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I'm trying to make GUI for gameserver. But i dont know how to make all those logged messages which appears in console to appear in GUI textarea. Any ideas?

Exactly what is a GUI?

Graphical user interface

you mean like the same console, but with buttons of admin functionality?
or else i can't think of any use for it

which technology do you use? java swing?

check google..
http://www.comweb.nl/java/Console/Console.html