--- old/src/java.base/share/classes/sun/util/locale/provider/DateFormatProviderImpl.java	2014-08-22 11:18:34.831015228 -0700
+++ new/src/java.base/share/classes/sun/util/locale/provider/DateFormatProviderImpl.java	2014-08-22 11:18:34.547011032 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 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
@@ -42,11 +42,10 @@
  */
 public class DateFormatProviderImpl extends DateFormatProvider implements AvailableLanguageTags {
     private final LocaleProviderAdapter.Type type;
-    private final Set<String> langtags;
+    private static Set<String> langtags;
 
-    public DateFormatProviderImpl(LocaleProviderAdapter.Type type, Set<String> langtags) {
+    public DateFormatProviderImpl(LocaleProviderAdapter.Type type) {
         this.type = type;
-        this.langtags = langtags;
     }
 
     /**
@@ -58,12 +57,12 @@
      */
     @Override
     public Locale[] getAvailableLocales() {
-        return LocaleProviderAdapter.toLocaleArray(langtags);
+        return LocaleProviderAdapter.toLocaleArray(getLangTags(type));
     }
 
     @Override
     public boolean isSupportedLocale(Locale locale) {
-        return LocaleProviderAdapter.isSupportedLocale(locale, type, langtags);
+        return LocaleProviderAdapter.isSupportedLocale(locale, type, getLangTags(type));
     }
 
     /**
@@ -164,6 +163,17 @@
 
     @Override
     public Set<String> getAvailableLanguageTags() {
+        return getLangTags(type);
+    }
+
+    /**
+     * Available language tags for FormatData resources. Shared with other "format"
+     * provider implementations.
+     * */
+    static Set<String> getLangTags(LocaleProviderAdapter.Type t) {
+        if (langtags == null) {
+            langtags = ((JRELocaleProviderAdapter)LocaleProviderAdapter.forType(t)).getLanguageTagSet("FormatData");
+        }
         return langtags;
     }
 }