Cascade.ALL可以工作，但CascadeType.PERSIST不能用于保存新实体

Question

我有以下邀请：

Channel

@ManyToOne(cascade = { CascadeType.ALL })
@JoinColumn(name = "campaign_business_id")
private CampaignBusiness campaignBusiness;

@ManyToOne(cascade = { CascadeType.ALL })
@JoinColumn(name = "campaign_id")
private Campaign campaign;


Campaign

@ManyToOne(cascade = { CascadeType.ALL })
@JoinColumn(name = "event_id")
private Event event;

CampaignBusiness 
@ManyToOne
@JoinColumn(name = "campaign_id")
private Campaign campaign;

我只想使用 Cascade.PERSIST - 因为我希望记录更新，而不是在casacde上删除。

但是，当我写而不是 Cascade.ALL ， Cascade.PERSIST 时，请使用以下代码：

Event event = new Event();
Campaign campaign = new Campaign();
campaign.setEvent(event);
CampaignBusiness campaignBusiness = new CampaignBusiness();
campaignBusiness.setCampaign(campaign);
Channel channel = new Channel();
channel.setCampaign(campaign);
channel.setCampaignBusiness(campaignBusiness);
channelDAO.save(channel);

我得到了一个例外

  

org.hibernate.TransientObjectException：object引用未保存的   瞬态实例 - 在刷新之前保存瞬态实例：