I am attempting to run a couple of Struts-based applications on JBoss 3.0, but am getting the following error. Both use Microsoft's JDBC driver to connect to MS SQL Server 2000. Does anyone know how to resolve it?

Here is the error:

13:09:47,046 ERROR [ActionServlet] Initializing application data source org.apache.struts.action.DATA_SOURCE
java.lang.NoClassDefFoundError: org/apache/commons/pool/impl/GenericObjectPool