Json转换成字符串，There is a cycle in the hierarchy解决办法

1、原因由于对象内部相互引用出现死循环，而导致的错误；解决办法，排除掉相关的可以导致循环引用的对象。

      如下：

     JsonConfig jsonConfig = new JsonConfig();jsonConfig.setJsonPropertyFilter(new PropertyFilter() {@Overridepublic boolean apply(Object source, String name, Object value) {Set<String>  propertyNameList = new HashSet<String>();propertyNameList.add("itemQueryServiceClient");propertyNameList.add("uicExtraReadServiceClient");propertyNameList.add("shopReadService");propertyNameList.add("readServices");propertyNameList.add("bmQuali");if (propertyNameList.contains(name)) {return true;}return false;}});JSONObject jsonObject = JSONObject.fromObject(super.getPage(),jsonConfig);