Edit C:\Program Files\Java\jdk1.8.0_121\java\net\SocketSecrets.java

/*
 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package java.net;

import java.io.IOException;

class SocketSecrets {

/* accessed by reflection from jdk.net.Sockets */

/* obj must be a Socket or ServerSocket */

private static <T> void setOption(Object obj, SocketOption<T> name, T value) throws IOException {
        SocketImpl impl;

if (obj instanceof Socket) {
            impl = ((Socket)obj).getImpl();
        } else if (obj instanceof ServerSocket) {
            impl = ((ServerSocket)obj).getImpl();
        } else {
            throw new IllegalArgumentException();
        }
        impl.setOption(name, value);
    }

private static <T> T getOption(Object obj, SocketOption<T> name) throws IOException {
        SocketImpl impl;

private static <T> void setOption(DatagramSocket s, SocketOption<T> name, T value) throws IOException {
        s.getImpl().setOption(name, value);
    }

private static <T> T getOption(DatagramSocket s, SocketOption<T> name) throws IOException {
        return s.getImpl().getOption(name);
    }

}

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