No converter found for return value of type: class io.renren.utils.R
后台返回的code为0，代表成功，可是在浏览器却一直是500错误，点开错误链接可以看到下图所示的错误页面 上图红框位置说明了，R对象的数据不能被转换成json返回给前端 解决方法： 添加jackson-databind包，@ResponseBody才可以将返回对象转换为json格式 <dependency>
<groupId>com.fasterxml.jackson.core</grou
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