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)