Hibernate OneToOne BiDirectional Additional relationships: works when pasted without an additional object, aborts when updated with a new optional object

Question

I have the following OneToOne relational setting between two objects: ChecklistItem and ButtonAction (shown in the code snippets below). This seems to be a kind of unique setting. This is a bidirectional but optional ChecklistItem, and ButtonAction is the owner, which saves the ChecklistItem foreign key as the primary key.

ChecklistItem Class:

@Entity
@Table(name = "CHECKLIST_ITEM", schema = "CHKL_APP")
public class ChecklistItem implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "CHECKLIST_ITEM_ID_SEQ")
    @SequenceGenerator(name = "CHECKLIST_ITEM_ID_SEQ", sequenceName = "CHKL_APP.CHECKLIST_ITEM_ID_SEQ")
    private Long id;

    @OneToOne(optional = true, mappedBy = "checklistItem", cascade = CascadeType.ALL)
    private ButtonAction button;

    //...
}

ButtonAction Class:

@Entity
@Table(name = "ACTION_BUTTON", schema = "CHKL_APP")
public class ButtonAction implements Serializable {
    @Id
    @Column(name = "checklist_item_id", unique = true, nullable = false, insertable = true, updatable = false)
    @GenericGenerator(name = "generate-from-checklist-item", strategy = "foreign", parameters = @Parameter(name = "property", value = "checklistItem"))
    @GeneratedValue(generator = "generate-from-checklist-item")
    private Long checklistItemId;

    @OneToOne
    @PrimaryKeyJoinColumn
    @JsonIgnore
    private ChecklistItem checklistItem;

    //...
}

I use SpringBoot, so I have a ChecklistItemRepository interface extending SpringBoot CrudRepository:

public interface ChecklistItemRepository extends CrudRepository<ChecklistItem, Long> {}

In my ChecklistItem service, I configured the save method this way:

@Service
@Transactional
public class ChecklistItemServiceImpl implements ChecklistItemService {

    @Override
    public ChecklistItem saveChecklistItem(ChecklistItem checklistItem) {
        processButtonAction(checklistItem);
        return checklistItemRepository.save(checklistItem);
    }

    private void processButtonAction(ChecklistItem checklistItem,String username) {
        ButtonAction button = checklistItem.getButton();

        if(button != null) {
            button.setChecklistItem(checklistItem);

            if(checklistItem.getId() != null){
                button.setChecklistItemId(checklistItem.getId());
            }
        }
    }

    //...
}

, ChecklistItem ( POST PUT), ButtonAction ( ) ChecklistItem ( null) save.

... ChecklistItem NEW ButtonAction ( POSTed ButtonAction), :

org.springframework.orm.jpa.JpaSystemException: attempted to assign id from null one-to-one property [com.me.chklapp.checklistitem.action.ButtonAction.checklistItem];
nested exception is org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property [com.me.chklapp.checklistitem.action.ButtonAction.checklistItem]

"", , , , . , , , . , - , , , ; .

, , , , , cheklistitem. , Hibernate , , . , ButtonAction, ?

!

Answer 1

, , ​​ , , - , , ; .

@CarlitosWay @Matthew , . CarlitosWay -, , GeneratedValue GenericGenerator . ; Hibernate, ButtonAction ID, , . , : MapsId. , , . , , , , , MapsId.

, , , Hibernate , . , , , .

ButtonAction:

@Entity
@Table(name = "ACTION_BUTTON", schema = "CHKL_APP")
public class ButtonAction implements Serializable {
    @Id
    @Column(name = "checklist_item_id", unique = true, nullable = false, insertable = true, updatable = false)
    private Long checklistItemId;

    @OneToOne
    @MapsId
    @PrimaryKeyJoinColumn
    @JsonIgnore
    private ChecklistItem checklistItem;

    //...
}

GenericGenerator GeneratedValue checklistItemId MapsId checklistItem. , , MapsId ( ChecklistItem), , ButtonAction . . ChecklistItem, ChecklistItemRepository ChecklistItemServiceImpl .

- Hibernate JPA. -, - , , , !

Answer 2

ButtonAction , ChecklistItem . ButtonAction .

, , Hibernate, .

ButtonAction ChecklistItem .