jdk/src/windows/classes/sun/awt/Win32GraphicsEnvironment.java

@@ -91,11 +91,13 @@
 
     protected native int getNumScreens();
     protected native int getDefaultScreen();
 
     public GraphicsDevice getDefaultScreenDevice() {
-        return getScreenDevices()[getDefaultScreen()];
+        GraphicsDevice[] screens = getScreenDevices();
+        int index = getDefaultScreen();
+        return screens[screens.length <= index ? 0 : index];
     }
 
     /**
      * Returns the number of pixels per logical inch along the screen width.
      * In a system with multiple display monitors, this value is the same for