Howdy, Mura!
No need to worry. Only the name of your "executable" .jar file should be provided to you in the assignment. The name of the final .jar file is provided to you only when you're about to submit it, in the
http://certmanager.net/sun_assignment site.
Also, send an email to
who2contact@sun.com asking for rights to upload it, because it's likely that if you try to upload your file now, you'll get a message saying that you don't have the rights to upload it.
Cheers, Roberto Perillo
SCJP, SCWCD, SCJD, SCBCD