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org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property […]	at org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:101)	at org.hibernate.mapping.Component$ValueGenerationPlan.execute(Component.java:422)	at org.hibernate.id.CompositeNestedGeneratedValueGenerator.generate(CompositeNestedGeneratedValueGenerator.java:121)	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:117)	at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)	at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)	at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:843)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:836)	at org.hibernate.ejb.engine.spi.EJB3CascadingAction$1.cascade(EJB3CascadingAction.java:53)	at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:388)	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:331)	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:209)	at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:418)	at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:358)	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:334)	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:209)	at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:166)