jdk/src/share/classes/sun/java2d/SunGraphicsEnvironment.java

@@ -163,11 +163,15 @@
 
     /**
      * Returns the default screen graphics device.
      */
     public GraphicsDevice getDefaultScreenDevice() {
-        return getScreenDevices()[0];
+        GraphicsDevice[] screens = getScreenDevices();
+        if (screens.length == 0) {
+            throw new AWTError("no screen devices");
+        }
+        return screens[0];
     }
 
     /**
      * Returns a Graphics2D object for rendering into the
      * given BufferedImage.