java work

Java portals for WAP ?

I'm trying to find what good java solutions (preferaby free) are out there to do a simple portal-like website. It would contain just a little text & visual content (so a CMS module with users and roles would come in handy) and some downloadable content (paying).

So far, Portlets seem to be all the rage. After (very) quickly browsing through the spec, it is unclear to me whether portlets have access to HTTP headers and the device's user agent in particular. This is critical for WAP applications.
Any provisions for content adaptation anywhere ?