????????session.save(classEntity);//級聯操作
/*
????????for?(StudentEntity?student:studentEntity){
????????????session.save(student);
????????}
*/

只添加班級，系統通過級聯添加學生就會報錯javax.persistence.OptimisticLockException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect)

但是只保存學生，系統就會自動級聯保存班級這樣就是正常的，

有大佬清楚問題嗎？我代碼塊里只有一個session事務