1 files changed, 1 insertions, 1 deletions
diff --git a/luni/src/main/java/java/beans/PropertyChangeSupport.java b/luni/src/main/java/java/beans/PropertyChangeSupport.java
index 04f8155..1db12b7 100644
--- a/luni/src/main/java/java/beans/PropertyChangeSupport.java
+++ b/luni/src/main/java/java/beans/PropertyChangeSupport.java
@@ -66,7 +66,7 @@ public class PropertyChangeSupport implements Serializable {
      */
     public PropertyChangeSupport(Object sourceBean) {
         if (sourceBean == null) {
-            throw new NullPointerException();
+            throw new NullPointerException("sourceBean == null");
         }
         this.sourceBean = sourceBean;
     }