This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Creating a PDF and displaying it are two different problems. For the creating part, a library like iText can indeed help (make sure you read its license, so that you don't end up having to distribute your source code).