修改web.xml，添加servlet后页面无法显示

Question

我用MyEclipse编辑一个项目，原来的web.xml文件时这样的：
<?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">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
这样文件可以正常显示，后来由于要用servlet连接数据库，就在web.xml中添加了以下几句：
<servlet>
<servlet-name>lookRecord</servlet-name>
<servlet-class>servlet.HandleDatabase</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>lookRecord</servlet-name>
<url-pattern>/helpShowMember</url-pattern>
</servlet-mapping><servlet>
<servlet-name>modifyPassword</servlet-name>
<servlet-class>servlet.HandlePassword</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>modifyPassword</servlet-name>
<url-pattern>/helpModifyPassword</url-pattern>
</servlet-mapping>
然后就报错了，显示的页面是：
HTTP Status 404 - --------------------------------------------------------------------------------type Status reportmessage description The requested resource () is not available.
--------------------------------------------------------------------------------Apache Tomcat/6.0.20
前面可以显示的页面也都变成这样了，本人初学java EE，请各位指教

Answer 1

路径？路径不是应经设置在server.xml里了吗？都没改啊

Answer 2

没添加servlet的控制台输出信息：
2010-1-31 12:53:55 org.apache.tomcat.util.digester.SetPropertiesRule begin
警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'debug' to '0' did not find a matching property.
2010-1-31 12:53:55 org.apache.catalina.core.AprLifecycleListener init
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: E:\Eclipse worksoftware\bin;E:\Tomcat 6.0\bin
2010-1-31 12:53:55 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2010-1-31 12:53:55 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 973 ms
2010-1-31 12:53:55 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2010-1-31 12:53:55 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.20
2010-1-31 12:53:57 org.apache.tomcat.util.digester.Digester endElement
严重: End event threw exception
java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tomcat.util.IntrospectionUtils.callMethodN(IntrospectionUtils.java:956)
at org.apache.catalina.startup.CallMethodMultiRule.end(WebRuleSet.java:789)
at org.apache.tomcat.util.digester.Rule.end(Rule.java:229)
at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1140)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)
at org.apache.catalina.startup.ContextConfig.applicationWebConfig(ContextConfig.java:365)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1066)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4339)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name GetOldMess
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:2470)
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:2450)
... 43 more
2010-1-31 12:53:57 org.apache.catalina.startup.ContextConfig applicationWebConfig
严重: Parse error in application web.xml file at jndi:/localhost/web development/WEB-INF/web.xml
java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name GetOldMess
at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2808)
at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2834)
at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1143)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)
at org.apache.catalina.startup.ContextConfig.applicationWebConfig(ContextConfig.java:365)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1066)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4339)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2010-1-31 12:53:57 org.apache.catalina.startup.ContextConfig applicationWebConfig
严重: Occurred at line 62 column 19
2010-1-31 12:53:57 org.apache.catalina.startup.ContextConfig start
严重: Marking this application unavailable due to previous error(s)
2010-1-31 12:53:57 org.apache.catalina.core.StandardContext start
严重: Error getConfigured
2010-1-31 12:53:57 org.apache.catalina.core.StandardContext start
严重: Context [/web development] startup failed due to previous errors
2010-1-31 12:53:57 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2010-1-31 12:53:57 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2010-1-31 12:53:57 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/47  config=null
2010-1-31 12:53:57 org.apache.catalina.startup.Catalina start
信息: Server startup in 2123 ms

