--- old/src/java.base/share/classes/sun/net/NetworkServer.java	2017-12-22 15:05:52.000000000 -0800
+++ new/src/java.base/share/classes/sun/net/NetworkServer.java	2017-12-22 15:05:51.000000000 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1995, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1995, 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
@@ -27,6 +27,7 @@
 import java.io.*;
 import java.net.Socket;
 import java.net.ServerSocket;
+import jdk.internal.io.IOSupport;
 
 /**
  * This is the base class for network servers.  To define a new type
@@ -117,13 +118,9 @@
         server just echoes it's input. It is invoked in it's own private
         thread. */
     public void serviceRequest() throws IOException {
-        byte buf[] = new byte[300];
-        int n;
         clientOutput.print("Echo server " + getClass().getName() + "\n");
         clientOutput.flush();
-        while ((n = clientInput.read(buf, 0, buf.length)) >= 0) {
-            clientOutput.write(buf, 0, n);
-        }
+        IOSupport.copy(clientInput, clientOutput, 300);
     }
 
     public static void main(String argv[]) {