This is generally slower than running applications that have already been compiled into Java bytecode, and may not be suitable if you plan to execute applications many times.Ĭheck the version of the JRE to verify that it has been properly installed: java -versionĪs of the time of this publication, this command should return: openjdk version '11.0.7' LTS While you can run Java applications directly with the JRE, your applications will be compiled every time they are executed. Install the OpenJDK 11 development kit, which includes OpenJRE 11: sudo apt-get install openjdk-11-jdkĪlternatively, if you simply want to run Java applications that you have already downloaded, you can choose to only install OpenJRE 11: sudo apt-get install openjdk-11-jre This guide will use sudo commands wherever possible, which should be run by a limited, non-root user on your Linode.Įnsure your system is up-to-date: sudo apt-get update & sudo apt-get upgrade Before You Beginįamiliarize yourself with our Getting Started guide and complete the steps for connecting to your Linode with SSH and setting your Linode’s hostname and timezone.Ĭomplete the sections of our guide on Securing Your Server to create a standard user account, harden SSH access and remove unnecessary network services. For this reason, OpenJDK 11 is the recommended version for developing production applications. While there are many available versions of OpenJDK, version 11 is the latest Long-Term-Support (LTS) release as of the time of this guide’s publication.

OpenJDK and Java SE are equivalent JDKs that include a Java runtime environment (JRE) and tools for developing and compiling Java applications. OpenJDK is the free and open-source implementation of the Oracle Java Standard Edition (Java SE) Development Kit.

This guide will show you how to install the Open Java Development Kit (OpenJDK) 11 on Ubuntu 18.04. Software written in Java can be compiled and run on any system, making Java a versatile platform that can be used to create anything from software to basic web applications. Java is one of the world’s most popular programming languages.

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