问题一：启动tomcat 报Unable to add the resource at [] to the cache
问题详情：
11-Nov-2019 15:44:15.456 警告 [http-nio-8080-exec-6] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/1128353_003/da6b85d5364641f3840b2464a9acb03d.jpg] to the cache for web application [/var/faceImage] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
解决办法：
第一种方法（推荐）：Tomcat 的存放目录，/conf/context.xml的context标签里面增加
<Resources cachingAllowed="true" cacheMaxSize="100000" />
第二种方法：禁用缓存，disable the cache，在context标签里面添加如下设置
<Resources cachingAllowed="false"/>
