我正在使用 Bidirectional @OneToOne 来自hibernate文档。我为测试创建了一个相同的模型。
我无法通过电话详细信息获取电话。我有个错误- Message Request processing failed; nested exception is org.hibernate.LazyInitializationException: could not initialize proxy [com.example.model.Phone#1] - no Session .
我试过很多方法，但都不管用。
请告诉我如何正确接电话？我坐了一整天试图这样做。我在网上没有找到任何选择，所以我在这里问。 Phone.java ```
@Entity(name = "Phone")
public class Phone {

    @Id
    @GeneratedValue
    private Long id;

    @Column(name = "`number`")
    private String number;

    @OneToOne(mappedBy = "phone",
            cascade = CascadeType.ALL,
            orphanRemoval = true,
            fetch = FetchType.LAZY)

    private PhoneDetails details;

    public Phone() {
    }

    public Phone(String number) {
        this.number = number;
    }

    // Getters and setters are omitted for brevity

    public void addDetails(PhoneDetails details) {
        details.setPhone( this );
        this.details = details;
    }

    public void removeDetails() {
        if ( details != null ) {
            details.setPhone( null );
            this.details = null;
        }
    }
}

`PhoneDetails.java`
@Entity(name = "PhoneDetails")
public class PhoneDetails {

    @Id
    @GeneratedValue
    private Long id;

    private String provider;

    private String technology;

    @OneToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "phone_id")
    private Phone phone;

    public PhoneDetails() {
    }

    public PhoneDetails(String provider, String technology) {
        this.provider = provider;
        this.technology = technology;
    }

    // Getters and setters are omitted for brevity

}

`LifecycleController.java`
@Controller
public class LifecycleController {

    @Autowired
    ServiceJpa serviceJpa;

    @GetMapping(value = "/savePhoneAndPhoneDetails")
    public String savePersonAddress () {

        Phone phone = new Phone( "123-456-7890" );
        PhoneDetails details = new PhoneDetails( "T-Mobile", "GSM" );

        phone.addDetails( details );
        serviceJpa.savPhone( phone );

        return "/savePhoneAndPhoneDetails";
    }

    @GetMapping(value = "/getPhone")
    public String addPersonAddress () {

        PhoneDetails address = serviceJpa.findPhoneDetailsById(2L).orElseThrow();
        Phone phone = address.getPhone();

        /* 
           An error appears here -
           could not initialize proxy
           [com.example.model.Phone#1] - no Session
        */
        System.out.println(phone.getNumber());

        return "/getPhone";
    }

}

`ServiceJpa.java`
@Service
@Transactional
public class ServiceJpa {

    @Autowired
    PhoneJpa phoneJpa;

    @Autowired
    PhoneDetailsJpa phoneDetailsJpa;

    @Transactional
    public void savPhone(Phone phone) {
        phoneJpa.save(phone);
    }

    @Transactional
    public Optional<PhoneDetails> findPhoneDetailsById(Long id) {
        return phoneDetailsJpa.findById(id);
    }

}

接口 `PhoneJpa.java` ```
@Repository
    public interface PhoneJpa extends JpaRepository<Phone, Long> {

    }

接口 PhoneDetailsJpa.java ```
@Repository
public interface PhoneDetailsJpa extends JpaRepository<PhoneDetails, Long> {

}

![](https://i.stack.imgur.com/qV8Sp.png)