Window goes to the Bottom (and toFront does not help)

configuration: Ubuntu 15.04 Linux + Unity + JDK9 b39 (+ HiDPI monitor)

Please run the following test:


import java.awt.*;

public class WindowTest {

    private Window w = new Window((Frame) null);

    public WindowTest() {
            try {
                EventQueue.invokeAndWait(() -> {
                    w.setLocation(150, 150);
                    w.setSize(200, 200);
                    w.setBackground(Color.red);
                    w.setVisible(true);
                });
            } catch (Exception dummy) { System.err.println("nok"); }
    }

    public void tryToFront() {
            try {
                EventQueue.invokeAndWait(() -> {
                    w.toFront();
                });
            } catch (Exception dummy) { System.err.println("nok"); }
    }

    public static void main(String[] args) throws Exception {
        WindowTest test = new WindowTest();
        Thread.sleep(2000);
        test.tryToFront();
    }
}

the window goes under the terminal; toFront() doesn't help