问在事务方法中访问时，JPA审核LastModifiedBy/LastModifiedDate为空

EN

@CreatedBy
@Column(name = "CREATE_ID", updatable = false, nullable = false)
private String createId;

@LastModifiedBy
@Column(name = "UPDATE_ID", nullable = false)
private String updateId;

@CreatedDate
@Column(name = "CREATE_DATE", updatable = false, nullable = false)
private Date createDate;

@LastModifiedDate
@Column(name = "UPDATE_DATE", nullable = false)
private Date updateDate;

@Override
@Transactional
public MyObj create(MyObj myObj) {
    MyObj createdMyObj = myObjRepo.save(myObj);
    System.out.println(createdMyObj.getCreateId()); // This works fine
    return createdMyObj;
}

@Override
@Transactional
public MyObj update(MyObj myObj) {
    MyObj updatedMyObj = myObjRepo.save(myObj);
    System.out.println(updatedMyObj.getUpdateId()); // This is null
    return updatedMyObj;
}