1.严重: Exception starting filter struts2 java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
解答：web.xml文件配置里，org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter后面不要加.class
<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter>
原文：http://www.cnblogs.com/thinksasa/p/4296615.html