src/java.base/share/classes/java/io/BufferedOutputStream.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1994, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1994, 2019, 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -67,10 +67,13 @@
      * @param   size   the buffer size.
      * @exception IllegalArgumentException if size <= 0.
      */
     public BufferedOutputStream(OutputStream out, int size) {
         super(out);
+        if (out == null) {
+            throw new NullPointerException();
+        } 
         if (size <= 0) {
             throw new IllegalArgumentException("Buffer size <= 0");
         }
         buf = new byte[size];
     }