[/WEB-INF/classes/hudson/model/Messages_zh_CN.properties] to the cache for web application [/jenkins] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache 05-Jun-2017 17:47:56.287 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/WEB-INF/classes/hudson/triggers/Messages.properties] to the cache for web application [/jenkins] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache 05-Jun-2017 17:47:56.338 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/WEB-INF/classes/lib/form/helpArea.jelly] to the cache for web application [/jenkins] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache 05-Jun-2017 17:47:56.341 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/WEB-INF/classes/lib/layout/copyButton.jelly] to the cache for web application [/jenkins] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache 05-Jun-2017 17:47:56.342 警告 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/WEB-INF/classes/META-INF/services/org.kohsuke.stapler.jelly.JellyTagFileLoader] to the cache for web application [/jenkins] because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
反正就是缓存不够了
http://stackoverflow.com/questions/26893297/tomcat-8-throwing-org-apache-catalina-webresources-cache-getresource-unable-to
上面链接是stackoverflow上出现的和我一样的错误，第二个答案成功的解决了这个警告，就是把缓存弄大点。
解决办法：
context.xml中附加以下代码
<Resources cachingAllowed="true" cacheMaxSize="100000" />