here was insufficient free space available after evicting expired cache entries

tomcat重启后报以下错误：

09-Dec-2016 10:57:49.150 WARNING [localhost-startStop-1] org.apache.catalina.webresources.Cache.getResource Unable to add the resource at [/WEB-INF/classes/struts/PersonnelActio
n.xml] to the cache because there was insufficient free space available after evicting expired cache entries - consider increasing the maximum size of the cache
09-Dec-2016 10:57:51.729 SEVERE [localhost-startStop-1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start: 
 org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:158)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:724)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:700)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
        at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1107)
        at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1841)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Unable to complete the scan for annotations for web application [] due to a StackOverflowError. Possible root causes include a too lo
w setting for -Xss and illegal cyclic inheritance dependencies. The class hierarchy being processed was [org.bouncycastle.asn1.ASN1EncodableVector->org.bouncycastle.asn1.DEREnco
dableVector->org.bouncycastle.asn1.ASN1EncodableVector]
        at org.apache.catalina.startup.ContextConfig.checkHandlesTypes(ContextConfig.java:2099)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2043)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1989)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1959)
        at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1912)
        at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1154)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:298)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5076)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
        ... 10 more

　　

因为系统要加载不少图片，而tomcat8以上对resource采取了cache，而默认的大小是10M. 可能超过了此限制，那么tomcat是启动不起来了。

解决的办法是在context.xml中调大缓存即可，具体如下：

<Resources cachingAllowed="true" cacheMaxSize="100000" /> 

加在</context>前就行。