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wei725
 Post subject: How to Resolve an IdentifierGenerationException?
PostPosted: Wed Feb 09, 2011 2:00 am 
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Joined: Tue Feb 17, 2009 3:36 pm
Posts: 78
I have built up a DAO layer with Hibernate and all entities share the same code as possible. During a test for a new release, I run into the following exception for one entity, but not others which share the same persistent layer code. The Hibernate annotation mapping of the entity class hasn't been changed. The DB configuration hasn't change neither. Why this exception occur? And how to resolve it?

Quote:
org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): ...

and the error stack
Quote:
at org.hibernate.id.Assigned.generate(Assigned.java:56)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:122)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:527)
at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:241)
at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:292)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:240)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:193)
at org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:320)
at org.hibernate.engine.Cascade.cascadeCollection(Cascade.java:266)
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:243)
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:193)
at org.hibernate.engine.Cascade.cascade(Cascade.java:154)
at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:479)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:357)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:144)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:527)
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:523)
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wei725
 Post subject: Re: How to Resolve an IdentifierGenerationException?
PostPosted: Thu Feb 10, 2011 2:40 pm 
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Regular

Joined: Tue Feb 17, 2009 3:36 pm
Posts: 78
The annotation configuration for the ID is the following:

Code:
   @Basic
   @Id
   @javax.persistence.SequenceGenerator(name = "my_id_sequence", sequenceName = "my_id_seq", allocationSize = 1)
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "my_id_sequence")
   @Column(name = "id")


And I notice the last value of the sequence is incremented after the exception. And something is very interesting here. If I place a try block around the save(), the entity will be saved. At this point, I can conclude that it is a bug in Hibernate 3.3.2.GA.
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