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

*** 58,68 ****
          return LocaleProviderAdapter.toLocaleArray(langtags);
      }
  
      @Override
      public boolean isSupportedLocale(Locale locale) {
!         return LocaleProviderAdapter.isSupportedLocale(locale, type, langtags);
      }
  
      /**
       * Returns a new <code>DateFormatSymbols</code> instance for the
       * specified locale.
--- 58,68 ----
          return LocaleProviderAdapter.toLocaleArray(langtags);
      }
  
      @Override
      public boolean isSupportedLocale(Locale locale) {
!         return LocaleProviderAdapter.forType(type).isSupportedProviderLocale(locale, langtags);
      }
  
      /**
       * Returns a new <code>DateFormatSymbols</code> instance for the
       * specified locale.