title: How to find out JavaFX version
body: <p>This should be easy, but I can't figure out how.
  Is there any way to find out which JavaFX version is installed. And I DON'T mean programmatically via <code>System.getProperty("javafx.runtime.version")</code> , which returns an empty string on my computer, although JavaFX is installed.</p>
  
  <p>I would rather like to have something like <code>java -version</code> on console, but in order to get the JavaFX version.</p>
  
  <p>Alternatively it would be sufficient to know if JavaFX is installed at all. I just have some customers who can't run my swing/javaFX app and would like to tell them to check whether JavaFX is installed.</p>