http://bugs.winehq.org/show_bug.cgi?id=4860
--- Comment #3 from Dan Kegel dank@kegel.com 2008-03-18 13:13:21 --- Things were working fairly well with java until a few months ago, but recently there have been a bunch of java regressions; the plain old jre doesn't even install at the moment.
I don't think the difficulty of the "expose java plugin to firefox" issue has changed, offhand.