This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
This question gets asked on a regular basis; here's a recent discussion. The short story is that long ago, when JavaRanch was first launched, there was no Java forum solution available at all. In the intervening years, several have appeared, but none have the feature set we need. We're in the process of building one ourselves, based on one of the available open-source Java forums. Watch this space for news on our progress.