When I use -Xcheck:jni on my swing application, there is this fatal error :

FATAL ERROR in native method: Bad global or local ref passed to JNI
at com.sun.glass.ui.win.WinScreen._getMainScreen(Native Method)
at com.sun.glass.ui.win.WinScreen.getMainScreen_impl(WinScreen.java:43)
at com.sun.glass.ui.win.WinApplication.staticScreen_getMainScreen(WinApplication.java:151)
at com.sun.glass.ui.Screen.getMainScreen(Screen.java:15)
at com.sun.javafx.tk.quantum.QuantumToolkit.getPrimaryScreen(QuantumToolkit.java:594)
at javafx.stage.Screen.updateConfiguration(Screen.java:102)
at javafx.stage.Screen.checkDirty(Screen.java:97)
at javafx.stage.Screen.getPrimary(Screen.java:176)
at javafx.stage.Window.centerOnScreen(Window.java:224)
at javafx.stage.Window$10.invalidated(Window.java:731)
at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:127)
at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:161)
at javafx.stage.Window.setShowing(Window.java:782)
at javafx.stage.Window.show(Window.java:797)
at com.sun.javafx.stage.EmbeddedWindow.show(EmbeddedWindow.java:57)
at javafx.embed.swing.JFXPanel.setSceneImpl(JFXPanel.java:278)
at javafx.embed.swing.JFXPanel.setScene(JFXPanel.java:245)
at Tests.Test.initFX(Test.java:41)
at Tests.Test.access$0(Test.java:38)
at Tests.Test$1.run(Test.java:33)
at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:173)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:73)
at java.lang.Thread.run(Thread.java:722)

It seems JNI doesn't like you initialize the JNI in the main thread and use the same objects in "Platform.runLater()" thread.
The error happened only with -Xcheck:jni option. But I guess there is a good reason it stopped.
I can reproduce it with the following example from Oracle's website (http://docs.oracle.com/javafx/2/swing/swing-fx-interoperability.htm)

Thanks helping me,
Alex

import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class Test {

    private static void initAndShowGUI() {
        // This method is invoked on the EDT thread
        JFrame frame = new JFrame("Swing and JavaFX");
        final JFXPanel fxPanel = new JFXPanel();
        frame.add(fxPanel);
        frame.setSize(300, 200);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Platform.runLater(new Runnable() {
            @Override
            public void run() {
            initFX(fxPanel);
            }
       });
    }

    private static void initFX(JFXPanel fxPanel) {
        // This method is invoked on the JavaFX thread
        Scene scene = createScene();
        fxPanel.setScene(scene);
    }

    private static Scene createScene() {
        Group root = new Group();
        Scene scene = new Scene(root, Color.ALICEBLUE);
        Text text = new Text();
        text.setX(40);
        text.setY(100);
        text.setFont(new Font(25));
        text.setText("Welcome JavaFX!");
        root.getChildren().add(text);
        return (scene);
    }
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
            initAndShowGUI();
            }
        });
    }
}