java - 带有限定符@Default的ZZZZ类型的依赖关系不令人满意

我有如下所示的豆子。

@Singleton
@DependsOn("DefaultEmailService")
public class CustomerService implements UserHandlingService {

    private DefaultEmailService mailService;

    @Inject
    public CustomerService(DefaultEmailService mailService) {
        this.mailService = mailService;
    }
}


@Singleton
@Startup
public class DefaultEmailService implements EmailService {

    public DefaultEmailService() {
    }
}

我收到类似的错误

Caused by: org.jboss.weld.exceptions.DeploymentException: WELD-001408: Unsatisfied dependencies for type DefaultEmailService with qualifiers @Default
  at injection point [BackedAnnotatedParameter] Parameter 1 of [BackedAnnotatedConstructor] @Inject public com.project.service.CustomerService(DefaultEmailService)
  at com.project.service.CustomerService.<init>(CustomerService.java:0)

我做错了什么吗？

最佳答案

问题是@Singleton批注，它来自javax.ejb而不是javax.inject。使用ejb一个并定义接口，您的bean在CDI上下文中注册为接口，而不是实现，请更改您的代码:

@Inject
public CustomerService(EmailService mailService) {
    this.mailService = (DefaultEmailService) mailService;
}