The following, simple test program of the new no-argument Window() constructor
fails with an exception on Windows (it was either Windows 95 or 98--I didn't
try it on NT). It works fine on Solaris.

    java -version
    java version "1.3"
    HotSpot Client VM (1.3beta, mixed mode, build l)

    java WindowTest
    Exception in thread "main" java.lang.NullPointerException: peer
        at sun.awt.windows.WWindowPeer.createAwtWindow(Native Method)
        at sun.awt.windows.WWindowPeer.create(WWindowPeer.java:112)
        at sun.awt.windows.WComponentPeer.<init>(WComponentPeer.java:324)
        at sun.awt.windows.WCanvasPeer.<init>(WCanvasPeer.java:30)
        at sun.awt.windows.WPanelPeer.<init>(WPanelPeer.java:69)
        at sun.awt.windows.WWindowPeer.<init>(WWindowPeer.java:90)
        at sun.awt.windows.WToolkit.createWindow(WToolkit.java:221)
        at java.awt.Window.addNotify(Window.java:304)
        at java.awt.Window.show(Window.java:343)
        at java.awt.Component.show(Component.java:917)
        at java.awt.Component.setVisible(Component.java:875)
        at WindowTest.main(WindowTest.java:9)

If you change the "new Window()" call to "new Window(new Frame())" it
works.

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import java.awt.*;

public class WindowTest {
    public static void main(String[] args) {
        Window w = new Window();

        w.setLocation(100, 100);
        w.setSize(200, 200);
        w.setVisible(true);
    }
}
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