From the SOA Yahoo group, Greg Wonderly writes about Jini and Javaspaces...
One of the primary issues we have in the Jini community, at large, is that the Sun Jini team has commented in private that there are many different users of Jini which do not wish to have public recognition. Some developers have told me that Jini provided such an large, positive impact on the development and systems, for such a small investment, that they consider it a competative advantage that they don't want to talk about. I.e. it was so cheap and easy to use that their competitors would be able to be on par with them quickly.