Not sure if it is an issue,
on 8u121 and 9 ea b157 javafx.version and javafx.runtime.version returns null
==
public static void main(String args[]) {
                System.out.println("java version: "+System.getProperty("java.version"));
                System.out.println("javafx.version: " + System.getProperty("javafx.version"));
                System.out.println("javafx.runtime.version: " + System.getProperty("javafx.runtime.version"));
                System.out.println("From runtime " + com.sun.javafx.runtime.VersionInfo.getRuntimeVersion());
        }
==

How tio check javafx version from commandline?