Ask HN: What problems is prolog well suited for?

I am interested in exploring logic programming. I was wondering if someone could tell me, or shed some light on what problems prolog is good at solving, and how I would integrate it into say, a java application.

From what I have read on the subject, I understand prolog is not a general purpose language, but information has been sparse on where it is especially useful to use. I know some HN users have made use of the language in some of their own projects and I would love to hear why, how, and where.

Thanks guys.