hibernate多表查询问题！摆脱了！
程序运行后报错
javax.servlet.ServletException:   Invalid   path:   'null.buy_info_id '   [from   fd.mmk.zhangjian.hibernatePogo.Mmk_information_buy_info,fd.mmk.zhangjian.hibernatePogo.Mmk_information_compete_info   where   Mmk_information_compete_info.buy_info_id   =   Mmk_information_buy_info.id   and   Mmk_information_buy_info.user_id   =   ？]
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


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对象.属性 这样用有问题 先用as 然后引用才行
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把你的 HQL 帖出来
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应该是语句拼装错了吧
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from
fd.mmk.zhangjian.hibernatePogo.Mmk_information_buy_info,
fd.mmk.zhangjian.hibernatePogo.Mmk_information_compete_info
where
Mmk_information_compete_info.buy_info_id = Mmk_information_buy_info.id
and
Mmk_information_buy_info.user_id = ？
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（@！#……￥（@#&）￥&！）×￥！——
有你这么些的吗？
http://blog.csdn.net/cmtobby/archive/2007/08/22/1754994.aspx
自己好好去看下。。。
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where Mmk_information_compete_info.buy_info_id = Mmk_information_buy_info.id and Mmk_information_buy_info.user_id = ？] 
这句HQL有问题,你要么"="号后全部跟变量,要么都用?号