Exception starting filter struts2 (转载)
严重: Exception starting filter struts2 java.lang.ClassNotFoundException: prg.apache.struts2.dispatcher.FilterDispatcher at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1666) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1511) at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:406) at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:388) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:117) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:248) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:368) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:98) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4193) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4801) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:988) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:771) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:988) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:275) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:427) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:649) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139) at org.apache.catalina.startup.Catalina.start(Catalina.java:585) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:415) 2010-12-1 13:10:06 org.apache.catalina.core.StandardContext startInternal 严重: Error filterStart 2010-12-1 13:10:06 org.apache.catalina.core.StandardContext startInternal 严重: Context [/struts2] startup failed due to previous errors
commons-logging-api-1.1.jar
freemarker-2.3.8.jar
ognl-2.6.11.jar
struts2-core-2.0.12.jar
xwork-2.0.6.jar
struts2使用的是Filter充当Control需要配置web.xml如下：注意类名和包名不要写错
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.do</url-pattern>
<!--这里的url-pattern视你的具体情况而定-->
</filter-mapping>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/struts/*</url-pattern>
</filter-mapping>
如果以上两步都没有问题，那估计就是环境问题了，在开发中，环境问题是麻烦的事，检查你用的部署服务器（Tomcat或weblogic等）、IDE的版本（eclipse或者myEclipse），以及Struts2的版本...
struts2项目中web.xml配置2.1与2.0的区别
具体的过滤器类变了，2.0配置是以上写法
2.1以后是这样配置
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>另外，也与你导入jar包的位置有关，建议最好放入工程WEB-INF下的lib目录里，有时不能识别