rog,
I presume what you want to do is read an RSS feed and present the data in a JSP page... Yeah I can't see why not... but you'd be better of leaving it to an RSS reader app, or finding a webservice which presents the same or similar information...
Most (not all) RSS feeds are (currently)
a. non-performant.
b. up & down like a bull riders derrier.
c. notorious for giving 0 notice of changes, coz they (rightly) presume you use one of the forementioned generic readers.
I'd probably put in a background servlet (invoked on startup) and let it download and parse the XML, render some HTML from it, spit it out to a file, then sleep for an hour, and do it all over again.
But, I don't exactly have thirty years of experience at this whole j2ee thing, so there might be a better way.