为什么CDI无法使用@Inject（在@Singleton内部）和@Named

Question

以下是我正在使用@Named的Dao层实现

@Named("customerAgreementDao")
public class CustomerAgreementDaoImpl extends GenericDaoImpl<CustomerAgreement, Long> implements CustomerAgreementDao {

以下是我正在使用@Inject的调度程序类

@Startup
@Singleton
@AccessTimeout(value = 5, unit = TimeUnit.MINUTES)
public class Poller {

    @Inject
    public CustomerAgreementDao customerAgreementDao;

    CustomerAgreementFetcher customerAgreementFetcher = new CustomerAgreementFetcher(customerAgreementDao);

谁能说出为什么它不能注入豆子？