尝试更新对象时，HibernateOptimisticLockingFailureException

Question

这是我的实体：

@Entity
public class BookRisk extends CustomerBaseEntity<BookRisk, BookRiskDTO> {

    private String bookRiskData;
    private OffsetDateTime externalQueryDate;

    @OneToOne
    private Cafe cafe;

BookRisk bookRisk = bookRiskDataRepository.findByCafeId（cafe.getId（））;

        if (bookRisk == null) {

            return bookRiskDataRepository.save(
new BookRisk(bookRiskData, getExternalQueryDate(bookRiskData), cafe)).getId();

        } else {
                return bookRiskDataRepository.save(
bookRisk.modifyBookRisk(bookRisk, request.getBookRiskData(),
                        getExternalQueryDate(bookRiskData))).getId();
            }
        }

在这里，如果以前没有保存过，我想创建一个新的BookRİskData对象。不是，我想根据请求设置值，然后再次保存以进行更新。

对于更新，它将创建另一个对象，然后给出错误：

HibernateOptimisticLockingFailureException : Object of class BooktRisk] with identifier [8]: optimistic locking failed; nested exception is org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : BookRisk#8] (Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : 

我认为是因为起初我使用

findByCafeId

然后我做

save

但是我不确定。

更新方法：

 public BookRisk modifyBookRisk(BookRisk bookRisk, String bookRiskData, OffsetDateTime externalQueryDate) {

        bookRisk.setExternalQueryDate(externalQueryDate);
        bookRisk.setBookRiskData(bookRiskData);
        return bookRisk;
    }

我不更改version或id。第二次保存时，它也会增加版本。

它还有另一个课程ID。

是因为cafe吗？

COnstructor：

      public BookRisk(String bookRiskData, OffsetDateTime externalQueryDate, Cafe cafe) {
                 this.createStamp = EntityActivityDateTimeStamp.fromContext();
            this.modifyStamp = createStamp.copy();
            this.bookRiskData = bookRiskData;
            this.externalQueryDate = externalQueryDate;
            this.cafe = cafe;

;
    }

    public BookRisk() {
    }