Question

我处于这种情况。我有三个实体：Form，FormComponent和FormComponentJoin。它是额外列的多对多关系。我想保存一个表单实体和他的所有孩子只需要一次调用FormRepository save（）方法，但它不起作用。这是错误消息：错误由以下原因引起：org.hibernate.TransientPropertyValueException：对象引用未保存的瞬态实例 - 在刷新之前保存瞬态实例这些是我的实体：

@Data
@Entity
@Table(name = "form")
@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode
public class Form implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(generator = "system-uuid")
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    private String id;

    private String name;

    @OneToMany(mappedBy = "form", cascade = { CascadeType.PERSIST, CascadeType.MERGE }, orphanRemoval = true)
    @NotFound(action = NotFoundAction.IGNORE)
    @Singular
    private List<FormComponentJoin> formComponentJoin = new ArrayList<>();

}

@Data
@EqualsAndHashCode
@Entity
@Table(name = "form_component")
@AllArgsConstructor(suppressConstructorProperties = true)
@NoArgsConstructor
public class FormComponent implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(generator = "system-uuid")
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    private String id;

    @JsonIgnore
    @OneToMany(mappedBy = "formComponent", cascade = CascadeType.ALL, orphanRemoval = true)
    @NotFound(action = NotFoundAction.IGNORE)
    private List<FormComponentJoin> formComponentJoin = new ArrayList<>();

    @ManyToOne
    @JsonIgnore
    private FormComponent parent;

    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL)
    @Singular
    private List<FormComponent> children;

    private String value;
}

@Entity
@Table(name = "form_component_join")
@Data
@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode
public class FormComponentJoin implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(generator = "system-uuid")
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    private String id;

    @ManyToOne
    @JoinColumn(name = "form_id", referencedColumnName = "id")
    @NotFound(action = NotFoundAction.IGNORE)
    @JsonIgnore
    private Form form;

    @ManyToOne
    @JoinColumn(name = "form_component_id", referencedColumnName = "id")
    @NotFound(action = NotFoundAction.IGNORE)
    private FormComponent formComponent;

    @Column(name = "position")
    private int pos;

}

@Repository
@Transactional(readOnly = true)
public interface FormRepository extends PagingAndSortingRepository<Form, String> {

}

为了进行测试，我使用CommandLineRunner：

@Bean
public CommandLineRunner initDatabase(FormRepository formRepository) {
    return (args) -> {

    FormComponent formComponent1 = FormComponent.builder().value("test").build();
    formComponent1.setChildren(null);
    formComponent1.setParent(null);

    FormComponentJoin formComponentJoin1 = FormComponentJoin.builder().pos(1).formComponent(formComponent1).build();

    Form form = Form.builder().name("test").build()).child(formComponentJoin1).build();
    formComponentJoin1.setForm(form);       

    form = formRepository.save(form);   

}

这是完整的堆栈跟踪：

引起：org.hibernate.TransientPropertyValueException：对象引用未保存的瞬态实例 - 在刷新之前保存瞬态实例：org.fao.backend.entity.FormComponentJoin.formComponent - ＆gt; org.fao.backend.entity.FormComponent at org.hibernate.engine.spi.CascadingActions $ 8.noCascade（CascadingActions.java:398）在org.hibernate.engine.internal.Cascade.cascade（Cascade.java:129） at org.hibernate.event.internal.AbstractSaveEventListener.cascadeBeforeSave（AbstractSaveEventListener.java:442）在org.hibernate.event.internal.DefaultPersistEventListener.justCascade（DefaultPersistEventListener.java:188）在org.hibernate.event.internal.DefaultPersistEventListener.entityIsPersistent（DefaultPersistEventListener.java:181）在org.hibernate.event.internal.DefaultPersistEventListener.onPersist（DefaultPersistEventListener.java:145）在org.hibernate.internal.SessionImpl.firePersistOnFlush（SessionImpl.java:838）在org.hibernate.internal.SessionImpl.persistOnFlush（SessionImpl.java:831）在org.hibernate.engine.spi.CascadingActions $ 8.cascade（CascadingActions.java:357）在org.hibernate.engine.internal.Cascade.cascadeToOne（Cascade.java:350）在org.hibernate.engine.internal.Cascade.cascadeAssociation（Cascade.java:293）在org.hibernate.engine.internal.Cascade.cascadeProperty（Cascade.java:161）在org.hibernate.engine.internal.Cascade.cascadeCollectionElements（Cascade.java:379）在org.hibernate.engine.internal.Cascade.cascadeCollection（Cascade.java:319）在org.hibernate.engine.internal.Cascade.cascadeAssociation（Cascade.java:296）在org.hibernate.engine.internal.Cascade.cascadeProperty（Cascade.java:161）在org.hibernate.engine.internal.Cascade.cascade（Cascade.java:118）在org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush（AbstractFlushingEventListener.java:167）在org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes（AbstractFlushingEventListener.java:158） at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions（AbstractFlushingEventListener.java:91）在org.hibernate.event.internal.DefaultFlushEventListener.onFlush（DefaultFlushEventListener.java:55）在org.hibernate.internal.SessionImpl.flush（SessionImpl.java:1258）在org.hibernate.internal.SessionImpl.managedFlush（SessionImpl.java:425） at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit（JdbcTransaction.java:101） at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit（AbstractTransactionImpl.java:177）在org.hibernate.jpa.internal.TransactionImpl.commit（TransactionImpl.java:77） ...省略了58个常见帧

Answer 1

最终我理解错误是FormComponentJoin实体中的映射。

这是新的映射：

@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REMOVE })
@JoinColumn(name = "form_id") // , referencedColumnName = "id"
@NotFound(action = NotFoundAction.IGNORE)
@JsonIgnore
private Form form;

@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE })
@JoinColumn(name = "form_component_id") // , referencedColumnName = "id"
@NotFound(action = NotFoundAction.IGNORE)
private FormComponent formComponent;

与额外列Jpa

1 个答案: