Cannot create JDBC driver of class '' for connect URL 'null'

Bonjour
je suis sur une application utilisant Tomcat 4.1
Mon probleme est que je ne peux pas me connecter à la base
J'ai toujours l'erreur
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
mon server.xml contient ceci

Code:

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<Context docBase="C:\Program Files\Apache Software Foundation\Tomcat 4.1\webapps\Cab" path="/Cab" reloadable="true" />
        <Ressource name="jdbc/CAB-DB" auth="Container" type="javax.sql.DataSource"/>
	  <ResourceParams name="jdbc/CAB-DB">
	   <parameter><name>factory</name><value>oracle.jdbc.pool.OracleDataSourceFactory</value></parameter>
           <parameter><name>maxWait</name><value>5000</value></parameter>
           <parameter><name>maxActive</name><value>4</value></parameter>
           <parameter><name>maxIdle</name><value>2</value></parameter>
           <parameter><name>user</name><value>cab</value></parameter>
	   <parameter><name>password</name><value>cab</value></parameter>
	   <parameter><name>driverClassName</name><value>oracle.jdbc.pool.OracleConnectionPoolDataSource</value></parameter>
	   <parameter><name>url</name><value>jdbc:oracle:thin:@SERVER:1521:CABS</value></parameter>
   	</ResourceParams> 
   	</Context>

Quelqu'un a une idéee svp ?