--- a/src/java.base/share/classes/sun/util/locale/LocaleUtils.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/sun/util/locale/LocaleUtils.java	Thu Dec 13 15:31:05 2018 +0100
@@ -207,7 +207,7 @@
     }
 
     static boolean isEmpty(String str) {
-        return str == null || str.length() == 0;
+        return str == null || str.isEmpty();
     }
 
     static boolean isEmpty(Set<?> set) {