org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property […]

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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.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.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)

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