egg:如何设置返回的数据格式是json，还是xml

SpringBoot:redis存储object报错：Cannot serialize 不能序列化的错

qq_38910770: 还是报错，大神指导下[code=java] public class ReturnResult implements Serializable{} 执行这个 ("dlcookie",object,30, ); 报错: : Cannot serialize; nested exception is : Failed to serialize object using DefaultSerializer; nested exception is : at (:93) at (:117) at (:180) at (:187) at .dj_nsrxx(:47) at