How To Install Oracle Java on Debian 10 Buster

In this tutorial, we will show you how to install Oracle Java on Debian 10 Buster. Many programs and scripts require java to run it, but usually, Java is not installed by default on VPS or Dedicated Server. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of Java on a Debian 10 (Buster) server.

Prerequisites

• A server running one of the following operating systems: Debian 10 (Buster).
• It’s recommended that you use a fresh OS install to prevent any potential issues.
• SSH access to the server (or just open Terminal if you’re on a desktop).
• A non-root sudo user or access to the root user. We recommend acting as a non-root sudo user, however, as you can harm your system if you’re not careful when acting as the root.

Install Oracle Java on Debian 10 Buster

Step 1. Before we install any software, it’s important to make sure your system is up to date by running the following apt commands in the terminal:

sudo apt update 
sudo apt upgrade

Step 2. Installing Oracle Java on Debian 10.

First, Go to the download page for the OpenJDK software package, and right-click on the tar.gz link found to the right of the “Linux” option. Click on “Copy link address” or “Copy link” or use the following commands to download from the command line:

wget --no-cookies --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" \
  http://download.oracle.com/otn-pub/java/jdk/11.0.2+9/f51449fcd52f4d52b93a989c5c56ed3c/jdk-11.0.2_linux-x64_bin.deb

Next, use the Debian package installer utility (dpkg) to install a downloaded Java package on your system:

dpkg -i jdk-11.0.2_linux-x64_bin.deb

Then, configure Java 11 as the default version on your system:

update-alternatives --install /usr/bin/java java  /usr/lib/jvm/jdk-11.0.2/bin/java 2
update-alternatives --config java

In Addition, There are some defaults to set as default for JDK installation. Execute the javac and jar as default commands to set:

update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-11.0.2/bin/jar 2
update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-11.0.2/bin/javac 2
update-alternatives --set jar /usr/lib/jvm/jdk-11.0.2/bin/jar
update-alternatives --set javac /usr/lib/jvm/jdk-11.0.2/bin/javac

Verify the installed Java version:

java -version

Step 3. Set Java Environment Variables.

Now set all the required environment variables for Java. This file will automatically reload settings on system reboot:

sudo nano /etc/profile.d/jdk.sh

export J2SDKDIR=/usr/lib/jvm/jdk-11.0.2
export J2REDIR=/usr/lib/jvm/jdk-11.0.2
export PATH=$PATH:/usr/lib/jvm/jdk-11.0.2/bin:/usr/lib/jvm/jdk-11.0.2/db/bin
export JAVA_HOME=/usr/lib/jvm/jdk-11.0.2
export DERBY_HOME=/usr/lib/jvm/jdk-11.0.2/db

Then load these settings to the currently active shell also:

source /etc/profile.d/jdk.sh

Congratulations! You have successfully installed Java. Thanks for using this tutorial for installing Oracle Java (JRE or JDK) on Debian 10 Buster system. For additional help or useful information, we recommend you check the official Java website.