1 files changed, 1 insertions, 1 deletions
diff --git a/luni/src/main/java/java/text/MessageFormat.java b/luni/src/main/java/java/text/MessageFormat.java
index a98e4fd..2ab78db 100644
--- a/luni/src/main/java/java/text/MessageFormat.java
+++ b/luni/src/main/java/java/text/MessageFormat.java
@@ -506,7 +506,7 @@ public class MessageFormat extends Format {
     @Override
     public AttributedCharacterIterator formatToCharacterIterator(Object object) {
         if (object == null) {
-            throw new NullPointerException();
+            throw new NullPointerException("object == null");
         }
 
         StringBuffer buffer = new StringBuffer();