cannot resolve symbol error

I'm running a web app via tomcat, that the original coder has managed to
build using 1.4, but added a bundle of extra jar files to enable JDBC
with rowset.
I've copied all the extra files into a folder under the classpath, which
has partly resolved various issues, but I'm now staring at :

org.apache.jasper.JasperException: Unable to compile class for JSP

Generated servlet error:
H:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina
\localhost\raid\org\apache\jsp\registration\newclient_jsp.java:7: cannot
resolve symbol
symbol : class rowset
location: package sql
import javax.sql.rowset;
^
1 error

I know rowset is in rt.jar, as I can see it via winzip.

this is the classpath (in tomcat) I'm using (rt.jar is under \j2sdk1.4.2_
09\jre)
..;h:\Program Files\Apache Software Foundation\Tomcat 5.0\bin
\bootstrap.jar;H:\Program Files\Apache Software Foundation\Tomcat 5.0
\webapps\raid\WEB-INF\classes\raid;h:\Program Files\Apache Software
Foundation\Tomcat 5.0\common\lib;C:\Program Files\Java\j2sdk1.4.2_09\jre
\lib

the server classpath just points at the Microsoft jdbc jars

is there any significance in the import being all lowercase, and the
RowSet class file being #not# lowercase?
.