javac --module-path %PATH_TO_FX% --add-modules javafx.controls,javafx.fxml HelloFX.java
javac --module-path $PATH_TO_FX --add-modules javafx.controls HelloFX.java
javac --module-path %PATH_TO_FX% --add-modules javafx.controls HelloFX.java
set PATH_TO_FX="path\to\javafx-sdk-14\lib"
export PATH_TO_FX=path/to/javafx-sdk-14/lib
$ java -version openjdk version "12.0.2" 2019-07-16 OpenJDK Runtime Environment (build 12.0.2+10) OpenJDK 64-Bit Server VM (build 12.0.2+10, mixed mode, sharing)
javac --module-path $PATH_TO_FX --add-modules javafx.controls,javafx.fxml HelloFX.java