--- a/src/share/classes/java/awt/GraphicsEnvironment.java	Wed Dec 24 09:53:52 2008 -0800
+++ b/src/share/classes/java/awt/GraphicsEnvironment.java	Wed Dec 24 09:57:48 2008 -0800
@@ -356,6 +356,9 @@
      * @since 1.5
      */
     public void preferLocaleFonts() {
+        if (!(this instanceof SunGraphicsEnvironment)) {
+            return;
+        }
         sun.font.FontManager.preferLocaleFonts();
     }
 
@@ -376,6 +379,9 @@
      * @since 1.5
      */
     public void preferProportionalFonts() {
+        if (!(this instanceof SunGraphicsEnvironment)) {
+            return;
+        }
         sun.font.FontManager.preferProportionalFonts();
     }
 

--- a/src/share/classes/sun/awt/FontConfiguration.java	Wed Dec 24 09:53:52 2008 -0800
+++ b/src/share/classes/sun/awt/FontConfiguration.java	Wed Dec 24 09:57:48 2008 -0800
@@ -98,7 +98,7 @@
         if (!inited) {
             this.preferLocaleFonts = false;
             this.preferPropFonts = false;
-            fontConfig = this;      /* static initialization */
+            setFontConfiguration();
             readFontConfigFile(fontConfigFile);
             initFontConfig();
             inited = true;
@@ -1244,6 +1244,10 @@
         return fontConfig;
     }
 
+    protected void setFontConfiguration() {
+        fontConfig = this;      /* static initialization */
+    }
+
     //////////////////////////////////////////////////////////////////////
     // FontConfig data tables and the index constants in binary file    //
     //////////////////////////////////////////////////////////////////////

--- a/src/solaris/classes/sun/font/FcFontConfiguration.java	Wed Dec 24 09:53:52 2008 -0800
+++ b/src/solaris/classes/sun/font/FcFontConfiguration.java	Wed Dec 24 09:57:48 2008 -0800
@@ -15,7 +15,7 @@
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
- * along with this work; if not, write to the Free Software Foundation,
+ * 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,
@@ -87,6 +87,7 @@
             return true;
         }
 
+        setFontConfiguration();
         readFcInfo();
         if (fcCompFonts == null) {
             fcCompFonts = FontManager.loadFontConfig();

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/java/awt/GraphicsEnvironment/PreferLocaleFonts.java	Wed Dec 24 09:57:48 2008 -0800
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2008 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 6752638
+ * @summary Test no NPE calling preferLocaleFonts() on custom GE.
+ * @run main PreferLocaleFonts
+ */
+
+import java.util.*;
+import java.awt.*;
+import java.awt.image.*;
+
+public class PreferLocaleFonts extends GraphicsEnvironment {
+
+    public static void main(String args[]) {
+(new PreferLocaleFonts()).preferLocaleFonts();
+    }
+    public PreferLocaleFonts() {
+        super();
+    }
+    public Graphics2D createGraphics(BufferedImage image) {
+        return null;
+    }
+    public String[] getAvailableFontFamilyNames(Locale locale) {
+        return null;
+    }
+    public String[] getAvailableFontFamilyNames() {
+        return null;
+    }
+    public Font[] getAllFonts() {
+        return null;
+    }
+    public GraphicsDevice getDefaultScreenDevice() throws HeadlessException {
+        return null;
+    }
+    public GraphicsDevice[] getScreenDevices() throws HeadlessException {
+        return null;
+    }
+}
+