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java.lang.NullPointerException: 	at org.hibernate.type.AbstractStandardBasicType.compare(AbstractStandardBasicType.java:225)	at org.hibernate.type.ComponentType.compare(ComponentType.java:226)	at org.hibernate.action.internal.EntityAction.compareTo(EntityAction.java:171)	at org.hibernate.engine.spi.ExecutableList.add(ExecutableList.java:222)	at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:225)	at org.hibernate.event.internal.DefaultDeleteEventListener.deleteEntity(DefaultDeleteEventListener.java:299)	at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:160)	at org.hibernate.internal.SessionImpl.fireDelete(SessionImpl.java:965)	at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:909)	at org.hibernate.engine.spi.CascadingActions$1.cascade(CascadingActions.java:74)	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.cascadeCollectionElements(Cascade.java:379)	at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:319)	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:296)	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.DefaultDeleteEventListener.cascadeBeforeDelete(DefaultDeleteEventListener.java:353)	at org.hibernate.event.internal.DefaultDeleteEventListener.deleteEntity(DefaultDeleteEventListener.java:275)	at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:160)	at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:73)	at org.hibernate.internal.SessionImpl.fireDelete(SessionImpl.java:956)	at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:896)	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.remove(AbstractEntityManagerImpl.java:1214)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)