在运行JSP程序时出现404错误，且在日志里也有很多严重提示，求大神帮忙看看是怎么回事？

Question

目测这些严重的failed都不是重点....
贴出你的服务配置和访问路径吧...

Answer 1

这是web.xml的内容，其中的<welcom-file-list>是我后来加上去的，还是不管用
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>modifycode</filter-name>
<filter-class>com.wsy.Filter.ModifyCode</filter-class>
<init-param>
<param-name>code</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>modifycode</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
<dispatcher>ERROR</dispatcher>
</filter-mapping>

<resource-ref>
    <description>SQL server text app</description>
    <res-ref-name>jdbc/ConnectionPool</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

<!-- 使用Proxool配置连接池 -->
<servlet>
   <servlet-name>ServletConfigurator</servlet-name>
   <servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>
  
   <init-param>
     <param-name>propertyFile</param-name>
     <param-value>WEB-INF/classes/Proxool.properties</param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
    </servlet>
    
    <servlet>
   <servlet-name>Admin</servlet-name>
   <servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class>
    </servlet> <welcome-file-list>
<welcome-file>index.jsp</welcome-file>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
</welcome-file-list>
    <servlet-mapping>
   <servlet-name>Admin</servlet-name>
   <url-pattern>/Admin</url-pattern>
    </servlet-mapping>

</web-app>

Answer 2

@zy353003874
错误信息是这样的：
2014-12-25 10:53:31 org.apache.catalina.core.ContainerBase addChildInternal
严重: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NoClassDefFoundError: Lorg/apache/commons/logging/Log;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
at java.lang.Class.getDeclaredFields(Class.java:1743)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:270)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:139)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:65)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:415)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:892)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5380)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 11 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.Log
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 25 more
2014-12-25 10:53:31 org.apache.catalina.startup.HostConfig deployDirectory
严重: Error deploying web application directory D:\Tomcat\Tomcat 7.0\webapps\ROOT
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
2014-12-25 10:53:31 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory D:\Tomcat\Tomcat 7.0\webapps\ROOT has finished in 1,030 ms
2014-12-25 10:53:31 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory D:\Tomcat\Tomcat 7.0\webapps\ROOT.myeclipse.bak
2014-12-25 10:53:31 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory D:\Tomcat\Tomcat 7.0\webapps\ROOT.myeclipse.bak has finished in 161 ms
2014-12-25 10:53:31 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-bio-8080"]
2014-12-25 10:53:31 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-bio-8009"]
2014-12-25 10:53:31 org.apache.catalina.startup.Catalina start
信息: Server startup in 3048 ms
然后我把下图的context-root后面的改成/WebRoot/之后就不会报错了，但还是会出现404错误