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java.lang.NullPointerException: 	at org.hibernate.type.AbstractStandardBasicType.compare(AbstractStandardBasicType.java:221)	at org.hibernate.type.ComponentType.compare(ComponentType.java:230)	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:219)	at org.hibernate.event.internal.DefaultDeleteEventListener.deleteEntity(DefaultDeleteEventListener.java:299)	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:916)	at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:892)	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.remove(AbstractEntityManagerImpl.java:1214)	at hibernatetest.Main.test(Main.java:23)	at hibernatetest.Main.main(Main.java:9)