class ChatServer {
  public static void main(String[] args) throws InterruptedException {
      EventLoopGroup bossGroup = new NioEventLoopGroup(1);
      EventLoopGroup workerGroup = new NioEventLoopGroup();

      ServerBootstrap serverBootstrap = new ServerBootstrap();
      serverBootstrap.group(bossGroup, workerGroup)
        .channel(NioServerSocketChannel.class)
        .childHandler(new ChannelInitializer<SocketChannel>() {
          @Override
          public void initChannel(SocketChannel ch) {
            ch.pipeline().addLast(new DelimiterBasedFrameDecoder(MAX_FRAME_LENGTH, DELIMITER));
            ch.pipeline().addLast(new StringDecoder());
            ch.pipeline().addLast(new StringEncoder());
            ch.pipeline().addLast(new ChatServerHandler());
          }
        });

      ChannelFuture channelFuture = serverBootstrap.bind(LISTEN_PORT).sync();
      System.out.println("ChatServer started.");    
      channelFuture.channel().closeFuture().await();
  }
}

@SpringBootApplication
public class SpringBootdemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringBootdemoApplication.class, args);
    }
}

public final class System {
   /**
     * Returns the current time in milliseconds.  Note that
     * while the unit of time of the return value is a millisecond,
     * the granularity of the value depends on the underlying
     * operating system and may be larger.  For example, many
     * operating systems measure time in units of tens of
     * milliseconds.
     *
     * <p> See the description of the class <code>Date</code> for
     * a discussion of slight discrepancies that may arise between
     * "computer time" and coordinated universal time (UTC).
     *
     * @return  the difference, measured in milliseconds, between
     *          the current time and midnight, January 1, 1970 UTC.
     * @see     java.util.Date
     */
    public static native long currentTimeMillis();
}