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

*** 1,7 ****
  /*
!  * Copyright (c) 1994, 2015, 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
--- 1,7 ----
  /*
!  * 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
*** 67,76 ****
--- 67,79 ----
       * @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];
      }