如何编写一个JPA查询来忽略空参数？

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    @Query("SELECT u FROM User u WHERE (:name is null or u.name = :name) and (:age is null or u.age = :age)")
    List<User> findByCondition(@Param("name") String name, @Param("age") Integer age);
}

@Repository
public interface UserRepository extends JpaRepository<User, Long>, JpaSpecificationExecutor<User> {
    List<User> findAll(Specification<User> spec);
}

public class UserSpecification {
    public static Specification<User> findByCondition(String name, Integer age) {
        return (root, query, criteriaBuilder) -> {
            List<Predicate> predicates = new ArrayList<>();
            if (name != null) {
                predicates.add(criteriaBuilder.equal(root.get("name"), name));
            }
            if (age != null) {
                predicates.add(criteriaBuilder.equal(root.get("age"), age));
            }
            return criteriaBuilder.and(predicates.toArray(new Predicate[0]));
        };
    }
}