在hibernate中没有发现对象异常

Question

我真的被这个错误卡住了

org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [com.my.farmer.vo.crop.CropProfile#genus]
at org.hibernate.impl.SessionFactoryImpl$1.handleEntityNotFound(SessionFactoryImpl.java:375)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:145)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:179)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:103)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:557)
at org.hibernate.type.EntityType.resolve(EntityType.java:379)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:116)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1851)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:42)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2992)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:395)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:375)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:139)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:179)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:103)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:557)
at org.hibernate.type.EntityType.resolve(EntityType.java:379)
at org.hibernate.type.ComponentType.resolve(ComponentType.java:584)
at org.hibernate.type.ComponentType.nullSafeGet(ComponentType.java:275)
at org.hibernate.loader.Loader.getKeyFromResultSet(Loader.java:1088)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:553)
at org.hibernate.loader.Loader.doQuery(Loader.java:689)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2211)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2095)
at org.hibernate.loader.Loader.list(Loader.java:2090)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:388)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:920)
at org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:1)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:405)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:373)
at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:911)
at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:903)
at com.my.farmer.dao.impl.MarketDAOHibernateImpl.fetchMarket(MarketDAOHibernateImpl.java:46)
at com.my .farmer.bo.impl.MarketBOImpl.fetchMarket(MarketBOImpl.java:32)
at com.my.farmer.service.impl.MarketServiceImpl.triggerAdvisory(MarketServiceImpl.java:32)
at ClientSpringTester.main(ClientSpringTester.java:26)  

我有三个类作物，作物概况和作物物种。

class crop{ cropId(PK), Cropprofile profile id (FK), Cropspecies speciesId(FK)  }  
class cropprofile{ profileid(pk),  genus(unique),  family  }  
class cropspecies{  speciesid(PK), Croprofile genus(FK) }    

给你准确的错误来源，我有

class Marketfeed  {  
Crop cropId,  
Market marketId  }  

在市场饲料cropId和marketId是复合键。当我做a.find(from Marketfeed market)
产生错误信息error。我没有使用任何搜索条件。

谁能指出这个错误的可能原因?

Answer 1

看起来你正在使用session.load(Object.class,id);来解决这个问题，你应该使用session.get(Object.class,id);

现在解释:

Session.load(Object.class,id) -返回对象代理，如果该对象不存在，则抛出您正在获得的异常。

session.get(Object.class,id) -返回对象本身而不是它的代理，如果这个对象不存在返回null

希望有帮助。

Answer 2

根据指定的主键加载的内容在数据库中不存在

Answer 3

class crop{ profile id (FK), speciesId(FK) }

这听起来像是你在实体中引用了id，而你应该引用对象:

@Entity
public class Crop{
    @ManyToOne // or @OneToOne
    private CropProfile profile;
    @ManyToOne // or @OneToOne
    private CropProfile profile;
    // getters and setters omited
}