JAVA_HOME is an operating system (OS) environment variable which can optionally be set after either the Java Development Kit (JDK) or the Java Runtime Environment (JRE) is installed.

Learn how to set the PATH variable in macOS. The PATH variable is a file system environment variable that contains the location of commands and program files. In this article, you’ll learn how ...

However, Ubuntu allows you to reference the preferred Java install through the symbolic link default-java, which is the location that should be used to set environment variables like JAVA_HOME ...