Hi Anudeep,
"No data available' simply means that the applet is not getting any data to display. The reason for this could be anything. Either there was a problem is calling underlying query, or the underlying query has some error, or the data could not be returned to the applet...the list goes on.
You can get to the root cause if you examine the java console. you will see an exception while running java applets. You can also add 'Trace' and 'Debug' parameters to the applet to get further information.
Regards,
Anushree