javafx.embed.singleThread=true not working

[Hendrik Ebbers]

Hi,
I’m currently trying the experimental support of the javafx.embed.singleThread 
flag to mix the EDT and JFX Application Thread. Therefore I created a demo 
application. But when I start the app the following exception is thrown:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Not on 
FX application thread; currentThread = AWT-EventQueue-0

I think I’m doing something wrong but currently I have no idea why this is not 
working. Any ideas?

I’m using the folioing JavaFX version:

java version "1.8.0-ea"
Java(TM) SE Runtime Environment (build 1.8.0-ea-b123)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b65, mixed mode)

Here is the code of the demo application:

public class JFXPanelDemo1 {

    private static JButton swingButton;
    private static Button jfxButton;

    public static void main(String[] args) {


        SwingUtilities.invokeLater(() -> {
            JFrame swingFrame = new JFrame("Integrate JavaFX in Swing");
            swingFrame.getContentPane().setLayout(new BorderLayout());
            swingButton = new JButton("I'm a Swing button");
            swingFrame.getContentPane().add(BorderLayout.NORTH, swingButton);

            swingButton.addActionListener((e) -> {
                jfxButton.setDisable(!jfxButton.isDisable());
            });

            JFXPanel jfxPanel = new JFXPanel();
            swingFrame.getContentPane().add(BorderLayout.CENTER, jfxPanel);

            jfxButton = new Button("I'm a JavaFX button");
            StackPane jfxPane = new StackPane(jfxButton);
            Scene jfxScene = new Scene(jfxPane);
            jfxPanel.setScene(jfxScene);

            jfxButton.setOnAction((e) -> {
                swingButton.setEnabled(!swingButton.isEnabled());
            });

            swingFrame.setVisible(true);
        }
        );

    }
}