春3 IOC注释

我有以下的包层次
-org.bmark
--dao
---实现
---接口
--services
--- implementation
--- interfaces
这是我的web.xml中春3 IOC注释

<context-param> 
    <param-name>contextConfigLocation</param-name> 
    <param-value>/WEB-INF/spring/ApplicationContext.xml</param-value> 
</context-param> 

<!-- Creates the Spring Container shared by all Servlets and Filters --> 
<listener> 
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
</listener> 

<listener> 
     <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> 
</listener>

这是我的applicationContext.xml

<context:annotation-config/> 
<context:component-scan base-package="org.bmark.dao"/> 
<context:component-scan base-package="org.bmark.services"/>

的一部分，我有一个的UserDAO和ContentTypeDAO（两者都实现）。我也有一个UserService和一个ContentTypeService（都有实现）。 services类具有@Service注释。
UserDAO是@Autowired到UserServiceImpl的实现中，并且一切正常。问题是，ContentTypeDAO也@Autowired到ContentTypeServiceImpl但是当我启动服务器我得到这个异常：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'contentTypeServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.bmark.dao.intefaces.ContentTypeDAO org.bmark.services.implementations.ContentTypeServiceImpl.contentTypeDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.bmark.dao.intefaces.ContentTypeDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}<br/> 
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.bmark.dao.intefaces.ContentTypeDAO org.bmark.services.implementations.ContentTypeServiceImpl.contentTypeDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.bmark.dao.intefaces.ContentTypeDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}<br/> 
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.bmark.dao.intefaces.ContentTypeDAO] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

为什么我让我的ContentTypeDAO这个例外，而不是与我的UserDAO得到它？我该如何解决这个问题？

来源

2012-07-20 Mr T.

尝试

<context:component-scan base-package="org.bmark.dao, org.bmark.services"/>

更换

<context:component-scan base-package="org.bmark.dao"/> 
<context:component-scan base-package="org.bmark.services"/>

我不能完全肯定，如果上下文支持多个component-scan定义，或者也许一个覆盖另一个。

来源

2012-07-20 17:01:37

春3 IOC注释

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