Netty simple TCP server

package pl.org.moki;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class Application {

    private static final Logger logger = LogManager.getLogger();

    public static void main(String[] args) throws Exception {
        int port = 80;
        logger.info("Server starting");

        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            socketChannel.pipeline().addLast(new StringEncoder());
                            socketChannel.pipeline().addLast(new StringDecoder());
                            socketChannel.pipeline().addLast(new ProxyChannelHandler());
                        }
                    })
                    .childOption(ChannelOption.SO_KEEPALIVE, true);

            ChannelFuture f = b.bind(port).sync();
            if (f.isSuccess())
                logger.info("Server started successfully");
            f.channel().closeFuture().sync();

        } finally {
            logger.info("Server closing");

            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();

            logger.info("Server closed successfully");
        }
    }

}

package pl.org.moki;

import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;

public class ProxyChannelHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        System.out.println(ctx.channel().remoteAddress() + ": Channel Active");
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object o) throws Exception {
        String s = (String) o;
        System.out.println(ctx.channel().remoteAddress() + ": " + s);
        ctx.channel().writeAndFlush("Thanks\n");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        System.out.println(ctx.channel().remoteAddress() + ": Channel Inactive");
    }

}