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I did a post-grad project using JavaSpaces and prolog to do automated refactoring in Java back in the late 90's. The JavaSpaces implementation was so terrible that it was hard to get anything done. Great idea, but poor execution in Java probably killed Jini and JavaSpaces (and any hope of it going mainstream).

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We used JavaSpaces/Jini in an EMRS system during the same period(and also tried GigaSpaces which was best impl) called Frontiers which was at some point used at many hospitals on both coasts.

It did make things very flexible as in we knew we could just start ripping pieces out of the system during testing to make sure every piece was completely autonomous and definitely redundant with data. Also had "agents" in self contained "hot reloadable" classes because we learned about the discarded classloader trick. Man, learned so much fun/crazy stuff at that job.

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