CDI制作人和注射

我想在我的应用程序中使用一个生产者，但我陷入了困境，我正在尝试注入bean。我得到了着名的WELD-001409错误。请减轻我对cdi制作人的理解。

i want to use a producer in my application but i'm stuck at the point, where i'm trying to inject the bean. im getting the famous WELD-001409 error. please lighten up my understanding of cdi producer.

这是我的界面：

@Named
    public interface MessageSender {
      void sendMessage();
    }

豆子：

public class EmailMessageSender implements MessageSender {

  @Override
  public void sendMessage() {
    System.out.println("Sending email message");
  }

}

和制作人：

@SessionScoped
public class MessageSenderFactory implements Serializable {

    private static final long serialVersionUID = 5269302440619391616L;

    @Produces
    public MessageSender getMessageSender() {
        return new EmailMessageSender();
    }

}

现在我正在注入豆子：

@Inject 
MessageSender messageSender;

当我尝试部署项目时，我收到WELD-001409错误，eclipse也在说有多个注入点。

when i'm trying to deploy the project i get the WELD-001409 error and eclipse also is saying that there are multiple injection points.

它适用于显式命名：

@Inject @Named("messageSender")
MessageSender messageSender;

这个命名是否必要？