Answer 3

添加了servlet后的控制台输出信息：(好长，部分贴出来)
2010-1-31 12:59:02 org.apache.tomcat.util.digester.SetPropertiesRule begin
警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'debug' to '0' did not find a matching property.
2010-1-31 12:59:02 org.apache.catalina.core.AprLifecycleListener init
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: E:\Eclipse worksoftware\bin;E:\Tomcat 6.0\bin
2010-1-31 12:59:02 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2010-1-31 12:59:02 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 918 ms
2010-1-31 12:59:02 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2010-1-31 12:59:02 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/6.0.20
2010-1-31 12:59:02 org.apache.tomcat.util.digester.Digester endElement
严重: End event threw exception2010-1-31 12:59:02 org.apache.catalina.startup.ContextConfig applicationWebConfig
严重: Parse error in application web.xml file at jndi:/localhost/webroot/WEB-INF/web.xml2010-1-31 12:59:02 org.apache.catalina.startup.ContextConfig applicationWebConfig
严重: Occurred at line 57 column 19
2010-1-31 12:59:02 org.apache.catalina.startup.ContextConfig start
严重: Marking this application unavailable due to previous error(s)
2010-1-31 12:59:02 org.apache.catalina.core.StandardContext start
严重: Error getConfigured
2010-1-31 12:59:02 org.apache.catalina.core.StandardContext start
严重: Context [/webroot] startup failed due to previous errors
2010-1-31 12:59:03 org.apache.tomcat.util.digester.Digester endElement
严重: End event threw exception
java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tomcat.util.IntrospectionUtils.callMethodN(IntrospectionUtils.java:956)
at org.apache.catalina.startup.CallMethodMultiRule.end(WebRuleSet.java:789)
at org.apache.tomcat.util.digester.Rule.end(Rule.java:229)
at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1140)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)
at org.apache.catalina.startup.ContextConfig.applicationWebConfig(ContextConfig.java:365)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1066)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4339)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name GetOldMess
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:2470)
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:2450)
... 43 more
2010-1-31 12:59:03 org.apache.catalina.startup.ContextConfig applicationWebConfig
严重: Parse error in application web.xml file at jndi:/localhost/web development/WEB-INF/web.xml
java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name GetOldMess
at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2808)
at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2834)
at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1143)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1644)
at org.apache.catalina.startup.ContextConfig.applicationWebConfig(ContextConfig.java:365)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:1066)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:261)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4339)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2010-1-31 12:59:03 org.apache.catalina.startup.ContextConfig applicationWebConfig
严重: Occurred at line 62 column 19
2010-1-31 12:59:03 org.apache.catalina.startup.ContextConfig start
严重: Marking this application unavailable due to previous error(s)
2010-1-31 12:59:03 org.apache.catalina.core.StandardContext start
严重: Error getConfigured
2010-1-31 12:59:03 org.apache.catalina.core.StandardContext start
严重: Context [/web development] startup failed due to previous errors
2010-1-31 12:59:03 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2010-1-31 12:59:04 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2010-1-31 12:59:04 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/47  config=null
2010-1-31 12:59:04 org.apache.catalina.startup.Catalina start
信息: Server startup in 1962 ms

Answer 4

路径问题呗可以去根目录看一下。目录名称是否正确。。因为Eclipse部署有的时候也会出错。。

Answer 5

servlet> 
<servlet-name>lookRecord </servlet-name> 
<servlet-class>servlet.HandleDatabase </servlet-class> 
</servlet> 
<servlet-mapping> 
<servlet-name>lookRecord </servlet-name> 
<url-pattern>/helpShowMember </url-pattern> 
</servlet-mapping你的这些类 对吗？ 

Answer 6

servlet.HandlePassword 
这个是class哦  不是function

Answer 7

Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name GetOldMess 
坦白说我现在一看到控制台输出我就蛋疼..

Answer 8

IllegalArgumentException 非法参数
Servlet mapping specifies an unknown servlet name GetOldMess
找不到指定的servlet name GetOldMess
楼主再查查web.xml吧，GetOldMess这个name的配置

Answer 9

其实吧，这些类我都还没写好，只写了头两个类，不过先部署下，充其量也就是它搜索路径的结果是空的，不会影响到其他路径不为空的servlet吧，我在浏览器上输入的URL是之前可以正常显示的啊，现在弄得连单纯的欢迎页面index.jsp都出不来了

Answer 10

为什么要是web.xml里面配置这些信息啊，可能是你在web.xml里面遗漏了配置信息吧
警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'debug' to '0' did not find a matching property. 
也许要加上debug配置。

Answer 11

谢谢各位，路径问题，现在服务器正常启动了，而且也能显示网页了，不过我还有点疑问，起初我是在server.xml里加了这一句<Context path="/webroot" docBase="E:\workspace\web development\WebRoot" debug="0" reloadable="true" />（呵呵，好像有点画蛇添足，第一次玩MyEclipse，不知道工作间的项目MyEclipse已经建一份在tomcat根目录/webapps下面了），然后我把这句注释掉就可以了，可是在server.xml创建虚拟目录，之前敲http://127.0.0.1:8080/webroot/index.jsp都行的，为什么配置了web.xml反而出错了？

Answer 12

今天我也遇见了。也就是web.xml文件中的配置错了！

Answer 13

今天我也遇见了。也就是web.xml文件中的配置错了！