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With two JXTA based peers, each one behind its own NAT, is it possible for them to send direct messages to each other?
It is ok to use a rendezvous server for initial connection, but the real message with the payload needs to be sent directly from one peer to the other without a “gateway” on the internet.
I think Skype does that. I have heard about a trick using UDP instead of TCP. But does JXTA support that? Is it even possible with Java?
If both peers have a public IP address, then yes, it is possible. But since this is very rare, those peers will need a relay most of the time.
JXTA does not support direct connection between NAT-ed peers if they have private addresses.
It is possible to achieve this with Java when NATs are traversable, but it requires a sophisticated solution for TCP. For UDP, it is simpler.