You DON'T want to do this. The reference to JFC/Swing means that the
product you wish to install is assuming that the computer has a display,
and in the case of Linux, it must have XWindows. There are alternatives
(headless x-servers), but if you like your "vanilla box", I wouldn't
mess with it.
My guess is that you want an instant messenger server, and not an
instant messenger client. It looks like you are about to install the
client, which would be useless on your RaQ. There are a number of IM
servers that you can use on the RaQ, just check SourceForge.