jdbc driver in solaris

Hi,
My server is sun solaris and database is oracle8i. I have jdk1.1.1. I set the classpath to be classpath=/orahome1/jdbc/lib/classes111.zip same as they have given in the readme.txt which come with the oracle. and i am using Jrun server for java. i am trying the driver and url to be
like this,.
Driver: oracle.jdbc.driver.oracledriver
url : "jdbc:oracle:thin:@localhost:1521:main"
when i try this then i am getting an error of
"No valid jdbc driver is specified".
How to find whether i have that jdbc driver?
just to speicify in the classpath , is that enough?
please help me .. i am desparate.or , do I need to upload my oracle and sdk to 1.2?
thanks in advance.
Lalitha