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null id generated for:class com.vladmihalcea.hibernate.masterclass.laboratory.cascade.CascadeLockTest$PostDetails
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org.hibernate.id.IdentifierGenerationException: null id generated for:class com.vladmihalcea.hibernate.masterclass.laboratory.cascade.CascadeLockTest$PostDetails	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:119)	at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)	at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:801)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:794)	at org.hibernate.engine.spi.CascadingActions$7.cascade(CascadingActions.java:314)	at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:350)	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:293)	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)	at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)	at org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:432)	at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265)	at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)	at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)	at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)