用MyEclipse5 生成的hibernate3.1相关文件(xml+POJO+DAO)， 在执行DAO中方法时总提示如下错误，网上也找不到答案，知道的帮个忙
Exception in thread "Timer-0 " java.lang.NullPointerException
at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntity
Tuplizer.java:372)
at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(Ab
stractEntityPersister.java:3121)
at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessa
ry(DefaultLoadEventListener.java:232)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultL
oadEventListener.java:173)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEv
entListener.java:87)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:830)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
at org.hibernate.type.EntityType.resolve(EntityType.java:303)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:
116)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.j
ava:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Lo
ader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2145)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2029)
at org.hibernate.loader.Loader.list(Loader.java:2024)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:375)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.ja
va:308)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java
:153)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1106)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at com.lihua.mailnews.hibernate.dao.OrderDAO.findByProperty(OrderDAO.jav
a:85)
相关代码：
OrderDAO oDao = new OrderDAO();
List orderList = oDao.findByOrderTime(new Integer(hour));
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.
public List findByProperty(String propertyName, Object value) {