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java.lang.NullPointerException at at at org.hibernate.action.internal.EntityAction.compareTo( at org.hibernate.engine.spi.ExecutableList.add( at org.hibernate.engine.spi.ActionQueue.addAction( at org.hibernate.event.internal.DefaultDeleteEventListener.deleteEntity( at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete( at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete( at org.hibernate.internal.SessionImpl.fireDelete( at org.hibernate.internal.SessionImpl.delete( at org.hibernate.jpa.spi.AbstractEntityManagerImpl.remove( at hibernatetest.Main.test( at hibernatetest.Main.main(