springboot @Autowired service 注入为空

@Component
@Slf4j
public class FMSGCallBack_V30 implements HCNetSDK.FMSGCallBack {
    
    @Autowired
    protected SDKService sdkService;
    private static FMSGCallBack_V30  fmsgCallBack_v30 ;
    @PostConstruct //通过@PostConstruct实现初始化bean之前进行的操作
    public void init() {
        fmsgCallBack_v30 = this;
        fmsgCallBack_v30.sdkService = this.sdkService;
        // 初使化时将已静态化的service实例化
    }