Hey there Sera,
Well this is a good place to start... I mean post up your question about your java problem and I am sure someone can help out here.... It definitely looks like this sub section of the forum looks abit empty and like there aren't many active users,but there are many that I am sure that can help with your java problem. It only looks inactive because alot of the questions that are asked, revolve around Visual Logic, MySQL (Which isn't a problem, but some of these questions are terribly structured and finding out what the user wants is a challenge and some of these question in this sub section aren't even about help needed, might be a question about promoting a game dev that needs members or something. So what I'm saying is I am sure your java question will be answered by a number of members on this forum....
But since you asked for a good site, I must recommend "StackOverflow
" very good help site with many experienced programmers and active users. It's a bit hard to navigate at first, but you almost certain to find an answer on your related question before you even make a post about it... Here is the site link:http://stackoverflow.com
Still recommend you post your question here, also helps with other people looking for a resolution to their problem maybe stumble upon GTG and get the Software Development forum a little bit more active.