Project Kenai, however, will be discontinued for public use. Oracle will continue to use it internally and look for ways that our customers can take advantage of it. The timeline for users to migrate their data and projects off of Kenai will be posted at kenai.com. Please see the FAQ there for more details when available.

via Sun and Oracle: Overview and Frequently Asked Questions for the Developer Community.

Update - According to Project Kenai Blog , all the projects hosted on Kenai will be moved to java.net.