Update (10/8/09): As of this afternoon (GMT) service has been mostly restored again.
Over the last few days java.net has been subject to denial-of-service attacks that have made the site very slow or temporarily inaccessible to users.
The java.net team is working with the highest priority to restore full service. As part of this effort the network infrastructure of the java.net systems will be reconfigured to allow the systems to resume normal operation. This means users in certain locations will not be able to access java.net temporarily.
The java.net team realizes the impact this has on users and sincerely apologizes for the problems and inconveniences caused.