Null value was assigned to a property of primitive type setter of
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所出问题：在action请求数据的过程中报出”Null value was assigned to a property of primitive type setter of”错误
报错项目：spring+hibernate
错误原因：数据库里有相应的字段为NULL，但在java中hibernate类型在生成的类中为基本类型，不能为NULL
解决办法：第一种：数据库字段不设置为空；第二种：手动修改映射文件，char为Character；第三种：在反向工程时使用Java类型，而不是hibernate类型。
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