MyBatis遇到org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:

Error querying database. Cause: java.lang.UnsupportedOperationException

The error may exist in file [F:\IDEA_Project\aidp\target\classes\com.hikvision.aidp.mapper\PlanInfoMapper.xml]

The error may involve com.hikvision.aidp.mapper.PlanInfoMapper.getPlan

The error occurred while handling results

SQL: select plan_id, plan_name from plan_info

Cause: java.lang.UnsupportedOperationException

解决方法

出错：

  <select id="getPlan" resultType="java.util.List">
        select plan_id, plan_name from plan_info
    </select>

出错原因：大致意思就是设置的参数有问题。原因就在于mapper.xml的resultType代表的是List中的元素类型，而不应该是List本身，所以修改mapper.xml文件为：

修改后：

  <select id="getPlan" resultType="com.hikvision.aidp.entity.PlanInfo">
        select plan_id, plan_name from plan_info
    </select>