Things on this page are fragmentary and immature notes/thoughts of the author. Please read with your own judgement!

Point to the JDK directory if you can. Otherwise, point it to the JRE directory.

References

https://docs.oracle.com/cd/E19182-01/820-7851/inst_cli_jdk_javahome_t/

https://www.quora.com/What-is-the-use-of-JAVA_HOME