Programs that get JAVA_HOME on startupĪny Java-written program will require a Java-based environment in which to run. Another option is to echo JAVA_HOME in a command window. One way to find JAVA_HOME is to open the environment variable editor and view its assigned value. It is important for a user to easily find the JAVA_HOME value and verify that it is set properly. With the environment variables editor, a user can add a new system variable named JAVA_HOME and assign it the value of the location of the JDK install directory. How to set JAVA_HOME on WindowsĪ user can set JAVA_HOME on Windows through the administrative option in the 'Edit System Variables' window. After the location of the JDK or JRE installation is found, those programs can initiate Java-based processes, start Java virtual machines and use command line utilities such as the Java archive utility or the Java compiler, both of which are packaged inside the Java installation's in directory. Instead, other programs installed on a desktop computer that require a Java runtime will query the OS for the JAVA_HOME variable to find out where the runtime is installed. The JAVA_HOME environment variable is not actually used by the locally installed Java runtime. This variable should be configured on all OS's that have a Java installation, including Windows, Ubuntu, Linux, Mac and Android. The JAVA_HOME environment variable points to the file system location where the JDK or JRE was installed. 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.

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