JPA/Hibernate: persist vs. save

Wed, 18 Jul 2007 22:53:45 -0700 

Dobry den,
pri hrani si s JPA/Hibernate jsem narazil na chovani, ktery si nedokazu tak uplne vysvetlit. Jde o kaskadove ukladani objektu. Mam dva objekty 

@Entity
public class Relation{
  @ManyToOne(cascade=CascadeType.ALL) // radek 3
   private Concept firstArg;
   // ...
}

@Entity
public class Concept {
   // ... nezajimavy obsah
}

Vytvorim instanci Relation, ktera obsahuje neulozenou instanci Concept.


*session.saveOrUpdate(relation)* funguje podle ocekavani. Stejne tak i 
*session.save()* a *session.persist()*



Ja ale potrebuju aby se koncept v relaci kaskadove ukladal, ale nemazal. 
Takze radek 3 by mel vypadat:

@ManyToOne(cascade={CascadeType.PERSIST, CascadeType.MERGE})


*session.persits(relation)* funguje podle ocekavani, ale 
*session.save()* i *session.saveOrUpdate()* skonci s vyjimkou:
TransientObjectException: object references an unsaved transient 
instance - save the transient instance before flushing: 
swingmuf.model.Concept



Pomuze, kdyz pridam na radek 3 hibernate-specific anotaci 
@Cascade(org.hibernate.annotations.CascadeType.SAVE_UPDATE)


Je tohle normalni chovani?

Pouzivam Hibernate 3.2.3 GA

Diky
   kolisko


Kompletni trace stack:


org.hibernate.TransientObjectException: object references an unsaved 
transient instance - save the transient instance before flushing: 
swingmuf.model.Concept
   at 
org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:219)

   at org.hibernate.type.EntityType.getIdentifier(EntityType.java:397)
   at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:242)
   at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:576)

   at 
org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3121)
   at 
org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:472)
   at 
org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:197)
   at 
org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:120)
   at 
org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196)
   at 
org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
   at 
org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)

   at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
   at swingmuf.db.DAOHelper.save(DAOHelper.java:34)
   at swingmuf.db.DAOHelper.save(DAOHelper.java:45)
   at swingmuf.db.RitDAO.save(RitDAO.java:57)
   at swingmuf.db._test.TestRitDao.testSaveAndLoad(TestRitDao.java:26)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
   at java.lang.reflect.Method.invoke(Unknown Source)
   at junit.framework.TestCase.runTest(TestCase.java:154)
   at junit.framework.TestCase.runBare(TestCase.java:127)
   at junit.framework.TestResult$1.protect(TestResult.java:106)
   at junit.framework.TestResult.runProtected(TestResult.java:124)
   at junit.framework.TestResult.run(TestResult.java:109)
   at junit.framework.TestCase.run(TestCase.java:118)

   at 
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
   at 
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
   at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
   at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
   at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
   at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)



























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