Question

严重: Servlet.service() for servlet default threw exception

严重: Servlet.service() for servlet default threw exception
org.hibernate.PropertyValueException: not-null property references a null or transient value: dao.Userinfo.userName
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<form action="user!delete.action?cardId" method="post">
<input name="userinfo.cardId"/>
<input type="submit" value="提交"/>
</form>

public String delete(){
iuinfo.delete(userinfo);
return query();
}

public void delete(Userinfo userinfo) {
udao.delete(userinfo);

}

public void delete(Userinfo userinfo);

Answer 1

提示显示，dao.Userinfo.userName这个类的某个字段应该是不允许null的，而设置成了null

Answer 2

代码弄出来啊