Assert.assertNotNull(removedDetail);
Product p = Ebean.getReference(Product.class, 1);
OrderDetail newDetail = new OrderDetail(p, 899, 12.12d);
// newDetail.setOrder(order);
order.addDetail(newDetail);
EbeanServer server = Ebean.getServer(null);
JsonContext jsonContext = server.json();
String jsonString = jsonContext.toJson(order);