This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Would this tool also generate actual code? Or should it just point out the syntax errors? Generating code adds a bunch of complexity; creating ready-to-run executables even more so. If that is part of it, I'd estimate that you have no chance of finishing within the next 12 months. If not, you may be able to get something useful out within a couple of months.