diff -r 11679a57a895 -r 7b3c3c327cf0 rt/emul/compact/src/main/java/java/util/Locale.java
--- a/rt/emul/compact/src/main/java/java/util/Locale.java	Mon Feb 23 09:00:13 2015 +0100
+++ b/rt/emul/compact/src/main/java/java/util/Locale.java	Thu Feb 26 19:19:59 2015 +0100
@@ -638,7 +638,7 @@
         String lang = language();
         if (lang != null) {
             String[] arr = lang.split("-");
-            return new Locale(arr[0], arr[1]);
+            return new Locale(arr[0], arr.length == 1 ? "" : arr[1]);
         }
         return Locale.US;
     }