为什么spring注解注入失败？

问题描述

spring版本3.0.5@Componentpublic class IndexFacade {@Autowiredprivate UserService userService;其中 userService访问时是null注解扫描的包<!-- 扫描指定package下所有带有如@controller,@services,@resource,并把所注释的注册为Spring Beans --> <context:component-scan base-package="org.yanb.test" use-default-filters="false"> <context:include-filter type="regex" expression="org.test.main.control.*Control"/><context:include-filter type="regex" expression="org.test.main.facade.*Facade"/> <context:include-filter type="regex" expression="org.test.main.service.*Service"/><context:include-filter type="regex" expression="org.test.main.dao.impl.*Impl"/><!--不扫描<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" /> --> </context:component-scan>奇怪的是control可以注入进来userService@Controllerpublic class IndexControl extends BaseController {@Autowiredprivate IndexFacade indexFacade;@Autowiredprivate UserService userService;求大神帮解决下吧谢谢，我没分了抱歉

解决方案

引用注解扫描的包 <!-- 扫描指定package下所有带有如@controller,@services,@resource,并把所注释的注册为Spring Beans --> <context:component-scan base-package="org.yanb.test" use-default-filters="false"> <context:include-filter type="regex" expression="org.test.main.control.*Control"/> <context:include-filter type="regex" expression="org.test.main.facade.*Facade"/> <context:include-filter type="regex" expression="org.test.main.service.*Service"/> <context:include-filter type="regex" expression="org.test.main.dao.impl.*Impl"/> <!--不扫描<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" /> --> </context:component-scan> <context:component-scan base-package="org.yanb" />
解决方案二：
确认你被注解的userService类使用的名称是否与注解的属性一致
解决方案三：
IndexFacade 里的userService加了setUserService方法吗？