/*

 * Copyright (c) 2002, 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.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 4712609

 * @summary Socket(String host, int port) throws NullPointerException if host is null

 */

import java.net.*;

import java.io.IOException;

public class NullHost {

    class Server extends Thread {

        private ServerSocket svr;

        public Server() throws IOException {

            svr = new ServerSocket();

            // The client side calls Socket((String) null, ...) which

            // resolves to InetAddress.getByName((String)null) which in

            // turns will resolve to the loopback address

            svr.bind(new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));

        }

        public int getPort() {

            return svr.getLocalPort();

        }

        volatile boolean done;

        public void shutdown() {

            try {

                done = true;

                svr.close();

            } catch (IOException e) {

            }

        }

        public void run() {

            Socket s;

            try {

                while (!done) {

                    s = svr.accept();

                    s.close();

                }

            } catch (IOException e) {

                if (!done) e.printStackTrace();

            }

        }

    }

    public static void main(String[] args) throws IOException {

        NullHost n = new NullHost();

    }

    public NullHost () throws IOException {

        Server s = new Server();

        int port = s.getPort();

        s.start();

        try {

            try (var sock = new Socket((String)null, port)) {}

            try (var sock = new Socket((String)null, port, true)) {}

            try (var sock = new Socket((String)null, port, null, 0)) {}

        } catch (NullPointerException e) {

            throw new RuntimeException("Got a NPE");

        } finally {

            s.shutdown();

        }

    }

}