--- a/src/java.base/share/classes/sun/nio/ch/DatagramSocketAdaptor.java	Thu Feb 08 11:44:21 2018 +0800
+++ b/src/java.base/share/classes/sun/nio/ch/DatagramSocketAdaptor.java	Thu Feb 08 10:55:21 2018 +0000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2018, 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
@@ -25,10 +25,22 @@
 
 package sun.nio.ch;
 
-import java.io.*;
-import java.net.*;
-import java.nio.*;
-import java.nio.channels.*;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.DatagramSocketImpl;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.NetworkInterface;
+import java.net.SocketAddress;
+import java.net.SocketException;
+import java.net.SocketOption;
+import java.net.SocketTimeoutException;
+import java.net.StandardSocketOptions;
+import java.nio.ByteBuffer;
+import java.nio.channels.ClosedChannelException;
+import java.nio.channels.DatagramChannel;
+import java.nio.channels.IllegalBlockingModeException;
 
 
 // Make a datagram-socket channel look like a datagram socket.
@@ -178,7 +190,6 @@
 
         dc.configureBlocking(false);
         try {
-            int n;
             SocketAddress sender;
             if ((sender = dc.receive(bb)) != null)
                 return sender;
@@ -188,19 +199,18 @@
                      throw new ClosedChannelException();
                 long st = System.currentTimeMillis();
                 int result = dc.poll(Net.POLLIN, to);
-                if (result > 0 &&
-                        ((result & Net.POLLIN) != 0)) {
+                if (result > 0 && ((result & Net.POLLIN) != 0)) {
                     if ((sender = dc.receive(bb)) != null)
                         return sender;
                 }
                 to -= System.currentTimeMillis() - st;
                 if (to <= 0)
                     throw new SocketTimeoutException();
-
             }
         } finally {
-            if (dc.isOpen())
+            try {
                 dc.configureBlocking(true);
+            } catch (ClosedChannelException e) { }
         }
     }