I came to this question https://stackoverflow.com/questions/16732647/convert-rtf-file-to-pdf-file/16734426 that was closed as not constructive.
The reasoning for closing it are not 100% clear to me, but there is enough discussion about this topic (Help us make "Not Constructive" and "Not a Real Question" closures more effective).
The way I think about it, the question doesn't fall to the shoping list category since it is not asking for the best way to do what hi wants (RTF->PDF) but any way that conforms to his limitations (open+pure java). Maybe it is not a good fit for stackoverflow, but it looks like a good fit for programmers.stackexchange.
Would it be a good idea when closing a question from one site to migrate it to another if it's a perfect fit for it?