--- a/jdk/src/share/classes/java/util/stream/AbstractPipeline.java	Wed Jul 16 08:07:38 2014 -0400
+++ b/jdk/src/share/classes/java/util/stream/AbstractPipeline.java	Wed Jul 16 14:35:48 2014 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -322,6 +322,7 @@
     @Override
     @SuppressWarnings("unchecked")
     public S onClose(Runnable closeHandler) {
+        Objects.requireNonNull(closeHandler);
         Runnable existingHandler = sourceStage.sourceCloseAction;
         sourceStage.sourceCloseAction =
                 (existingHandler == null)
@@ -406,7 +407,7 @@
                         // Clear the short circuit flag for next pipeline stage
                         // This stage encapsulates short-circuiting, the next
                         // stage may not have any short-circuit operations, and
-                        // if so spliterator.forEachRemaining should be be used
+                        // if so spliterator.forEachRemaining should be used
                         // for traversal
                         thisOpFlags = thisOpFlags & ~StreamOpFlag.IS_SHORT_CIRCUIT;
                     }