org.apache.ibatis.executor.ExecutorException: There was no TypeHandler found for

对于org.apache.ibatis.executor.ExecutorException: There was no TypeHandler found for parameter...这个异常，是由于javaType和jdbcType的类型不匹配造成的。

<insert id="add" parameterType="Message">
        insert into t_message(id,content,createtime,t_student_id,t_class_id)
        values(#{id},#{content},#{createTime},#{student},#{class})
</insert>

我的数据库里，t_student_id和t_class_id是varchar类型，Message里面有student和class对象，所以直接按上面方案配置，就会报typehandler异常，解决方法也很简单:

<insert id="add" parameterType="Message">
        insert into t_message(id,content,createtime,t_student_id,t_class_id)
        values(#{id},#{content},#{createTime},#{student.id},#{class.id})
</insert>