--- a/jdk/src/share/classes/java/awt/GraphicsDevice.java	Tue May 05 14:45:56 2009 +0400
+++ b/jdk/src/share/classes/java/awt/GraphicsDevice.java	Wed May 06 12:39:23 2009 +0400
@@ -282,7 +282,7 @@
                 w.setOpacity(1.0f);
             }
             Color bgColor = w.getBackground();
-            if (bgColor.getAlpha() < 255) {
+            if ((bgColor != null) && (bgColor.getAlpha() < 255)) {
                 bgColor = new Color(bgColor.getRed(), bgColor.getGreen(),
                                     bgColor.getBlue(), 255);
                 w.setBackground(bgColor);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/awt/FullScreen/TranslucentWindow/TranslucentWindow.java	Wed May 06 12:39:23 2009 +0400
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6837004
+ * @summary Checks that non-opaque window can be made a fullscreen window
+ * @author Artem Ananiev
+ * @run main TranslucentWindow
+ */
+
+import java.awt.*;
+import java.awt.geom.*;
+
+import static java.awt.GraphicsDevice.WindowTranslucency.*;
+
+import sun.awt.SunToolkit;
+
+public class TranslucentWindow {
+    public static void main(String args[]) {
+        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
+        GraphicsDevice gd = ge.getDefaultScreenDevice();
+
+        Frame f = new Frame("Test frame");
+        f.setBounds(100, 100, 320, 240);
+
+        // First, check it can be made fullscreen window without any effects applied
+        gd.setFullScreenWindow(f);
+        ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
+
+        gd.setFullScreenWindow(null);
+        ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
+
+        // Second, check if it applying any effects doesn't prevent the window
+        // from going into the fullscreen mode
+        if (gd.isWindowTranslucencySupported(PERPIXEL_TRANSPARENT)) {
+            f.setShape(new Ellipse2D.Float(0, 0, f.getWidth(), f.getHeight()));
+        }
+        if (gd.isWindowTranslucencySupported(TRANSLUCENT)) {
+            f.setOpacity(0.5f);
+        }
+        if (gd.isWindowTranslucencySupported(PERPIXEL_TRANSLUCENT)) {
+            f.setBackground(new Color(0, 0, 0, 128));
+        }
+        gd.setFullScreenWindow(f);
+        ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
+
+        // Third, make sure all the effects are unset when entering the fullscreen mode
+        if (f.getShape() != null) {
+            throw new RuntimeException("Test FAILED: fullscreen window shape is not null");
+        }
+        if (Math.abs(f.getOpacity() - 1.0f) > 1e-4) {
+            throw new RuntimeException("Test FAILED: fullscreen window opacity is not 1.0f");
+        }
+        Color bgColor = f.getBackground();
+        if ((bgColor != null) && (bgColor.getAlpha() != 255)) {
+            throw new RuntimeException("Test FAILED: fullscreen window background color is not opaque");
+        }
+
+        f.dispose();
+        System.out.println("Test PASSED");
+    }
+}