public void doWork(Session session) throws Exception {
   XorShiftRandom rng = new XorShiftRandom(seeder.nextInt());
   Order order = new Order();
   session.persist(order);
   for (int i = 0; i < 10; i++) {
     int productId = rng.nextInt() & 1023;
     Product product = (Product) session.get(Product.class, productId);
     OrderLine orderLine = new OrderLine();
     orderLine.setOrder(order);
     orderLine.setProduct(product);
     session.persist(orderLine);
     order.getOrderLines().add(orderLine);
   }
 }