Hi Asheet,
First of all go to your default.properties file in your config folder under your j2sdkee1.2.1 and put the statement in rem where
you are connecting with the cloudscape , i.e
#jdbc.datasources=jdbc/Cloudscape|jdbc:cloudscape:rmi:CloudscapeDB;create=true
and then instead of this write the following statement
jdbc.datasources=jdbc/sql|jdbc

dbc:<write the user dsn name here in which you create a database in which you want your tables to be stored>;create=true
now save this file an start your j2ee server again.
While deploying your example inthe codede refrence name give jdbc/databasename and the jndi name as jdbc/sql and the other jndi name give it what you are giving in your lookup call in the client.
if you are not able to get through it. mail me back again , i'll send you the small coded example as an attachment. send me your personal mail id as sending attachment is not possible here.
Hope it works for you