项目中使用了以下struts jar：
activation.jar, asm-5.2.jar, asm-commons-5.2.jar ,asm-tree-5.2.jar, commons-beanutils-1.9.2.jar , commons-collections-3.2.2.jar, commons-fileupload-1.3.3.jar , commons-io-2.5.jar , commons-lang-2.5.jar, commons-lang3-3.6.jar, commons-logging-1.1.3.jar, commons-logging-api-1.1.jar , freemarker-2.3.23.jar, javassist-3.20.0-GA.jar , javax.servlet.jar ,log4j-api-2.8.2.jar mail.jar , ognl-3.1.15.jar, struts2-convention-plugin-2.5.13.jar , struts2-core-2.5.13.jar, struts2-rest-plugin-2.5.13.jar , xstream-1.4.10.jar, xwork-core-2.3.34.jar
系统上还安装了 tomcat 8.5 和 java 8。
启动后出现以下错误，请任何人有任何想法！
04-Dec-2017 11:17:29.066 SEVERE [localhost-startStop-1] org.apache.catalina.core.StandardContext.filterStart Exception starting filter [struts2]
Unable to load configuration. - bean - jar:file:/apache-tomcat-8.5.23/webapps/WebTool/WEB-INF/lib/struts2-core-2.5.13.jar!/struts-default.xml:137:154
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:512)
at org.apache.struts2.dispatcher.InitOperations.initDispatcher(InitOperations.java:75)
at org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:63)
at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:285)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:266)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4591)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5233)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
at …