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OpenJDK is the open-source implementation of Java and comes packaged with Ubuntu.

Furthermore, there are two main installation options of Java to choose from. The JRE is used to actually execute Java programs. The JDK provides essential software tools to develop in Java, such as a compiler and debugger.

One Ubuntu 22.04 server set up by following the the Ubuntu 22.04 initial server setup guide tutorial, including a sudo non- root user and a firewall.Īn installation of Java comes with two main components.

When you’re finished, you’ll be able to use the JDK to develop software or use the Java Runtime to run software. You’ll then select the version you wish to use for your projects. You’ll install OpenJDK as well as the official JDK from Oracle. In this guide, you will install various versions of the Java Runtime Environment (JRE) and the Java Developer Kit (JDK) using apt. Java and the JVM (Java’s virtual machine) are required for many kinds of software, including Tomcat, Jetty, Glassfish, Cassandra and Jenkins.