If a entity uses @MapsId on another entity you can not persist both of these entities in the same transaction.
Exception obtained:
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Caused by: org.hibernate.PropertyAccessException: Could not set field value [<delayed:1>] value by reflection : [class org.hibernate.bugs.ChildEntity.id] setter of org.hibernate.bugs.ChildEntity.id
at org.hibernate.property.access.spi.SetterFieldImpl.set(SetterFieldImpl.java:61)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.setIdentifier(AbstractEntityTuplizer.java:259)
at org.hibernate.persister.entity.AbstractEntityPersister.setIdentifier(AbstractEntityPersister.java:4936)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:190)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:143)
at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:192)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:135)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:62)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:800)
... 33 more
Caused by: java.lang.IllegalArgumentException: Can not set java.lang.Long field org.hibernate.bugs.ChildEntity.id to org.hibernate.action.internal.DelayedPostInsertIdentifier
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81)
at java.lang.reflect.Field.set(Field.java:764)
at org.hibernate.property.access.spi.SetterFieldImpl.set(SetterFieldImpl.java:41)
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