diff -r ad2ca2a4ab5e -r 0e5899f09dab src/share/classes/com/sun/tools/javac/api/MultiTaskListener.java
--- a/src/share/classes/com/sun/tools/javac/api/MultiTaskListener.java	Tue Sep 25 11:56:46 2012 +0100
+++ b/src/share/classes/com/sun/tools/javac/api/MultiTaskListener.java	Tue Sep 25 13:06:58 2012 -0700
@@ -79,10 +79,8 @@
             if (ccw.unwrap(l) == listener)
                 throw new IllegalStateException();
         }
-        TaskListener[] newListeners = new TaskListener[listeners.length + 1];
-        System.arraycopy(listeners, 0, newListeners, 0, listeners.length);
-        newListeners[newListeners.length - 1] = ccw.wrap(listener);
-        listeners = newListeners;
+        listeners = Arrays.copyOf(listeners, listeners.length + 1);
+        listeners[listeners.length - 1] = ccw.wrap(listener);
     }
 
     public void remove(TaskListener listener) {