FULL PRODUCT VERSION :
java version "1.8.0_73"
Java(TM) SE Runtime Environment (build 1.8.0_73-b02)
Java HotSpot(TM) 64-Bit Server VM (build 25.73-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
In a swing window, with jvm option -Djavafx.embed.singleThread=true
when I click on a JButton with CTRL (or SHIFT),
THEN the modifiers of the ActionEvent is always 0


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
In a swing window, with jvm option -Djavafx.embed.singleThread=true
when I click on a JButton with CTRL (or SHIFT),
THEN the modifiers of the ActionEvent is always 0

See code sample to reproduce problem:

    public static void main(String[] args) {

        JFXPanel jfxPanel = new JFXPanel();

        JButton button = new JButton("Another test");
        button.addActionListener(e -> System.out.println(e.getModifiers()));

        JPanel panel = new JPanel(new BorderLayout());
        panel.add(button);

        JFrame frame = new JFrame("Tests");
        frame.setContentPane(panel);
        frame.setSize(new Dimension(150, 150));

        SwingUtilities.invokeLater(() -> frame.setVisible(true));
    }

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The modifiers of ActionEvent should not be 0 if CTRL or Shift was used
ACTUAL -
The ActionEvent.getModifiers() always return 0

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

    public static void main(String[] args) {

        JFXPanel jfxPanel = new JFXPanel();

        JButton button = new JButton("Another test");
        button.addActionListener(e -> System.out.println(e.getModifiers()));

        JPanel panel = new JPanel(new BorderLayout());
        panel.add(button);

        JFrame frame = new JFrame("Tests");
        frame.setContentPane(panel);
        frame.setSize(new Dimension(150, 150));

        SwingUtilities.invokeLater(() -> frame.setVisible(true));
    }
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Do not use -Djavafx.embed.singleThread=true