jar not required external dependencies (the only requirements is Java 7)
jar composed in JavaFX layout
size is 388Kb and 423Kb
You may try to start it under Java 6 ;-)
How to build JavaFX? sbt> application:package after this you will have for an example:
target/scala-2.9.2/package.jar - original jar
target/scala-2.9.2/package-proguard.jar - jar after proguard
target/scala-2.9.2/package-jfx.jar - jar after proguard with JavaFX layout
If interested, fork it or contact me and you will be granted with write access to repository.
P.S. most complex use case JavaFX application with Scala interpretor: - all classes must be processed with ProGuard except scala-library and scala-compiller - it must be single jar without external dependencies