问题描述：
启动logback时控制台报错：error :No RollingPolicy was set for the RollingFileAppender named XXX
问题原因：
The RollingFileAppender must be set up with a RollingPolicy. It permits the Appender to know what to do when a rollover is requested.
大意是RollingFileAppender必须包含RollingPolicy，它才能够知道什么时候发生滚动
解决方案：
在RollingFileAppender中出错的添加RollingPolicy
