Class field in Netty ChannelInboundHandler could not autowired

Question

I try to autowire some service class in channelInboundhandler class field.
but when handler use repository field it always null.

Here is my Netty Configuration

my.netty:
  server:
    bind: 9000

@SpringBootApplication
public class NettyApplication {

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

  @Bean
  NettyServerConfig serverConfig(@Autowired ServerHandler serverHandler) {
    return NettyServerConfig.builder()
        .propertiesPrefix("my.netty.server")
        .channelInitializer(pipelineOf(loggingChannelHandler(), serverHandler))
        .build();
  }

  @Bean
  ChannelHandler loggingChannelHandler() {
    return new LoggingHandler(INFO);
  }
}

And channelinboundhandler, Service(Repository)

@Slf4j
@Component
@Sharable
public class ServerHandler extends ChannelInboundHandlerAdapter {

  @Autowired ServerRepository repository; // always null

  @Override
  public void channelRead(ChannelHandlerContext ctx, Object object) throws Exception {
    log.info("ServerHandler.channelRead()");
    String data = repository.findOne();
    log.info("data={}", data);
    ctx.writeAndFlush(object);
  }
}

@Repository
public class ServerRepository {

  public String findOne() {
    sleep(1000); // data-access time
    return "data";
  }

  private void sleep(int millis) {
    try {
      Thread.sleep(millis);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }
}

Is There any Problem?