當我嘗試保存物體時，傳遞的分離物體持續存在-有解無憂

當我嘗試將用戶物體保存到資料庫時 org.hibernate.PersistentObjectException: detached entity passed to persist: kpi.diploma.ovcharenko.entity.user.AppUser 出現此錯誤一些更多資訊此錯誤出現在哪里

at kpi.diploma.ovcharenko.service.user.LibraryUserService.createPasswordResetTokenForUser(LibraryUserService.java:165) ~[classes/:na]
    at kpi.diploma.ovcharenko.service.user.LibraryUserService$$FastClassBySpringCGLIB$$ca63bf4b.invoke(<generated>) ~[classes/:na]
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.10.jar:5.3.10]
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688) ~[spring-aop-5.3.10.jar:5.3.10]
    at kpi.diploma.ovcharenko.service.user.LibraryUserService$$EnhancerBySpringCGLIB$$6160822e.createVerificationTokenForUser(<generated>) ~[classes/:na]
    at kpi.diploma.ovcharenko.service.activation.RegistrationListener.confirmRegistration(RegistrationListener.java:39) ~[classes/:na]
    at kpi.diploma.ovcharenko.service.activation.RegistrationListener.onApplicationEvent(RegistrationListener.java:32) ~[classes/:na]
    at kpi.diploma.ovcharenko.service.activation.RegistrationListener.onApplicationEvent(RegistrationListener.java:16) ~[classes/:na]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:421) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:378) ~[spring-context-5.3.10.jar:5.3.10]
    at kpi.diploma.ovcharenko.controller.UserController.registerUserAccount(UserController.java:96) ~[classes/:na]

如您所見，此方法中出現錯誤。在這種方法中，我為用戶創建了一個驗證令牌

@Override
@Transactional
public void createVerificationTokenForUser(final AppUser user, final String token) {
    final VerificationToken myToken = new VerificationToken(token, user);
    verificationTokenRepository.save(myToken);
}

我在我的 RegistrationListener 中呼叫此方法

private void confirmRegistration(OnRegistrationCompleteEvent event) {
    AppUser user = event.getUser();
    log.info(user.toString());
    String token = UUID.randomUUID().toString();
    userService.createVerificationTokenForUser(user, token);

    final SimpleMailMessage email = constructEmailMessage(event, user, token);
    mailSender.send(email);
}

以及我如何在 RegistrationListener 中呼叫我的 confirmRegistration 方法

@Override
public void onApplicationEvent(OnRegistrationCompleteEvent event) {   
   this.confirmRegistration(event);                  
}

我在控制器中使用的這個 RegistrationListener 像這樣

 @PostMapping("/registration")
    public String registerUserAccount(@ModelAttribute("user") @Valid UserModel userModel, BindingResult result, HttpServletRequest request) {
        AppUser existing = userService.findByEmail(userModel.getEmail());
        if (existing != null) {
            result.rejectValue("email", null, "There is already an account registered with that email");
        }

        if (result.hasErrors()) {
            return "registration";
        }

        AppUser registeredUser = userService.save(userModel);
        log.info(registeredUser.toString());

        String appUrl = request.getContextPath();
        eventPublisher.publishEvent(new OnRegistrationCompleteEvent(registeredUser, request.getLocale(), appUrl));

        return "redirect:/regSuccessfully";
    }

如您所見，我在控制器和偵聽器中有 log.info()，這是因為我認為問題可能是因為用戶 ID 有問題，但是，當我的日志顯示用戶和用戶 ID 是一切時行

2022-05-16 21:33:27.522  INFO 65143 --- [nio-8080-exec-7] k.d.o.controller.UserController          : AppUser{id=42, firstName='[email protected]', lastName='[email protected]', email='[email protected]', telephoneNumber='', password='$2a$10$4ao20SYR2QJsQ.Fj50Jek.ZBRG0R0g9N8t3iaksUx2.byIb0fj6Y6', registrationDate=2022-05-16 21:33:27.492, enabled=false, roles=[kpi.diploma.ovcharenko.entity.user.UserRole@bbe3026f], bookCards=[]}
2022-05-16 21:33:27.523  INFO 65143 --- [nio-8080-exec-7] k.d.o.s.activation.RegistrationListener  : AppUser{id=42, firstName='[email protected]', lastName='[email protected]', email='[email protected]', telephoneNumber='', password='$2a$10$4ao20SYR2QJsQ.Fj50Jek.ZBRG0R0g9N8t3iaksUx2.byIb0fj6Y6', registrationDate=2022-05-16 21:33:27.492, enabled=false, roles=[kpi.diploma.ovcharenko.entity.user.UserRole@bbe3026f], bookCards=[]}

還有一點是，在我嘗試注冊用戶后，我收到了上述錯誤，但我的用戶已成功保存到資料庫中 [ 當我嘗試保存物體時，傳遞的分離物體持續存在

這是我的 AppUser 類和 VerificationToken 類

@Getter
@Setter
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
@Table(uniqueConstraints = @UniqueConstraint(columnNames = "email"), name = "library_user")
public class AppUser {
    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @NotEmpty
    @Column(name = "first_name")
    private String firstName;

