MongoDb query with alike criteria gives an error

Here is code;

Order order = new Order();
order.setPaymentType("1");
Query query = new Query(new Criteria().alike(Example.of(order)));
mongoTemplate.find(query, Order.class);

and it returns nothing. (there are lots of order with paymentType=1) When I try to change query like this;

Query query = new Query(Criteria.where("paymentType").alike(Example.of("1")));

it gives an error;

MongoPersistentEntity must not be null!