The front page for Java.net has been down for a while today. The good news is that only the front page is down. Apparently, the infrastructure for the Java.net gaggle of servers is spread around a bit. CollabNet hosts and controls part of the infrastructure, some other machines are hosted by CollabNet but are under O'Reilly control, and then there's a machine hosted and controlled by Sun which serves some additional content.
So, you probably didn't care to know about the way that Java.net is structured, but this downtime today brings up the fact that for the most up to date information on the site, you should just bookmark today.java.net instead of using www.java.net. You'll get fresher content and, at least today while the machine that hosts the front page is down, you'll actually be able to access the site.