Learn how to fix The registry refers to a nonexistent Java Runtime Environment installation or the Runtime is corrupted error on Windows 11/10.

Is Java installed? To run the Java command, first you must have Java installed. This means either the Java Runtime Environment (JRE) or the full Java Development Kit (JDK).

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