mybatis报错:Type handler was null on parameter mapping or property ‘__frch_xxx_0’

Type handler was null on parameter mapping or property ‘__frch_xxx_0’

可知是mapper.xml写错，因为使用foreach语句时，两个foreach标签中间的参数写错了

<select id=" get" parameterType="entity" resultMap="java.util.List">
  select id, name from t 
	where 
	id in
	  <foreach collection="list" item="param"  open="(" close=")" separator=",">  
	        #{param.id}
      这里直接用#{id}或#{param}，就会报错
	  </foreach>   
</select>