Java UDP hole punching example - connecting through firewall?

This example is in C#, not in Java, but the concepts of NAT traversal are language-agnostic.

Your question is really broad - I can't offer an example but the following links might help (specs, libraries, samples etc.).

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.