延迟加载解决办法
http://www.cnblogs.com/firetruck/archive/2009/06/04/1496071.html
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http://feiyan.iteye.com/blog/419537
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http://www.iteye.com/wiki/topic/419537
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http://lz726.iteye.com/blog/116616
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?<joined-subclass name="cn.ccw.au.db.pojo.Meeting" table="au_meeting" lazy="false" >
子类里也需要添加
