spring3定时任务中注入service报错？Injection of autowired dependencies failed;

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spring3定时任务中注入service报错？Injection of autowired dependencies failed;0

想用spring3的定时器做一个功能：类似每天某个时间去检查见天过期的任务。。。
发现启动就会报错,不知要如何解决？恳请大家指点

代码

@Autowired
	private StudyPlanService studyPlanService;
	
	@Scheduled(cron="0 30 1 * * ?")
	public void checkExpiredPlan(){
		logger.debug("检查今天过期的……");
		.....................................
		}
	}

配置

<task:annotation-driven/> 
	<context:annotation-config/>
    <bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
    <context:component-scan base-package="com.gt.edu.listener.springtask"/>

ERROR: org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'planStatusCheck': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.gt.edu.service.StudyPlanService com.gt.edu.listener.springtask.PlanStatusCheck.studyPlanService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.gt.edu.service.StudyPlanService] 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)}
..................
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.gt.edu.service.StudyPlanService com.gt.edu.listener.springtask.PlanStatusCheck.studyPlanService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.gt.edu.service.StudyPlanService] 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)}
......................
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.gt.edu.service.StudyPlanService] 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)}