The Java client references the java.sql.Timestamp class at some point and it seems the JavaFX SDK does not contain it.
I'm not familiar with JavaFX, but there may be a way to support the java.sql classes in a modified SDK.
A first glance at the Java client code reveals that it could be possible to get rid of the dependency on java.sql.Timestamp. I'll let you know if I manage to find a way.