Most of Javaranch actually does use J2EE technology. If you would ever venture out of the forums and realize there is a lot more to Javaranch you might notice the .jsp extensions. The UBB software that was purchased for the Forums uses CGI. At the time, I think that there weren't any J2EE BB Solutions readily available or at least that offered the features needed. Several attempts have been made to update the UBB software including the testing of JIVE which does use J2EE. However, the cost of upgrading and the time and trouble has overidded the need to do so.
Funny, but when I tried to respond I kept getting 503 - Service Not Available. Eugene, UBB is a memory pig which is why we don't allow multi-forum search. Anyway, writing a Java forum is not a trivial exercise. Since we all have real lives (and in many cases real families that require part of our time) we simply don't have the time to write a full-featured Java forum. The only Java forum out there is called Jive. Jive is pretty good but it does not have all the features of UBB and requires a lot of time to customize. We have a custom version that we have been testing but the problem is how do we convert several hundred thousand posts from UBB to Jive?