Oracle could pull all resources dedicated to the development of Java. Burn the forest to get the Google tree.
Drastic and unrealistic, but Ellison doesn't like to lose.
Keep in mind this started because Google built their own Java implementation from scratch instead of working from the JDK. That said...
a) Java customers tend to also use Oracle DB and Solaris, two other big Oracle products. Revenge on Google can't be worth giving up owning the full stack.
b) Google (perhaps with IBM and Red Hat) would be absolutely delighted to pick up Java development were Oracle to stop working on it; quite the opposite of what Oracle would hope to accomplish.
