Spring boot Spring Boot JPA EntityListener查询原因“；don'；t在异常发生后刷新会话"；

问题：

我使用

@PostPersist

方法创建对象A，该方法将创建对象B，这就像一个符咒！ 在创建对象B之前，我需要介绍一些逻辑，我需要查询数据库，看看数据库中是否已经存在类似的B对象。但是当我运行我的查询时

@Query("select case when count(n) > 0 then true else false end from Notification n where student = :student and initiator = :initiator and entityType = :entityType and entityId = :entityId")
boolean alreadyNotified(@Param("student") Student student, @Param("initiator") Student initiator, @Param("entityType") EntityType entityType, @Param("entityId") Long entityId);

我得到以下错误：

ERROR org.hibernate.AssertionFailure.<init>(31) - HHH000099: an assertion failure occurred (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): org.hibernate.AssertionFailure: null id in se.hitract.model.Likes entry (don't flush the Session after an exception occurs)
org.hibernate.AssertionFailure: null id in se.hitract.model.Likes entry (don't flush the Session after an exception occurs)

可能的听众：

@Component
public class LikeListener {

    @PostPersist
    public void doThis(Likes like) {
        
        NotificationService notificationService = BeanUtil.getBean(NotificationService.class);
        
        if(like.getEntityType().equals(EntityType.INSPIRATION)) {
            InspirationService inspirationService = BeanUtil.getBean(InspirationService.class);
            Inspiration inspiration = inspirationService.get(like.getEntityId());
            notificationService.createLikeNotification(inspiration.getStudent(), like.getStudent(), EntityType.INSPIRATION, inspiration.getId());
        }
        if(like.getEntityType().equals(EntityType.COMMENT)) {
            CommentService commentService = BeanUtil.getBean(CommentService.class);
            Comment comment = commentService.get(like.getEntityId());
            notificationService.createLikeNotification(comment.getStudent(), like.getStudent(), EntityType.COMMENT, comment.getId());
        }   
    }
}

问题是：

public Notification createLikeNotification(Student student, Student initiator, EntityType entityType, Long entityId) {
    if(student.equals(initiator) || alreadyNotified(student, initiator, entityType, entityId)) {
        return null;
    }
    
    Notification notification = createNotification(student,
            initiator,
            NOTIFICATION_TYPE.LIKE,
            entityType,
            entityId,
            null);

    return repository.save(notification);
}

public boolean alreadyNotified(Student student, Student initiator, EntityType entityType, Long entityId) {
    return repository.alreadyNotified(student, initiator, entityType, entityId);
}

如果我删除

alreadyNotified

-调用，则不会引发错误。我错过了什么？ 似乎Hibernate在我的查询运行之前刷新了Likes保存，但随后它失败了。我需要手动刷新/刷新吗？我认为Hibernate应该为我解决这个问题。

请参阅，第3.5.2节：“一般来说，可移植应用程序的生命周期方法不应调用EntityManager或查询操作，访问其他实体实例，或修改同一持久性上下文中的关系”。

public Notification createLikeNotification(Student student, Student initiator, EntityType entityType, Long entityId) {
    if(student.equals(initiator) || alreadyNotified(student, initiator, entityType, entityId)) {
        return null;
    }
    
    Notification notification = createNotification(student,
            initiator,
            NOTIFICATION_TYPE.LIKE,
            entityType,
            entityId,
            null);

    return repository.save(notification);
}

public boolean alreadyNotified(Student student, Student initiator, EntityType entityType, Long entityId) {
    return repository.alreadyNotified(student, initiator, entityType, entityId);
}