Can you see any other reason for the purchase? They're now talking about pushing the Sun hardware, but at the time of the buy they were very cool on the idea.
But how many enterprises worldwide have Oracle DB + Java middleware? Add Sun's hardware to that, plus the old BEA Weblogic and they have a complete middleware/backend stack to offer. Well, maybe take weblogic out of that after they introduced their moronic DB licensing model for it.
No, don't worry about Java - worry more about Solaris and MySQL 😎