jpa标准构建器编写简单查询

Question

我想从具有特定价格和特定类型的数据库实体中进行选择，但使用条件构建器将结果列表清空。我来到此代码

CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder();
CriteriaQuery<Object> criteriaQuery = criteriaBuilder.createQuery();
Root<Advert> from = criteriaQuery.from(Advert.class);
Predicate predicate1 = criteriaBuilder.ge(from.get("price"), x1);
Predicate predicate2 = criteriaBuilder.le(from.get("price"), x2);
Predicate predicate4 = criteriaBuilder.like(from.get("type"), type);
criteriaQuery.where(criteriaBuilder.and(predicate1, predicate2, predicate4));
TypedQuery<Object> typedQuery = em.createQuery(criteriaQuery);
List<Object> resultList = typedQuery.getResultList();

但它返回空List.How如何正确地重写它？