I am playing with JSPWiki this Sunday. It's easy to install and easy to play with. I just dropped in to my local Caucho Resin's webapps folder, changed some jspwiki.properties settings and off it went. Oops. Not having any wiki page is no fun, so I expand sample wiki pages that came with the distribution into a folder designated as wiki file storage. At this point, it's ready for play.
Trying to understand the Wiki technology is like dissecting a Humming Bird: it's difficult to find the meat. In flight, it's wonderful. Take it apart to see what makes it tick and there is nothing there, just bits of feathers and bones put together using spider web and Harpy dust.