Next, let’s look at how to install Oracle’s official JDK and JRE. If Java is not currently installed, you’ll see the following output: Next, check if Java is already installed: To install this version, first update the package index: By default, Ubuntu 20.04 includes Open JDK 11, which is an open-source variant of the JRE and JDK.
The easiest option for installing Java is to use the version packaged with Ubuntu. One Ubuntu 20.04 server set up by following the the Ubuntu 20.04 initial server setup guide tutorial, including a sudo non- root user and a firewall.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.
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