JAVA_HOME is an operating system environment variable that directs a user to the file system location where the JDK or JRE was installed.

The JAVA_HOME environment variable should point to the root of the directory in which you installed the JDK and you should add the JAVA_HOME/bin directory to your PATH environment variable.

Pointing your JAVA_HOME environment variable to the JDK’s installation directory enables any external Java-dependent software that you might subsequently install to locate your JDK installation.

What does environment variable actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

With Java installed on Ubuntu and the JAVA_HOME environment variable properly configured, you're ready to start using and enjoying all your favorite Java-based software.