I've tried the javafx tutorial example "Example 11-3 Using a Scroll Pane to View Images" (http://docs.oracle.com/javase/8/javafx/user-interface-tutorial/scrollpane.htm).

The arrow buttons on the vertical scrollbar does not work and scrolling by keyboard won't work too.
If the code "sp.setVmax(440);" is commented, then the buttons and keyboard work.

If you print the new_val from the listner all the time on console, you will see, that even the ScrollPane isn't scrolling, the listener fires and create some crazy values.