Dedicated Server: Installation of Java
This guide was created with the following products:
(Details may vary with products from different providers but the main concepts remain the same)
Introduction
Java is a very popular programming language that is used worldwide for numerous programs and services. To run these programs based on Java it is absolutely necessary that Java is installed on the system. In the following you will learn how to install Java on your system for the offered Linux operating systems.
Preparation
Before starting the actual Java installation, it is important to make sure that the system is up to date. For this we connect to the server via SSH. If you don't know what SSH is and how to use it, please have a look at the following guide: Initial access (SSH)
Once there, the system can be updated with the following command, depending on the operating system:
// Debian
sudo apt-get update
// Ubuntu
sudo apt update
// CentOS
sudo yum update
// OpenSUSE
sudo zypper up
// Fedora
sudo dnf upgrade --refresh
Installation
After finishing the preparation, the Java installation can now be started. Depending on the operating system, the following commands must be executed:
Debian
sudo apt-get install default-jdk
Ubuntu
sudo apt install default-jdk
CentOS
sudo yum install java-11-openjdk
Fedora
sudo dnf install java-11-openjdk
Version-Check
You can check if the installation was successful with the java --version command. The output should look similar to the following:
openjdk 11.0.9.1 2020-11-04
OpenJDK Runtime Environment (build 11.0.9.1+1-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.9.1+1-Ubuntu-0ubuntu1.20.04, mixed mode)
In this case Java 11 was successfully installed on your system. Now you can easily run your Java applications on your system.