Servlet.service() for servlet [com.neuede.onlearn.web.WebDispatcher] in context with path [/onlearn] threw exception [Servlet execution threw an exception] with root cause 三月 29, 2020 11:02:19 上午 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet [com.neuede.onlearn.web.WebDispatcher] in context with path [/onlearn] threw exception [Servlet execution threw an exception] with root cause java.lang.ClassNotFoundException: Cannot find class: baseMediaMap 记录犯下的小错误 这里可以看出是数据库那里出问题了 1.缓存问题，clearn一次，在重新启动。

2.写出错了，不要怀疑，就是有小地方没有注意到，最后发现select id=“getMediaByKeyword” resultType=“baseMediaMap”>这段代码写错了，应该写成select id=“getMediaByKeyword” resultMap=“baseMediaMap”>，初学，小bug，搞死人。