数据库连接出错:java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource

环境：tomcat4.1，j2sdk1.4.2_04，jakarta-struts-1.2.4
  工具：eclipse2.1.3
  系统：win2k，SQLserver200+SQL　Server　2000　For　JDBC　驱动程序
 
  struts-config.xml
 
  <data-sources>
  <data-source type="org.apache.commons.dbcp.BasicDataSource">
  <set-property property="driverClassName" value="com.microsoft.jdbc.sqlserver.SQLServerDriver" />
  <set-property property="url" value="jdbc:microsoft:sqlserver://localhost:1433;databasename=cims" />
  <set-property property="username" value="sa" />
  <set-property property="password" value="sa" />
  <set-property property="maxActive" value="10" />
  <set-property property="minActive" value="3" />
  <set-property property="maxWait" value="5000" />
  <set-property property="defaultAutoCommit" value="true" />
  <set-property property="defaultReadOnly" value="false" />
  </data-source>
  </data-sources>
 
  错误：
  <data-sources>
  <data-source type="org.apache.commons.dbcp.BasicDataSource">
  <set-property property="driverClassName" value="com.microsoft.jdbc.sqlserver.SQLServerDriver" />
  <set-property property="url" value="jdbc:microsoft:sqlserver://localhost:1433;databasename=cims" />
  <set-property property="username" value="sa" />
  <set-property property="password" value="sa" />
  <set-property property="maxActive" value="10" />
  <set-property property="minActive" value="3" />
  <set-property property="maxWait" value="5000" />
  <set-property property="defaultAutoCommit" value="true" />
  <set-property property="defaultReadOnly" value="false" />
  </data-source>
  </data-sources>
 
  2004/10/22 16:22:50 org.apache.commons.modeler.Registry loadRegistry
  情报: Loading registry information
  2004/10/22 16:22:50 org.apache.commons.modeler.Registry getRegistry
  情报: Creating new Registry instance
  2004/10/22 16:22:51 org.apache.commons.modeler.Registry getServer
  情报: Creating MBeanServer
  2004/10/22 16:22:52 org.apache.coyote.http11.Http11Protocol init
  情报: Coyote HTTP/1.1をポート8080で初期化
  Tomcat-Standalone を起动
  Apache Tomcat/4.1.24-LE-jdk14
  2004/10/22 16:22:54 org.apache.struts.action.ActionServlet initModuleDataSources
  致命的: org.apache.struts.action.DATA_SOURCE の初期化
  java.lang.ClassNotFoundException: org.apache.commons.dbcp.BasicDataSource
  at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1443)