eclipse 中使用servlet 显示404错误

我做了个很简单的servlet
web.xml 配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>homework</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
     <servlet-name>register</servlet-name>
     <servlet-class>func.RegisterMeg</servlet-class>
  </servlet>
  <servlet-mapping>
<servlet-name>register</servlet-name>
<url-pattern>/register/</url-pattern>
  </servlet-mapping>
</web-app>
tomcat报错
type Status reportmessage Servlet register is not available2011-11-28 17:17:08 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: C:\Program Files\Java\jre6\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;c:/program files/java/jdk1.5.0_05/jre/bin/client;c:/program files/java/jdk1.5.0_05/jre/bin;c:/program files/java/jdk1.5.0_05/jre/lib/i386;c:\oracle\product\10.2.0\client_1\bin;C:\Program Files\Autodesk\Maya8.5\bin;c:\program files\java\jdk1.5.0_05\jre\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Common Files\Autodesk Shared\;C:\MATLAB701\bin\win32;C:\Program Files\Microsoft SQL Server\80\Tools\BINN;C:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\Java\jdk1.5.0_05\bin;C:\Program Files\Microsoft Visual Studio\Common\Tools\WinNT;C:\Program Files\Microsoft Visual Studio\Common\MSDev98\Bin;C:\Program Files\Microsoft Visual Studio\Common\Tools;C:\Program Files\Microsoft Visual Studio\VC98\bin;.
2011-11-28 17:17:08 org.apache.tomcat.util.digester.SetPropertiesRule begin
警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:homework' did not find a matching property.
2011-11-28 17:17:08 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-bio-8080"]
2011-11-28 17:17:08 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-bio-8009"]
2011-11-28 17:17:08 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 494 ms
2011-11-28 17:17:08 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
2011-11-28 17:17:08 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.20
2011-11-28 17:17:09 org.apache.catalina.loader.WebappClassLoader validateJarFile
信息: validateJarFile(H:\jsp\worksapce\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\homework\WEB-INF\lib\servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
2011-11-28 17:17:09 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-bio-8080"]
2011-11-28 17:17:09 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-bio-8009"]
2011-11-28 17:17:09 org.apache.catalina.startup.Catalina start
信息: Server startup in 740 ms
2011-11-28 17:17:13 org.apache.catalina.core.ApplicationContext log
信息: Marking servlet register as unavailable
2011-11-28 17:17:13 org.apache.catalina.core.StandardWrapperValve invoke
严重: Allocate exception for servlet register
java.lang.ClassNotFoundException: func.RegisterMeg
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:415)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:397)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1099)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:836)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:300)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
2011-11-28 17:17:19 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet register is currently unavailable
2011-11-28 17:17:23 org.apache.catalina.core.StandardWrapperValve invoke
信息: Servlet register is currently unavailable