If you have to use a Java wiki, XWiki seems like you just run an exe to install it. Seems simple enough for me.
If you don't have to use Java, may I suggest an alternate path? I would just install
WAMP as the server software. This will give you an Apache webserver with PHP and mySQL. Then I would use
MediaWiki. If it is good enough for Wikipedia, it should be good enough for me!