src/java.base/share/classes/sun/util/locale/provider/NumberFormatProviderImpl.java

@@ -84,11 +84,11 @@
         return LocaleProviderAdapter.forType(type).getAvailableLocales();
     }
 
     @Override
     public boolean isSupportedLocale(Locale locale) {
-        return LocaleProviderAdapter.isSupportedLocale(locale, type, langtags);
+        return LocaleProviderAdapter.forType(type).isSupportedProviderLocale(locale, langtags);
     }
 
     /**
      * Returns a new <code>NumberFormat</code> instance which formats
      * monetary values for the specified locale.