HTTP Status 404 -The requested resource is not available.

.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)

at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)

at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4958)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5652)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)

at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)

at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

at java.util.concurrent.FutureTask.run(FutureTask.java:262)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at java.lang.Thread.run(Thread.java:744)

六月 01, 2017 10:27:17 下午 org.apache.catalina.core.StandardContext startInternal

嚴重: One or more Filters failed to start. Full details will be found in the appropriate container log file

六月 01, 2017 10:27:17 下午 org.apache.catalina.core.StandardContext startInternal

嚴重: Context [/sh] startup failed due to previous errors

六月 01, 2017 10:27:17 下午 org.apache.catalina.startup.HostConfig deployDirectory

信息: Deployment of web application directory F:\apache-tomcat-7.0.77\webapps\sh has finished in 391 ms

六月 01, 2017 10:27:17 下午 org.apache.coyote.AbstractProtocol start

信息: Starting ProtocolHandler ["http-bio-8080"]

六月 01, 2017 10:27:17 下午 org.apache.coyote.AbstractProtocol start

信息: Starting ProtocolHandler ["ajp-bio-8009"]

六月 01, 2017 10:27:17 下午 org.apache.catalina.startup.Catalina start

信息: Server startup in 28335 ms

tomcat啟動沒有問題，我試過別的項目也能打開，跟著老師一步一步敲的代碼，這個打不開，不知道為什么，請問老師這個錯誤在哪？