RMI and jar problem

[Garry Kalra]

I am near submitting time and everything was working fine, till i get a strange problem. My server uses RMI was working fine. Now when i JAR the files inside server.jar, it is unable to find RMIRegistry, while if i run the same code without jarring it, it runs fine.
This problem has recently come up, as before i used to jar the server and no problems were encountered. Pls guide me what to do. I'm in urgent need of some help.
Gaurav