWorld.java

Add the following sample Java code to the file:

public class HelloWorld {

    public static void main(String[] args) {
        // Prints "Hello, World" to the terminal window.
        System.out.println("Hello, World");
    }

}

When you are done, save and close the file. Then, compile and run your Java code with the command below:

sudo java HelloWorld.java
Exmaple Output
Hello, World

That’s it you are done. Now you can start to use your Oracle Java on your Debian-based distros.

Conclusion

At this point, you have learned to Install the latest long-support release of Oracle Java JDK which is JDK 21 on Ubuntu and Debian Linux. Also, you configured your Java environment home path and tested your installation by using a sample project.

Hope you enjoy using it. You may be interested in these articles too:

Install Plesk on Debian 12 From CLI

Set up Oracle JDK 21 on Fedora Linux 39

Configure Default Java with APT on Ubuntu

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