--- a/src/java.base/share/classes/java/nio/channels/Channels.java	Fri Nov 03 13:03:10 2017 -0400
+++ b/src/java.base/share/classes/java/nio/channels/Channels.java	Fri Nov 03 10:18:27 2017 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2017, 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
@@ -368,6 +368,10 @@
 
         @Override
         public int read(ByteBuffer dst) throws IOException {
+            if (!isOpen()) {
+                throw new ClosedChannelException();
+            }
+
             int len = dst.remaining();
             int totalRead = 0;
             int bytesRead = 0;
@@ -442,6 +446,10 @@
 
         @Override
         public int write(ByteBuffer src) throws IOException {
+            if (!isOpen()) {
+                throw new ClosedChannelException();
+            }
+
             int len = src.remaining();
             int totalWritten = 0;
             synchronized (writeLock) {