Running under Tomcat

I have a simple prototype app which runs quite nicely under the bundled apps server.
I want to run it under my Tomcat 5.
I have loaded the two jars as described in http://developers.sun.com/prodtech/javatools/jscreator/reference/docs/help/deploy/howtodeploy/deploy_tomcat.html
So, my Library list shows JSTL 1.1 - standard.jar and JSTL 1.1 - jstl.jar
I also included the 'commons' jars which Tomcat requires - beanutils.jar, digester.jar, logging.jar and validator.jar
All of these 'additions' seems to have no detrimental effect on the built in app server of jsCreator.
The app works fine up till the time it attempts to establish connectivity to MySQL.
I have previously hand coded a similar working app under tomcat before I started using jsCreator.
Creating a context under tomcat involves creating a context.xml in the META-INF directory (which I have created as project/web/META-INF/context.xml
(which contradicts the Sun instructions of putting the context inside the Tomcat system config - Tomcat instructions say thee context should be as above)
Tomcat complains
2006-22-04 16:22:05,209 DEBUG Login - Loading auth data
2006-22-04 16:22:05,211 DEBUG Login - Context established - datasource is java:comp/env/jdbc/YourRosterDB
2006-22-04 16:22:05,226 DEBUG Login - Datasource established
2006-22-04 16:22:05,234 ERROR Login - LoginBean
org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
     at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:780)
     at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
     at com.YourRoster.Login.retrieveUserInfoAndLogin(Login.java:229)
     at com.YourRoster.Login.loginLoginButton_action(Login.java:376)
Would someone be able to assist me with this please?
Thanks in advance.
.

Make sure that in your server.xml file found in conf folder for Tomcat you have the following context completely filled out. Something like this:
<Context path="/gladiatorsgameserver">
<Resource auth="Container" description="Rave generated DataSource Reference" name="jdbc/Gladiators" type="javax.sql.DataSource" password="adminadmin" driverClassName="org.gjt.mm.mysql.Driver" maxIdle="2" maxWait="5000" username="root" url="jdbc:mysql://127.0.0.1:3306/gladiators" maxActive="100"/>
<WatchedResource>WEB-INF/web.xml</WatchedResource>
</Context>

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db Berater GmbH
http://www-db-berater.de

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