Basically in any Unix type derivative such as Linux such (Ubuntu, RedHat, SuSe, etc.), as well as Mac OS X, all that you need to type this at the command line:

I remember there being a couple of commands in Windows which you could do this with, but it's been so long since I've used Windows on a regular basis I honestly don't remember how to do it. I do know you can use TCPView to accomplish the same thing, however.

I've been working on a sizable project at work that uses NIO under the hood, but luckily I'm using a 3rd party library which provides the network connectivity for me. It seems that NIO is very hard to implement correctly, but if you can, the performance advantages are definitely worth the effort. I'm only a few days away from starting to do some load testing on my work, so I'll be interested in seeing the performance improvement over the section of code I'm replacing which uses standard IO (not to mention the various synchronization and thread consumption problems I'll be fixing).

Being able to quickly handle a large number of concurrent connections is definitely a requirement for today's AJAX applications, and it's good to see an NIO based connector from someone other than Jetty.