--- old/src/java.base/share/classes/sun/util/locale/provider/CollatorProviderImpl.java	2014-08-22 11:18:31.708969091 -0700
+++ new/src/java.base/share/classes/sun/util/locale/provider/CollatorProviderImpl.java	2014-08-22 11:18:31.406964629 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2013, 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
@@ -54,11 +54,10 @@
  */
 public class CollatorProviderImpl extends CollatorProvider implements AvailableLanguageTags {
     private final LocaleProviderAdapter.Type type;
-    private final Set<String> langtags;
+    private Set<String> langtags;
 
-    public CollatorProviderImpl(LocaleProviderAdapter.Type type, Set<String> langtags) {
+    public CollatorProviderImpl(LocaleProviderAdapter.Type type) {
         this.type = type;
-        this.langtags = langtags;
     }
 
     /**
@@ -70,12 +69,12 @@
      */
     @Override
     public Locale[] getAvailableLocales() {
-        return LocaleProviderAdapter.toLocaleArray(langtags);
+        return LocaleProviderAdapter.toLocaleArray(getLangTags());
     }
 
     @Override
     public boolean isSupportedLocale(Locale locale) {
-        return LocaleProviderAdapter.isSupportedLocale(locale, type, langtags);
+        return LocaleProviderAdapter.isSupportedLocale(locale, type, getLangTags());
     }
 
     /**
@@ -126,6 +125,13 @@
 
     @Override
     public Set<String> getAvailableLanguageTags() {
+        return getLangTags();
+    }
+
+    private Set<String> getLangTags() {
+        if (langtags == null) {
+            langtags = ((JRELocaleProviderAdapter)LocaleProviderAdapter.forType(type)).getLanguageTagSet("CollationData");
+        }
         return langtags;
     }
 }