Why has JXTA been abandoned? Any alternatives out there?

Question

P2p/Grid Computing seem like a promising concepts. JXTA looks like the only all in one framework for it. Is there a reason this field is so sparsely pursued?

Answer 1

I think it's for the same reasons that RMI, CORBA, and Jini aren't much in favor: complex and closed.

Simple and open win most of the time.

It might have had something to do with all-Java clients or licensing fees or something else.

It could be competition. MPI is a widely accepted messaging standard for computing. Hadoop is getting a lot of traction.

UPDATE: The answer that was accepted discusses why people may or may not choose to participate in JXTA. I think my answer has more to do with user adoption, which is different. Mine go back to the origins of JXTA, not the details of releases 2.6 and 2.7.