验证Spring Jpa查询中参数的最小长度

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.validation.constraints.Size;

@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Size(min = 5)
    private String name;

    // getters and setters
}

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    List<User> findByName(@Param("name") @Size(min = 5) String name);
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import javax.validation.Valid;

@Service
public class UserService {
    private final UserRepository userRepository;

    @Autowired
    public UserService(UserRepository userRepository) {
        this.userRepository = userRepository;
    }

    public List<User> findUsersByName(@Valid @Param("name") String name) {
        return userRepository.findByName(name);
    }
}