Type handler was null on parameter mapping for property '__frch_productId_0'. It was either not spec
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出现如上错误，原因： 在mybatis使用<foreach>标签的时候 ， collection 为传入的List item为里面的对象，如果直接对item取值就会出现如此错误。
解决：对item进行取值
------------------------------------------------------
bean ： student{id ,name，gender，score}
dao： public List<student> getStudentList( List<student> param);注： 这里通过student 的id来查询学生信息
XML：<foreach collection="param" index="index" item="l" open="("
separator="OR" close=")">
id= #{id}错误写法
id=#{l.id}正确写法
</foreach>
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