spring3 mybatis 环境，dao无法注入，百思不得其解啊。。求大神指点。。。

工程环境是spring3+mybatis，是maven工程。目前的情况是，我有1个主工程，且称作为A工程，另外我抽了一个小工程出来，称之为B工程，现在我需要在A工程调用B工程的方法，我再A工程的类里面调用了B中的某个BO类的方法，在B工程的BO类里面注入dao，结果死活这个dao注入不了。另外，由于是maven工程，我是把B工程打成jar，然后再A中的pom中引入的这个jar。求大神指点一二，到底是咋回事？？？是mybatis的配置有误？还是其他原因呢？？spring的核心文件也配置了相关扫描，注解，以及mybatis的扫描。

错误：

Caused by: 
org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [com.dsp.bg.percore.biz.dao.PermissionMapper] 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)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:924)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:793)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:707)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:478)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:284)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1106)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)