Running argoUML, fixing hostname

When attempting to run ArgoUML under my custom install of Debian Lenny, it died on startup with the following:
"ERROR: unable to get localhost information.
java.net.UnknownHostException (...)"

solution: check the output of the command hostname, add a line corresponding to that name to the file /etc/hosts

Anyway, it might be a great piece of software, but I didn't have much luck with the functionality I needed. Namely, my simple collaboration diagram got its indexes all mixed up.

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