From what I remember it depends on the type of java driveby (if it is a driveby - it probably is though). Some require a user to click/ download, others launch automatically. Something to do with buffer overflow I remember.
It's not hard to set these up. Anyone can learn how to set one up within a day. It's just about having low enough morals to do it.
Any readings you would recommend to lower ones morals to said level? jk
Ill run an in browser test on everyones pc. If any viruses pop up, please paypal Ice $3.50 for the WIA fund for virus removal.