一个nested exception问题

作者： / 2019年01月5日 / 技术 / 2,226条评论

一个hibernate报的异常：nested exception is org.hibernate.QueryException: could not resolve property困扰了我好一阵。

原来是因为hibernate对象不能多层嵌套查询，比如：
dc.add(Restrictions.eq(“wdxcAddressbookClass.wdxcUser.id”,ownerId));
改为：
dc.add(Restrictions.sqlRestriction(“{alias}.classid in (select id from wdxc_addressbook_class where ownerid=?)”,ownerId,Hibernate.LONG));
之后就可以了

顺便把前几天遇到的一个问题也记录一下：

环境是jsf+spring+hibernate，由于页面还没设计好，后台业务处理部分已经写好了，想测试一下，就做了一个测试jsp页面
异常信息：could not initialize proxy – the owning Session was closed
解决方法一：
[java]
public WdxcAddressbook getAddressbookByID(Serializable id) {
WdxcAddressbook addressbook =(WdxcAddressbook)dao.load(WdxcAddressbook.class,id);
//System.out.println(addressbook.getId());
return addressbook;
}
[/java]
在spring接口实现类中获取一下对象，就是上面注释掉的
解决方面二：
在web.xml中把.jsp页面也添加到hibernate的filter-mapping
原因：原来jsf的hibernate filter处理的都是.faces的页面，没有处理.jsp的页面，而且hibernate数据库实际获取操作是在用户实际获取值的时候发生的，所以需要filter把session延迟到jsp页面中

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