If its launched from a web page and you're using oracle's example JNLP servlet(found in the J2EE SDK) to handle JNLP files, you should just need to specify:
codebase="$$codebase" href="$$name"
The $$ definitions automatically get exported as the requested JNLP file URI. (Beware of transparent hostname rewrite proxies though, or they may need to be tweaked to convert the names properly within the contents of the response).
I've never done JWS on Glassfish, so they may do things a little differently than the JEE stock example app.
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