java JSON返回空内容

Question

我有个问题， 我的JSON不会返回应该通过OneToMany关系返回给我的内容。 它应该将Person对象的详细信息返回给我，而不是返回一个空数组。 下面是我所有的代码

人。爪哇

@Entity
@Table(name = "person_table")
public class Person implements Serializable{

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name = "person_id")
private Long id;
@Column(name = "person_name")
private String name;
@Column(name = "person_lastname")
private String lastname;
@Column(name = "person_details")
@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
@JoinColumn(name = "person_id")
private List<PersonDetails> details = new ArrayList<>();

Person(){}

//getters, setters

个人信息。爪哇

@Entity
@Table(name = "person_details")
public class PersonDetails implements Serializable{

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id_details")
private Long id;
@Column(name = "age_person")
private int age;
private String city;
private String country;
private int phoneNumber;
@ManyToOne(fetch =  FetchType.LAZY)
@JoinColumn(name = "details_id")
private Person person;

PersonDetails(){}
//getters,setters

人格的。爪哇

@Repository
public interface PersonRepository extends JpaRepository<Person, Long>{
}

个人主义。爪哇

@Repository
public interface PersonDetailsRepository extends JpaRepository<PersonDetails, Long> {
    List<PersonDetails> getByPersonId(Long id);
}

人事管理员。爪哇

@RestController
@RequestMapping("/api/persons")
public class PersonDetailsController {

PersonRepository personRepository;
PersonDetailsRepository personDetailsRepository;

@Autowired
public PersonDetailsController(PersonDetailsRepository personDetailsRepository, PersonRepository personRepository) {
    this.personDetailsRepository = personDetailsRepository;
    this.personRepository = personRepository;
}


@GetMapping("/{id}/details")
List<PersonDetails> getDetails(@PathVariable Long id){
    return personDetailsRepository.getByPersonId(id);
}

}

我跳过人事管理员。爪哇

当我转到uri:localhost:8080/api/persons/1/details时我的JSON：

[]