Hi Tan,
Apologies for the delay in responding. The Sun's RFID product was years ago, and while Rio was part of that product I did not work on the product team, nor do I have the RFID product software or code. If you do I could possibly help, if you could share what you have.
Alternatively, there may be some on the list (doubtful but maybe) that did participate in Sun's RFIS product, maybe they could help.
One last thing, Rio has gone through quite a change from when it was used with Sun's RFIS product. For example, org.jini.rio namespace has been changed to org.rioproject.
HTH
Regards
Dennis