郁闷的我睡不着觉。高手看看吧！

原先的程序能运行，可后来加些jar包（arcims_jconnec,jcert,jnet,jsse等jar包我想没有冲突吧！），重新配置了一下web.xml，就是往里加了一个：<taglib>标签，就出错了，郁闷。错误如下，2005-11-11 8:40:11 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2005-11-11 8:40:11 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 1141 ms
2005-11-11 8:40:11 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2005-11-11 8:40:11 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/5.0.28
2005-11-11 8:40:11 org.apache.catalina.core.StandardHost start
信息: XML validation disabled
2005-11-11 8:40:13 org.apache.commons.modeler.Registry registerComponent
严重: Null component Catalina:type=JspMonitor,WebModule=//localhost/memweb,J2EEApplication=none,J2EEServer=none
java.lang.reflect.InvocationTargetException
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:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:287)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)
Caused by: java.lang.NoSuchMethodError: org.apache.log4j.Category.log(Ljava/lang/String;Lorg/apache/log4j/Level;Ljava/lang/Object;Ljava/lang/Throwable;)V
at org.apache.commons.logging.impl.Log4JCategoryLog.debug(Log4JCategoryLog.java:94)
at org.apache.catalina.session.ManagerBase.init(ManagerBase.java:627)
at org.apache.catalina.session.StandardManager.start(StandardManager.java:639)
at org.apache.catalina.core.ContainerBase.setManager(ContainerBase.java:499)
at org.apache.catalina.startup.ContextConfig.managerConfig(ContextConfig.java:315)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:635)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:216)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4290)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:789)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1083)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:478)
at org.apache.catalina.core.StandardService.start(StandardService.java:480)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2313)
at org.apache.catalina.startup.Catalina.start(Catalina.java:556)
... 6 more