Log4j问题求助！！
Struts包中不是已经包含commons.logging.jar这个文件了吗
为什么还报下面的异常
java.lang.ClassNotFoundException:  
at   java.lang.Class.forName0(Native   Method)
at   java.lang.Class.forName(Class.java:169)
at   org.apache.commons.logging.impl.LogFactoryImpl$1.run(LogFactoryImpl.java:447)
at   java.security.AccessController.doPrivileged(Native   Method)
at   org.apache.commons.logging.impl.LogFactoryImpl.loadClass(LogFactoryImpl.java:435)
at   org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:376)
at   org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
at   org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at   org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at   org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at   org.apache.struts.action.ActionServlet. <clinit> (ActionServlet.java:226)
at   sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native   Method)
at   sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at   sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at   java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at   java.lang.Class.newInstance0(Class.java:355)
at   java.lang.Class.newInstance(Class.java:308)
at   org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1104)
at   org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:981)
at   org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4044)
at   org.apache.catalina.core.StandardContext.start(StandardContext.java:4350)
at   org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:761)
at   org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:741)
at   org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
at   org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:825)
at   org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:714)
at   org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:490)
at   org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
at   org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at   org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
at   org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1023)
at   org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at   org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1015)
at   org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at   org.apache.catalina.core.StandardService.start(StandardService.java:448)
at   org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at   org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at   sun.reflect.NativeMethodAccessorImpl.invoke0(Native   Method)
at   sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at   java.lang.reflect.Method.invoke(Method.java:597)
at   org.apache.catalina.startup.Bootstrap.start(Bootstrap.jav