diff -r 303c8cca4a31 -r 859aa05172b6 jdk/src/share/classes/sun/util/LocaleServiceProviderPool.java
--- a/jdk/src/share/classes/sun/util/LocaleServiceProviderPool.java	Fri Oct 08 09:50:56 2010 +0900
+++ b/jdk/src/share/classes/sun/util/LocaleServiceProviderPool.java	Tue Oct 12 17:09:14 2010 -0700
@@ -84,7 +84,7 @@
      * static.  This could be non-static later, so that they could have
      * different sets for each locale sensitive services.
      */
-    private static List<Locale> availableJRELocales = null;
+    private static volatile List<Locale> availableJRELocales = null;
 
     /**
      * Provider locales for this locale sensitive service.
@@ -252,12 +252,16 @@
      *
      * @return list of the available JRE locales
      */
-    private synchronized List<Locale> getJRELocales() {
+    private List<Locale> getJRELocales() {
         if (availableJRELocales == null) {
-            Locale[] allLocales = LocaleData.getAvailableLocales();
-            availableJRELocales = new ArrayList<Locale>(allLocales.length);
-            for (Locale locale : allLocales) {
-                availableJRELocales.add(getLookupLocale(locale));
+            synchronized (LocaleServiceProviderPool.class) {
+                if (availableJRELocales == null) {
+                    Locale[] allLocales = LocaleData.getAvailableLocales();
+                    availableJRELocales = new ArrayList<Locale>(allLocales.length);
+                    for (Locale locale : allLocales) {
+                        availableJRELocales.add(getLookupLocale(locale));
+                    }
+                }
             }
         }
         return availableJRELocales;