解决方案：
原来的文件：

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="mapperLocations" 		value="classpath:com/leeon/mapping/*.xml"/>
</bean>

修改classpath 为 classpath*

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="mapperLocations" value="classpath*:com/leeon/mapping/*.xml"/>