"As a result, we are able to support features in Fortress such as transactions, specification of locality, and implicit parallel computation, as integral features built into the core of the language."

"Moreover, Fortress has been designed with the intent that it be a ``growable'' language, gracefully supporting the addition of future language features. In fact, much of the Fortress language itself (even the definition of arrays and other basic types) is encoded in libraries atop a relatively small core language."

I haven't looked at the details of Fortress yet, but I don't read 'Java' in the above quotes.