Lightweight Java installation on Windows

 Go to https://www.oracle.com/nl/java/technologies/downloads/ to download the JDK 2.0 x64 Compressed Archive

Unzip it in c:\prg\java\jdk20

Go to "This PC" and click "Advanced System Settings". Go to "Environment Variables..."

In System variables, create a variable JAVA_HOME with content C:\prg\java\jdk-20

In System variables, create a variable CLASSPATH with content C:\prg\java\antlr\antlr-4.12.0-complete.jar;%CLASSPATH%

In System variables edit the Path variable and add C:\prg\java\jdk-20\bin