--- a/src/java.base/share/classes/sun/util/locale/provider/JRELocaleProviderAdapter.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/sun/util/locale/provider/JRELocaleProviderAdapter.java	Thu Dec 13 15:31:05 2018 +0100
@@ -503,7 +503,7 @@
          */
         String supportedLocaleString = createSupportedLocaleString("AvailableLocales");
 
-        if (supportedLocaleString.length() == 0) {
+        if (supportedLocaleString.isEmpty()) {
             throw new InternalError("No available locales for JRE");
         }