![]() Many programs written with Java use the “JAVA_HOME” environment variable to determine where Java is installed. To do this, you need to run the command: java -versionīased on the message received, OpenJDK is installed correctly. Now you need to make sure that OpenJDK is installed correctly. To install the JDK, run the following command, which will also install the JRE: sudo apt-get install -y default-jdk You may need a Java Development Kit (JDK) in addition to the JRE in order to compile and run certain Java-based software. Update the local package index to the latest changes in the repositories using the command: sudo apt update We connect to the server on which you plan to install OpenJDK. This guide describes how to connect to a server using the iTerm2 terminal emulator installed on the macOS operating system. To install OpenSSH on a server, you can use the command: sudo apt install openssh-server ![]() ![]() In addition, OpenSSH must be installed on the server, and port 22 must be open in order to be able to connect to the server using the SSH protocol. You can read more about how to install Ubuntu Server 22.04 LTS in my guide “ Install Ubuntu Server 22.04 LTS”. In this guide, we will consider the case when you already have a server with the Ubuntu Server 22.04 LTS operating system installed on it. OpenJDK is free but will need to be updated every 6 months. The Oracle JDK build process is built from the OpenJDK source, so there isn’t much difference between Oracle JDK and OpenJDK. OpenJDK is an open-source implementation of the Java Standard Edition platform with contributions from Oracle and the Java open community. With the release of Java 11, Oracle JDK became commercial and is no longer free. This article is for those looking for a detailed and straightforward guide on installing OpenJDK on Ubuntu Server.
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