@Slf4j
@Component
@ChannelHandler.Sharable
public class NettyWsHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
    private static MessageManager messageManager;

    private static ConnectionManager connectionManager;

    private static RedisUtil redisUtil;

    private static ServerConfig serverConfig;

    @Autowired
    private void setter(MessageManager messageManager, ConnectionManager connectionManager,
                        RedisUtil redisUtil, ServerConfig serverConfig) {
        NettyWsHandler.messageManager = messageManager;
        NettyWsHandler.connectionManager = connectionManager;
        NettyWsHandler.redisUtil = redisUtil;
        NettyWsHandler.serverConfig = serverConfig;
    }
  ...