CriteriaBuilder builder = entityManager.getCriteriaBuilder();
            CriteriaQuery<SomeEntity> criteria = builder.createQuery(SomeEntity.class);

            Root<SomeEntity> root = criteria.from(SomeEntity.class);

            Specification<SomeEntity> specification = (roott, criteriaQuery, criteriaBuilder) -> {
                Path<Integer> idField = root.get("id");
                assertEquals(idField.getJavaType(), Integer.class);
                return criteriaBuilder.equal(idField, id1);
            };

            criteria.where(specification.toPredicate(root, criteria, builder));
            criteria.select(root);

            assertEquals(entityManager.createQuery(criteria).getResultList().size(), 1);