No qualifying bean of type 'org.apache.ibatis.session.SqlSession' available

1、可能是SqlSessionFactoryBean配置错误

<bean id="mySqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">  
        <property name="dataSource" ref="dataSource" />  
        <!-- 自动扫描mapping.xml文件 -->  
        <property name="mapperLocations" value="classpath:com/ssm/mapper/*.xml"></property>  
    </bean>

2、可能UserDao注入SqlSessionFactoryBean错误

<!-- DAO接口所在包名，Spring会自动查找其下的类 -->  
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">  
        <property name="basePackage" value="com.ssm.dao" />
        <property name="sqlSessionFactoryBeanName" value="mySqlSessionFactory"></property>
    </bean>