JavaRepeatServer
A smallish java server that repeats messages to specific clients
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JavaDoc is situated here
Otherwise, if you simply need to run it, grab a jar from the Release Page then run it using a simple java -jar ./nameOfJar.jar and it should work right out. There's not much more config you need, or that is possible at the moment. You might want to run -help to know the launch options, although there arn't many.