哪位大佬能帮我看一下我的报错信息，萌新表示看不懂

Question

2018-5-24 17:17:10 org.apache.catalina.core.AprLifecycleListener init信息: Loaded APR based Apache Tomcat Native library 1.1.34 using APR version 1.5.1.2018-5-24 17:17:10 org.apache.catalina.core.AprLifecycleListener init信息: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].2018-5-24 17:17:10 org.apache.catalina.core.AprLifecycleListener initializeSSL信息: OpenSSL successfully initialized with version OpenSSL 1.0.1q 3 Dec 20152018-5-24 17:17:10 org.apache.coyote.http11.Http11AprProtocol init信息: Initializing Coyote HTTP/1.1 on http-80802018-5-24 17:17:10 org.apache.coyote.ajp.AjpAprProtocol init信息: Initializing Coyote AJP/1.3 on ajp-80092018-5-24 17:17:10 org.apache.catalina.startup.Catalina load信息: Initialization processed in 766 ms2018-5-24 17:17:10 org.apache.catalina.core.StandardService start信息: Starting service Catalina2018-5-24 17:17:10 org.apache.catalina.core.StandardEngine start信息: Starting Servlet Engine: Apache Tomcat/6.0.452018-5-24 17:17:10 org.apache.catalina.startup.HostConfig deployDescriptor信息: Deploying configuration descriptor host-manager.xml2018-5-24 17:17:10 org.apache.catalina.startup.HostConfig deployDescriptor信息: Deploying configuration descriptor manager.xml2018-5-24 17:17:11 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory BookWork2018-5-24 17:17:11 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory docs2018-5-24 17:17:11 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory examples2018-5-24 17:17:11 org.apache.catalina.core.ApplicationContext log信息: ContextListener: contextInitialized()2018-5-24 17:17:11 org.apache.catalina.core.ApplicationContext log信息: SessionListener: contextInitialized()2018-5-24 17:17:11 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory MyFirstServletDemo2018-5-24 17:17:11 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory ROOT2018-5-24 17:17:11 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory s2018-5-24 17:17:11 org.apache.catalina.core.StandardContext filterStart严重: Exception starting filter EncodingFilterjava.lang.ClassNotFoundException: serlvet.EncodingFilter at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:272) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:119) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4102) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4760) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:803) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:780) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:583) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1080) at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1003) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:507) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1322) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:325) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1069) at org.apache.catalina.core.StandardHost.start(StandardHost.java:822) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463) at org.apache.catalina.core.StandardService.start(StandardService.java:525) at org.apache.catalina.core.StandardServer.start(StandardServer.java:759) at org.apache.catalina.startup.Catalina.start(Catalina.java:595) 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.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)2018-5-24 17:17:11 org.apache.catalina.core.StandardContext start严重: Error filterStart2018-5-24 17:17:11 org.apache.catalina.core.StandardContext start严重: Context [/s] startup failed due to previous errors2018-5-24 17:17:11 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory ServeltDemoByep2018-5-24 17:17:12 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory ServletGetInit2018-5-24 17:17:12 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory ServletLifeCycleDemo2018-5-24 17:17:12 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory ServletPathDirection2018-5-24 17:17:12 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory test2018-5-24 17:17:12 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory test.myeclipse.bak2018-5-24 17:17:12 org.apache.coyote.http11.Http11AprProtocol start信息: Starting Coyote HTTP/1.1 on http-80802018-5-24 17:17:12 org.apache.coyote.ajp.AjpAprProtocol start信息: Starting Coyote AJP/1.3 on ajp-80092018-5-24 17:17:12 org.apache.catalina.startup.Catalina start信息: Server startup in 2158 ms我知道是划线的那个地方出问题了，但是看不出是什么问题.....

Answer 1

严重: Exception starting filter EncodingFilter
java.lang.ClassNotFoundException: serlvet.EncodingFilter

错误如上，问题是没有找到serlvet.EncodingFilter 这个类呀，
是不是web.xml中写了这个Filter，但是没有引入相关jar包？