對象引用了未保存的瞬態實例-在刷新休眠JPA之前保存瞬態實例

Question

當我嘗試保存數據時，顯示此錯誤：

com.LTR.entity.Silicon.platform-> com.LTR.entity.Platform，

它說我需要保存瞬變。

我一直在嘗試放置cascadeType.ALL，但這不起作用。

@Entity
@Table(name="silicon",uniqueConstraints={@UniqueConstraint(columnNames = {"silicon_visual_id"})})
@EnableTransactionManagement
@DynamicUpdate
public class Silicon implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id", unique = true, nullable = false)
    private Long id;

    @Column(name="mir", unique = false, nullable = true)
    private Long mir;

    @Column(name = "silicon_name", nullable = false, length= 45)
    private String siliconName;

    @Column(name = "type_silicon", nullable = false, length= 45)
    private String typeSilicon;

    @Column(name = "qdf", nullable = true, length= 45)
    private String qdf;

    @Column(name = "silicon_visual_id", nullable = false, length= 45)
    private String siliconVisualId;

    @Column(name = "cpu_id", nullable = true, length= 45)
    private String cpuId;

    @Column(name = "stepping", nullable = true, length= 45)
    private String stepping;

    @Column(name = "socket", nullable = true, length= 45)
    private String socket;

    @Column(name = "status_silicon", nullable = false,length= 45)
    private String statusSilicon;

    @JsonIgnore
    @ManyToOne(fetch=FetchType.EAGER)
    @JoinColumn(name="user_owner", nullable = false)
    private User userOwner;

    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Column(name = "date_admission", nullable = false)
    private Date dateAdmission;

    @JsonIgnore
    @ManyToOne(fetch=FetchType.EAGER)
    @JoinColumn(name="user_request", nullable = true)
    private User userRequest;

    @JsonIgnore
    @ManyToOne(fetch=FetchType.EAGER)
    @JoinColumn(name="user_last_returned", nullable = true)
    private User userLastReturned;

    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Column(name = "date_delivered", nullable = true)
    private Date dateDelivered;

    @JsonIgnore
    @ManyToOne(fetch=FetchType.EAGER)
    @JoinColumn(name="platform_current", nullable = true)
    private Platform platform;

    @JsonIgnore
    @ManyToOne(fetch=FetchType.EAGER)
    @JoinColumn(name="platform_own", nullable = true,updatable= false)
    private Platform platformOwn;

    /*GETTERS AND SETTERS*/

@Entity
@Table(name="platform")
public class Platform implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="platform_id", unique = true, nullable = false)
    private Long platformId;

    @JsonIgnore
    @ManyToOne(fetch=FetchType.EAGER)
    @JoinColumn(name="locationId", nullable = false)
    private Location location;

    @Enumerated(EnumType.STRING)
    @JoinColumn(name="businessUnit", nullable = true)
    private BusinessUnit businessUnit;

    @Column(name = "name", nullable = false, length= 45,unique = true)
    private String name;

    @Column(name = "project", nullable = false, length= 45)
    private String project;

    @Column(name = "serialPlatform", nullable = false, length= 45, unique 
        = true)
    private String serialPlatform;

    @Column(name = "model", nullable = false, length= 45)
    private String model;

    @Column(name = "chasisSerial", nullable = false, length= 45)
    private String chasisSerial;

    @Column(name = "chasisModel", nullable = false, length= 45)
    private String chasisModel;

    @Column(name = "ismpKitName", nullable = false, length= 45)
    private String ismpKitName;

    @Column(name = "ismpSerialNumber", nullable = false, length= 45)
    private String ismpSerialNumber;

    @Column(name = "assignedTo", nullable = false, length= 45)
    private String assignedTo;

    @Column(name = "OwnedBy", nullable = false, length= 45)
    private String OwnedBy;

    @Column(name = "ismNumber", nullable = false, length= 45)
    private int ismNumber;

    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Column(name = "receivedDate", nullable = false)
    private Date receivedDate;

    @Column(name = "asset", nullable = false, length= 45)
    private int asset;

    @Column(name = "startStatus", nullable = false, length= 45)
    private boolean startStatus;

    @Column(name = "finalStatus", nullable = false, length= 45)
    private boolean finalStatus;

    @Column(name = "cloudReady", nullable = false, length= 45)
    private boolean cloudReady;

    @OneToMany(mappedBy="platform")
    private List<Annotation> annotations;

    @OneToMany(fetch = FetchType.LAZY,cascade = CascadeType.ALL, mappedBy 
        = "platform")
    private Set<Silicon> userRole = new HashSet<Silicon>();

    @OneToOne(fetch = FetchType.LAZY, mappedBy = "platform")
    private Host Host;

    /*GETTERS AND SETTERS*/

org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.LTR.entity.Silicon.platform -> com.LTR.entity.Platform; nested exception is java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.LTR.entity.Silicon.platform -> com.LTR.entity.Platform

2019-09-09 08:32:43.161 ERROR 21968 --- [nio-8081-exec-9] o.h.i.ExceptionMapperStandardImpl        : HHH000346: Error during managed flush [org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.LTR.entity.Silicon.platform -> com.LTR.entity.Platform]
2019-09-09 08:32:43.172  INFO 21968 --- [nio-8081-exec-9] com.LTR.controller.SiliconController     : org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.LTR.entity.Silicon.platform -> com.LTR.entity.Platform; nested exception is java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.LTR.entity.Silicon.platform -> com.LTR.entity.Platform

2019-09-09 09:25:45.500  WARN 8000 --- [nio-8081-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Error: 1048, SQLState: 23000
2019-09-09 09:25:45.500 ERROR 8000 --- [nio-8081-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper   : Column 'owned_by' cannot be null
2019-09-09 09:25:45.506 ERROR 8000 --- [nio-8081-exec-1] o.h.i.ExceptionMapperStandardImpl        : HHH000346: Error during managed flush [org.hibernate.exception.ConstraintViolationException: could not execute statement]
2019-09-09 09:25:45.517  INFO 8000 --- [nio-8081-exec-1] com.LTR.controller.SiliconController     : org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement

我不知道為什么當我嘗試更新或插入時因此錯誤而崩潰，並且這僅在當我嘗試更新時平台對象為null時發生

當我設置cascadeType.ALL時，它使來自平台實體的ownedBy為空，但在數據庫中不為空

Answer 1

將Cascade =“ all”屬性添加到所有屬性。

像下面

@JsonIgnore
@ManyToOne(fetch=FetchType.EAGER, optional=true, cascade=CascadeType.ALL)
@JoinColumn(name="platform_current", nullable = true)
private Platform platform;

您需要設置optional=true 。

@Column（nullable = true）指示DDL生成工具包括NULL SQL列類型約束。

有關可選與可為空的更多信息，請查看此StackOverflow答案。

Answer 2

您需要先保存平台，然后再保存芯片，因此Persist是您在此處需要的CascadeType。

@JsonIgnore
@ManyToOne(fetch=FetchType.EAGER, cascade = CascadeType.PERSIST)
@JoinColumn(name="platform_current", nullable = true)
private Platform platform;