tomact5.5数据库连接池配置问题

系统在tomact5.0.28+oracle9i连接池以下代码配置没有问题,可是一转到tomact5.5下就不行,报这个错误:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
请高手指教,急,在线等!server.xml文件内容如下:<Server port="8005" shutdown="SHUTDOWN">
  <Listener className="org.apache.catalina.core.AprLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>  <!-- Global JNDI resources -->
  <GlobalNamingResources>    <!-- Test entry for demonstration purposes -->
    <Environment name="simpleValue" type="java.lang.Integer" value="30"/>    <Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
       description="User database that can be updated and saved"
           factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
          pathname="conf/tomcat-users.xml" />  </GlobalNamingResources>  <Service name="Catalina">   
    <Connector
port="8080"               maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />    <Connector port="8009" 
               enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />
      <Host name="localhost" appBase="webapps"
       unpackWARs="true" autoDeploy="true"
       xmlValidation="false" xmlNamespaceAware="false">       <Context docBase="G:\MyDss\dss_hq\dss" path="/boncdss" reloadable="fals">
<Resource name="default" auth="Container" type="javax.sql.DataSource"/> 
<ResourceParams name="default">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@192.168.0.3:1521:CTTEBAPV</value>
</parameter>
<parameter>
<name>username</name>
<value>dss</value>
</parameter>
<parameter>
<name>password</name>
<value>dss</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>100</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>100</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>300</value>
</parameter>
</ResourceParams>
</Context>
      </Host>    </Engine>  </Service></Server>