急问!!!!!!!!!!!!!!!!

在配置Struts1.1数据源的时候出现了一个怪问题,请大家帮助看一下我的数据源在Struts-config.xml配置如下:
<data-sources>
    <data-source key="MySql">
      <set-property property="driverClassName"
       value="com.mysql.jdbc.Driver"/>
      <set-property property="url"
       value="jdbc:mysql://localhost:3306/managingsystem"/>
      <set-property property="username"   value="root"/>
      <set-property property="password"  value="kevinfield"/>
      <set-property property="maxActive" value="50"/>
      <set-property property="maxWait" value="1500"/>
      <set-property property="defaultAutoCommit" value="false"/>
      <set-property property="defaultReadOnly" value="false"/>
    </data-source>
  </data-sources>我在Action中调用的代码如下:
DataSource dataSource=this.getDataSource(servletRequest,"MySql");
Connection connection=dataSource.getConnection();但是在运行到相关获取数据源连接的Action的时候却发生如下异常:
javax.servlet.ServletException: Servlet.init() for servlet action threw exceptionjavax.servlet.ServletException: Servlet.init() for servlet action threw exception at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1071) at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:687) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:144) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) at java.lang.Thread.run(Thread.java:595)JBuilder2005提示的具体异常信息如下:
HTTP Status 500 - type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: Servlet.init() for servlet action threw exception
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
 org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
 org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
 org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
 java.lang.Thread.run(Thread.java:595)
root cause java.lang.NoClassDefFoundError: org/apache/struts/legacy/GenericDataSource
 java.lang.ClassLoader.defineClass1(Native Method)
 java.lang.ClassLoader.defineClass(ClassLoader.java:605)
 java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
 org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1634)
 org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:860)
 org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1307)
 org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1189)
 org.apache.struts.util.RequestUtils.applicationClass(RequestUtils.java:207)
 org.apache.struts.util.RequestUtils.applicationInstance(RequestUtils.java:231)
 org.apache.struts.action.ActionServlet.initModuleDataSources(ActionServlet.java:1081)
 org.apache.struts.action.ActionServlet.init(ActionServlet.java:472)
 javax.servlet.GenericServlet.init(GenericServlet.java:211)
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
 org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
 org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
 org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
 java.lang.Thread.run(Thread.java:595)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.Apache Tomcat/5.0.27初用Struts,不知道除了在Struts-config.xml中配置之外,是不是还要在Tomcat 5.0(我用的服务器)下面配置什么东西吗? 请大家帮忙看一下