net.sf.json.JSONException: There is a cycle in the hierarchy! 解决方法
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通常出现这个问题就是hibernate主外键关联的错误，因为存在相互关联的问题，所以在bean转换成json的时候会不断的拆开实体属性，直到没有为止。
解决方法一：hibernate使用lazy=true(懒加载)的方法，相应的字段在没有主动请求的时候不加载数据
解决方法二：
JsonConfig cfg = new JsonConfig(); cfg.setJsonPropertyFilter(new PropertyFilter() { public boolean apply(Object source, String name, Object value) { if(name.equals("XX")||name.equals("XX")) { return true; } else { return false; } } });使用这种方法将相应的属性进行过滤最后调用
JSONArray.fromObject(mychildren,cfg);
就没有问题了
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