spring注入一定得接口吗？

码农戏码

于 2009-08-15 00:55:45 发布

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分类专栏： Spring 文章标签： Spring Bean Java

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本文讨论了一个关于Spring框架中依赖注入的问题。作者尝试在一个类中使用@Autowired注解来注入AskQuestionServiceImp服务，但是遇到了错误。错误信息显示无法实例化Action，并且在尝试自动装配字段时发生失败。

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spring注入一定得接口吗？

今日在类中写上


@Autowired
private AskQuestionServiceImp  service;

竟然报错。

Unable to instantiate Action, org.java1995.askchannel.admin.action.QuestionAction,  defined for 'question' in namespace '/admin'Error creating bean with name 'org.java1995.askchannel.admin.action.QuestionAction': Autowiring of fields failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.java1995.askchannel.admin.service.imp.QuestionAdminServiceImp org.java1995.askchannel.admin.action.QuestionAction.questionAdminService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No unique bean of type [org.java1995.askchannel.admin.service.imp.QuestionAdminServiceImp] is defined: Unsatisfied dependency of type [class org.java1995.askchannel.admin.service.imp.QuestionAdminServiceImp]: expected at least 1 matching bean

很是奇怪了。