There are many things I like about Jini/Javaspaces, but as I wrote over on Dan Creswell's blog recently, the documentation...
...needs some work...Especially for software that's been around for the better part of a decade. Do you want more Jini adoption? Get better documentation for it.
Hopefully the long time participants understand just how bad it is. It is discouragingly bad.
I hope to help. I currently need to build software for enterprise Java programmers, and this is some of the best stuff going.