Mapper XML 中报错：Caused by: java.lang.ClassNotFoundException: Cannot find class : XXX 解决方案_java mapper cannot not find class

原xml:

 <resultMap id="spuItemAttrGroupVo" type="com.atguigu.gulimall.product.vo.SpuItemAttrGroupVo">
        <result property="groupName" column="attr_group_name"></result>
        <collection property="attrs" ofType="com.atguigu.gulimall.product.vo.SpuBaseAttrVo">
            <result column="attr_name" property="attrName"></result>
            <result column="attr_value" property="attrValues"></result>
        </collection>
    </resultMap>
    <select id="getAttrGroupWithAttrsBySpuId"
            resultType="spuItemAttrGroupVo">
        SELECT attr_name ,attr_value  ,pag.attr_group_name
        FROM pms_product_attr_value ppav
                 LEFT JOIN pms_attr_attrgroup_relation  paar ON paar.attr_id = ppav.attr_id
                 LEFT JOIN pms_attr_group pag ON pag.attr_group_id= paar.attr_group_id and pag.catelog_id= #{catalogId}
        WHERE ppav.spu_id = #{spuId};
    </select>

后面发现 把 resultMap 写成了 resultType ，修改后：程序运行成功

 <resultMap id="spuItemAttrGroupVo" type="com.atguigu.gulimall.product.vo.SpuItemAttrGroupVo">
        <result property="groupName" column="attr_group_name"></result>
        <collection property="attrs" ofType="com.atguigu.gulimall.product.vo.SpuBaseAttrVo">
            <result column="attr_name" property="attrName"></result>
            <result column="attr_value" property="attrValues"></result>
        </collection>
    </resultMap>
    <select id="getAttrGroupWithAttrsBySpuId"
            resultMap="spuItemAttrGroupVo">
        SELECT attr_name ,attr_value  ,pag.attr_group_name
        FROM pms_product_attr_value ppav
                 LEFT JOIN pms_attr_attrgroup_relation  paar ON paar.attr_id = ppav.attr_id
                 LEFT JOIN pms_attr_group pag ON pag.attr_group_id= paar.attr_group_id and pag.catelog_id= #{catalogId}
        WHERE ppav.spu_id = #{spuId};
    </select>