In total, seven patents are in question and Google's supposedly known about them for years, since the company hired former Sun Java engineers. Additionally, Oracle claims Google plainly "copied, prepared, published and distributed" copyrighted work without permission. Google hasn't reviewed the suit and thus cannot comment.
Anecdotally, it's amusing that Oracle claims Java "competes" with Android as an "operating system software platform" (page 3), but we're not sure how that is. If you have an explanation, we're all ears. You can read the full complaint after the break.