    @NotEmpty
    @Column(name = "last_name")
    private String lastName;

    @NotEmpty
    @Email
    @Column(name = "email")
    private String email;

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

    @NotEmpty
    @Column(name = "password")
    private String password;

    @CreationTimestamp
    @Column(name = "create_time")
    private Timestamp registrationDate;


    @Column(name = "enabled")
    private boolean enabled;

    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinTable(
            name = "user_roles",
            joinColumns = @JoinColumn(name = "user_id"),
            inverseJoinColumns = @JoinColumn(name = "role_id")
    )
    private Collection<UserRole> roles = new HashSet<>();

    @EqualsAndHashCode.Exclude
    @OnDelete(action = OnDeleteAction.CASCADE)
    @OneToMany(mappedBy = "book", fetch = FetchType.EAGER)
    private Set<BookCard> bookCards = new HashSet<>();

    public void addBookCard(BookCard bookCard) {
        bookCards.add(bookCard);
        bookCard.setUser(this);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        AppUser user = (AppUser) o;
        return Objects.equals(id, user.id) &&
                Objects.equals(firstName, user.firstName) &&
                Objects.equals(lastName, user.lastName) &&
                Objects.equals(email, user.email) &&
                Objects.equals(password, user.password);
    }

    @Override
    public int hashCode() {
        return Objects.hash(id, firstName, lastName, email, password);
    }

    public void setRoles(Collection<UserRole> roles) {
        this.roles = roles;
    }

    @Override
    public String toString() {
        return "AppUser{"  
                "id="   id  
                ", firstName='"   firstName   '\''  
                ", lastName='"   lastName   '\''  
                ", email='"   email   '\''  
                ", telephoneNumber='"   telephoneNumber   '\''  
                ", password='"   password   '\''  
                ", registrationDate="   registrationDate  
                ", enabled="   enabled  
                ", roles="   roles  
                ", bookCards="   bookCards  
                '}';
    }
}

@Getter
@Setter
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Builder(toBuilder = true)
@Table(name = "verification_token")
public class VerificationToken {
    private static final int EXPIRATION = 60 * 24;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String token;

    @OneToOne
    @JoinColumn(nullable = false, name = "user_id", foreignKey = @ForeignKey(name = "FK_VERIFY_USER"))
    private AppUser user;

    private Date expiryDate;

    public VerificationToken(final String token, final AppUser user) {
        super();
        this.token = token;
        this.user = user;
        this.expiryDate = calculateExpiryDate();
    }

    public Long getId() {
        return id;
    }

    public String getToken() {
        return token;
    }

    public void setToken(final String token) {
        this.token = token;
    }

    public AppUser getUser() {
        return user;
    }

    public void setUser(final AppUser user) {
        this.user = user;
    }

    public Date getExpiryDate() {
        return expiryDate;
    }

    public void setExpiryDate(final Date expiryDate) {
        this.expiryDate = expiryDate;
    }

    private Date calculateExpiryDate() {
        final Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(new Date().getTime());
        cal.add(Calendar.MINUTE, VerificationToken.EXPIRATION);
        return new Date(cal.getTime().getTime());
    }

    public void updateToken(final String token) {
        this.token = token;
        this.expiryDate = calculateExpiryDate();
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        VerificationToken that = (VerificationToken) o;
        return Objects.equals(token, that.token) && Objects.equals(user, that.user) && Objects.equals(expiryDate, that.expiryDate);
    }

    @Override
    public int hashCode() {
        return Objects.hash(token, user, expiryDate);
    }
}

我嘗試了cascade type的不同變體，例如 (cascade = CascadeType.ALL, cascade = CascadeType.MERGE)。此外，正如您在 VerificationToken 類中看到的那樣，我嘗試洗掉任何型別的級聯，但這對我沒有幫助。我不知道如何解決這個問題

uj5u.com熱心網友回復：

您可能會在事務中加載用戶，然后創建并發布您設定用戶的事件。在您創建和發布事件的事務方法結束后，事務也結束并且AppUser物體與持久性背景關系分離。為了像您剛剛從存盤庫或中獲得的物體一樣進一步使用它EntityManager，您需要將其“重新附加”到背景關系中。您可以在Hibernate 檔案或此Baldung 文章中閱讀有關 Hibernate 物體生命周期的更多資訊。

或者，您可以AppUser在要保留VerificationToken. 例如，您可以將方法更改為：

private final AppUserRepository appUserRepository;

@Override
@Transactional
public void createVerificationTokenForUser(final String userId, final String token) {
    final AppUser user = appUserRepository.findById(userId).orElseThrow();
    final VerificationToken myToken = new VerificationToken(token, user);
    verificationTokenRepository.save(myToken);
}

轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/477141.html

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