spring mvc 注入dao失败，怎么办？

Question

<!-- 扫描文件（自动将dao层注入） -
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"
p:dataSource-ref="dataSource" p:configLocation="classpath:mybatis-config.xml" p:mapperLocations="classpath:mapper/*Mapper.xml" />
<!-- configLocation为mybatis配置文件； mapperLocations为所有mapper映射文件，若mybatis配置文件中已经添加mapper映射文件，mapperLocations无需再配，否则报错。 
p:mapperLocations="classpath:mapper/*Mapper.xml"
-->