Why is JAVA_HOME not set?

The JAVA_HOME is set to an invalid directory fix All you need to do to fix this error is edit the JAVA_HOME variable and point it to the correct directory . The JAVA_HOME environment variable must point to the root of the installation folder of a JDK.

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Do I need Java for JDK?

JRE (Java Runtime), which include a Java Virtual Machine and core libraries, is needed for running Java programs. JDK (Java Development Kit), which includes JRE plus the development tools (such as compiler and debugger), is need for writing as well as running Java programs .

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