It seems there are still some dependencies being worked out for the build process. See:
Cannot build JavaFX modules with boot JDK that does not already include them https://bugs.openjdk.java.net/browse/JDK-8189111
The workaround mentioned on the OpenJFX mailing list (<email address hidden>) is to use the Oracle JDK 9 build as the boot JDK.
It seems there are still some dependencies being worked out for the build process. See:
Cannot build JavaFX modules with boot JDK that does not already include them /bugs.openjdk. java.net/ browse/ JDK-8189111
https:/
The workaround mentioned on the OpenJFX mailing list (<email address hidden>) is to use the Oracle JDK 9 build as the boot JDK.