ServerBootstrap b = new ServerBootstrap(); // (2)
    b.group(bossGroup, workerGroup)
        .channel(NioServerSocketChannel.class) // (3)
        .childHandler(new ChannelInitializer<SocketChannel>() { // (4)
          @Override
          public void initChannel(SocketChannel ch) throws Exception {
            ch.pipeline().addLast(
                new LoggingHandler("Syslog", LogLevel.INFO),
                new DelimiterBasedFrameDecoder(2000, true, Delimiters.lineDelimiter()),
                new TCPSyslogMessageDecoder(),
                new SyslogMessageDecoder(),
                new PaloAltoMessageDecoder(),
                new MyPaloAltoMessageHandler()
            );
          }
        })
        .option(ChannelOption.SO_BACKLOG, 128)          // (5)
        .childOption(ChannelOption.SO_KEEPALIVE, true); // (6)

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.util.ArrayList;
import java.util.List;

class MyPaloAltoMessageHandler extends SimpleChannelInboundHandler<TrafficLogMessage> {
  

  @Override
  protected void channelRead0(ChannelHandlerContext channelHandlerContext, TrafficLogMessage message) throws Exception {
  
  }
}