JDBCRealm Question

[Alan Halley]

Hi

I am getting strange error when I try to use JDCRealm. I running Tomcat 4 from within 
Forte.
The error is 

Catalina.start: LifecycleException:  Exception opening database connection:  
java.sql.SQLException: org.gjt.mm.mysql.Driver
LifecycleException:  Exception opening database connection:  java.sql.SQLException: 
org.gjt.mm.mysql.Driver
        at org.apache.catalina.realm.JDBCRealm.start(JDBCRealm.java:615)
I'm sure that my JDBCrealm is configured correctly. Here is the relevant section of 
the server.xml

      <Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
          driverName="org.gjt.mm.mysql.Driver"
        connectionURL="jdbc:mysql://localhost:3306/diamond?user=alan;password=xxxxxxx;"
       userTable="users" userNameCol="user_name" userCredCol="user_pass"
        userRoleTable="user_roles" roleNameCol="role_name"/>

Any help would be gratefully appreciated.
Alan Halley