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Zodiac SDK NIO2(New Non-Blocking IO)
There is a newer version: 1.6.8
package org.zodiac.sdk.nio.http.server;

import org.zodiac.sdk.cli.*;
import org.zodiac.sdk.nio.http.ApplicationProtocol;
import org.zodiac.sdk.nio.http.NioHttpConstants;
import org.zodiac.sdk.nio.http.TransportProtocol;

import io.vavr.control.Either;
import io.vavr.control.Try;

@Command(name = NioHttpConstants.HTTPFS, description = "httpfs is a simple file server.")
public class ServerEntryPoint {

    @Flag(
        name = "verbose",
        alias = {"--verbose", "-v"},
        required = false,
        description = "Prints debugging messages.")
    boolean verbose;

    @Flag(
        name = "udp",
        alias = {"--udp"},
        required = false,
        description = "Use a Selective Repeat over UDP transport protocol implementation.")
    boolean udp;

    @Option(
        name = "port",
        alias = {"--port", "-p"},
        argument = @Argument(
            name = "port",
            format = "number",
            regex = "(^\\d+$)",
            description = ""),
        description = "Specifies the port number that the server will listen and serve at (default is 8080).")
    int port;

    @Option(
        name = "directory",
        alias = {"--dir", "-d"},
        argument = @Argument(name = "directory",
            format = "/path/to/directory",
            regex = "(.*)",
            description = "Path to the directory"),
        description = "Specifies the directory that the server will use to read/write requested files (default is the current directory when launching the application).")
    String directory;

    public ServerEntryPoint() {
        super();
    }

    public ServerEntryPoint(boolean verbose, boolean udp, int port, String directory) {
        super();
        this.verbose = verbose;
        this.udp = udp;
        this.port = port;
        this.directory = directory;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((directory == null) ? 0 : directory.hashCode());
        result = prime * result + port;
        result = prime * result + (udp ? 1231 : 1237);
        result = prime * result + (verbose ? 1231 : 1237);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        ServerEntryPoint other = (ServerEntryPoint)obj;
        if (directory == null) {
            if (other.directory != null)
                return false;
        } else if (!directory.equals(other.directory))
            return false;
        if (port != other.port)
            return false;
        if (udp != other.udp)
            return false;
        if (verbose != other.verbose)
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "ServerEntryPoint [verbose=" + verbose + ", udp=" + udp + ", port=" + port + ", directory=" + directory + "]";
    }

    public static void entryPoint(final String[] args) {
        final Parser parser = new Parser<>(ServerEntryPoint.class);
        final Try> result = parser.parse(String.join(" ", args));

        result
            .onSuccess(success -> {
                if (success.isLeft()) {
                    System.out.println(success.getLeft());
                }

                if (success.isRight()) {
                    exec(success.get());
                }
            })
            .onFailure(failure -> {
                System.err.println(failure.getMessage());
                System.err.println(parser.help());
                System.exit(1);
            });
    }

    static void exec(final ServerEntryPoint ep) {
        final Server.Configuration configuration = new Server.Configuration(
            TransportProtocol.Type.of(ep.udp ? "UDP" : "TCP"),
            ApplicationProtocol.Type.of("FS"),
            ep.port,
            ep.verbose,
            ep.directory);
        new Server(configuration).run();
    }

}