JAXB 在对象图中检测到循环 [英] JAXB A cycle is detected in the object graph

问题描述

我想用 JAXB 将我的 pojo 转换为 json，我的 pojo 有一对多的关系，当我将我的 pojo 转换为 json 时，JAXB 生成错误在对象图中检测到循环.这将导致无限深的 XML".

I want to convert my pojo to json with JAXB, my pojo have one to many relation, and when i convert my pojo to json, JAXB generate error "A cycle is detected in the object graph. This will cause infinitely deep XML".

我从网上了解到，这个问题可以在@XmlID 和@XmlIDREF 的帮助下解决，但是有一个问题，我的Id 属性不是String 类型而是Long.据我所知，@XmlID 只能与 String 属性一起使用.

I read from web that, this problem can be solved with help from @XmlID and @XmlIDREF, but there is one problem, my Id attribute is not String type but Long. and as far as i know @XmlID can be used only with String property.

其他网站建议使用eclipselink MOXy，但是MOXy无法生成json.

Other web suggest using eclipselink MOXy, but MOXy cannot generate json.

推荐答案

正如你在问题中提到的 EclipseLink MOXy(我是技术主管)有 @XmlInverseReference 注解来解决双向关系的问题.从 EclipseLink 2.4 开始，MOXy 可以生成/使用 JSON.

As you mentioned in your question EclipseLink MOXy (I'm the tech lead) has the @XmlInverseReference annotation to solve the problem of bidirectional relationships. As of EclipseLink 2.4 MOXy can produce/consume JSON.

更多信息

• http://bdoughan.blogspot.com/2010/07/jpa-entities-to-xml-bidirectional.html
• http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html

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