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

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1994, 2017, 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

@@ -65,10 +65,14 @@
      *                the field {@code this.out} for later use, or
      *                <code>null</code> if this instance is to be
      *                created without an underlying stream.
      */
     public FilterOutputStream(OutputStream out) {
+        if (out == null) {
+            throw new NullPointerException();
+        }
+
         this.out = out;
     }
 
     /**
      * Writes the specified <code>byte</code> to this output stream.
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