src/share/classes/com/sun/java/swing/plaf/windows/WindowsInternalFrameTitlePane.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2014, Oracle and/or its affiliates. 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.  Oracle designates this

@@ -84,18 +84,19 @@
             if (d != null && d.width != 0 && d.height != 0) {
                 buttonWidth = (int) ((float) buttonWidth * d.width / d.height);
             }
         } else {
             buttonWidth += 2;
-            selectedTitleGradientColor =
-                    UIManager.getColor("InternalFrame.activeTitleGradient");
-            notSelectedTitleGradientColor =
-                    UIManager.getColor("InternalFrame.inactiveTitleGradient");
             Color activeBorderColor =
                     UIManager.getColor("InternalFrame.activeBorderColor");
             setBorder(BorderFactory.createLineBorder(activeBorderColor, 1));
         }
+        // JDK-8039383: initialize these colors because getXP() may return null when theme is changed
+        selectedTitleGradientColor =
+                UIManager.getColor("InternalFrame.activeTitleGradient");
+        notSelectedTitleGradientColor =
+                UIManager.getColor("InternalFrame.inactiveTitleGradient");
     }
 
     protected void uninstallListeners() {
         // Get around protected method in superclass
         super.uninstallListeners();