I am not sure if this is what you want but you can give it a try.
Select your project and (clean &) build it. Then click the Files tab , select your project and check under the dist
folder. There you will find, among others, a .jar
file. click the file and your application will run.
I am using NetBeans 8.0 and have loaded one of the samples for JavaFX:DigitalClock