首页 > 代码库 > There is a cycle in the hierarchy

There is a cycle in the hierarchy

在使用JSONObject.fromObject的时候,出现“There is a cycle in the hierarchy”异常。

意思是出现了死循环,也就是Model之间有循环包含关系;

解决办法:

使用setCycleDetectionStrategy防止自包含

代码:

JsonConfig jsonConfig = new JsonConfig();

jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);

JSONObject json =JSONObject.fromObject(model, jsonConfig);

result = json.toString();

依赖的包: 

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.util.CycleDetectionStrategy;

参考网页:

http://www.cnblogs.com/az19870227/archive/2011/09/19/2180993.html


There is a cycle in the hierarchy