a collegue of mine tried to run our application under Linux and installed JavaFX and OpenJDK7 (jdk 1.0.0_09).
He tried to launch our .jar and the Ensemble.jar from Oracle. Both bring the same error in a JavaFX Launcher Window:
"This application requires a newer version of the Java runtime. Please download and install the latest Java runtime from java.com. Then restart the application."
He then installed Eclipse and started our application from there and it worked.