If you know you'll definitely be attending JavaOne this year then you might as well take advantage of the $600 you can save by registering now under the Super Saver price. This discount will end on March 30th, 2012. (From March 31st the Early Bird discount kicks in - a saving of $400).
You can find out more information about registering for JavaOne 2012 at the registration page.
JavaOne 2012 is being held in San Francisco from September 30th to October 4th, 2012. Have a look at the official JavaOne website for more info or follow the news on Twitter: @javaoneconf and Facebook.