java JAXB阻止JAXB与共享实体序列化

1 年 Questions & Answers 833

我有4个实体

purchaseRequest-资金-lineItemFunding purchaseRequest-lineItem-lineItemFunding-funding

在ManyToOne关系上，我正在lineItemFunding中使用JAXB和@XmlTransient

当来自purchaseRequest->funding-我不想让它扫描lineItemFunding，但当它从purchaseRequest来时->lineItem->lineItemFunding->Funding。我想让它对^{进行深度扫描。我遇到的问题是，如果我在lineItemFunding的getFunding()内部使用@XmlTransient，事情会很好地工作，但是如果我删除它，我会得到以下错误

Caused by: com.sun.istack.SAXException2: 
A cycle is detected in the object graph. 
This will cause infinitely deep XML: 
org.company.com.entities.Funding@2a2 
-> org.company.com.entities.LineItemFunding@82 
-> org.company.com.entities.Funding@2a2

所以我的问题是，我如何防止它试图对资金实体的lineItemFunding进行深度扫描。以下是我的消息来源

采购请求

@OneToMany(mappedBy = "purchaseRequest", cascade = CascadeType.ALL, orphanRemoval = true)
private List<LineItem> lineItems;

@OneToMany(mappedBy = "purchaseRequest", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Funding> fundings;

资金

@OneToMany(mappedBy = "funding", cascade = CascadeType.ALL, orphanRemoval = true)
private List<LineItemFunding> lineItemFundings;

@XmlTransient
@ManyToOne
@JoinColumn(name = "purchase_request_id", nullable = false)
private PurchaseRequest purchaseRequest;

行项目

@OneToMany(mappedBy = "lineItem", cascade=CascadeType.ALL, orphanRemoval=true, fetch=FetchType.EAGER)
private List<LineItemFunding> lineItemFundings;

@XmlTransient
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name = "purchase_request_id", nullable = false)
private PurchaseRequest purchaseRequest;

项目融资

@XmlTransient
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name = "line_item_id", nullable = true)
private LineItem lineItem;

//需要删除此xmlTransient，以便从行项目方向深入扫描资金实体，但在资金方向将其打断。资金不需要深入扫描linItemFunding，因为lineItemFunding只是资金与lineItem的连接

@XmlTransient
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name = "funding_id", nullable = true)
private Funding funding;

谢谢

Python中文网

有 Java 编程相关的问题?

java JAXB阻止JAXB与共享实体序列化

共 (2) 个答案

# 1 楼答案

# 2 楼答案