proxool 遇到的问题

我用的是 tomcat + Myeclipse + mssqlserver2000今天第一次用了 proxool 技术在tomcat下的webapps下的web应用程序的 web-info的lib里添加了 proxool.jar在web-info 下添加了 proxool.xml
内容如下：<?xml version="1.0" encoding="UTF-8"?>
<something-else-entirely>
  <proxool>
    <alias>Develop</alias>
    <driver-url>jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=vsstock</driver-url>
    <driver-class>com.microsoft.jdbc.sqlserver.SQLServerDriver</driver-class>
    <driver-properties>
      <property name="user" value="sa"/>
      <property name="password" value="aaa"/>
    </driver-properties>
    <maximum-connection-count>500</maximum-connection-count>
    <house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>
  </proxool>
 
</something-else-entirely>在web.xml也做了更改 如下：---------------------------------------<?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">

<servlet>
     <servlet-name>proxoolServletConfigurator</servlet-name>
 <servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>
     <init-param>
       <param-name>xmlFile</param-name>
       <param-value>WEB-INF/proxool.xml</param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
   </servlet>
<!-- proxool提供的管理监控工具，可查看当前数据库连接情况。如果运行不成功，请删除本行 -->
   <servlet>
    <servlet-name>Admin</servlet-name>
      <servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class>
   </servlet>
   <servlet-mapping>
    <servlet-name>Admin</servlet-name>
    <url-pattern>/admin</url-pattern>
   </servlet-mapping></web-app>在应用程序里 做了如下操作----------------------------
Class.forName("org.logicalcobwebs.proxool.ProxoolDriver");
Connection conn = DriverManager.getConnection("proxool.Develop");可为什么总是报错呢，说找不到驱动，如下 ------------------------------java.lang.ClassNotFoundException: org.logicalcobwebs.proxool.ProxoolDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at test.Test.main(Test.java:13)
看网上人们用的都很顺利啊请教了