As for version 1.1.1 the Jakarta Commons-Validator is not accepting german "umlaute" as parts of valid domain names like müller.de or münchen.de
Is this a known issue in validator or might this be a setting in Struts?
Valid domain names must contain only the characters a-z, A-Z, 0-9, "." and "-". They must start with a letter and end with
a letter or digit. The "." symbol is used exclusively to seperate subdomains (see RFC 1035 section 2.3.1 <http://www.ietf.org/rfc/rfc1035.txt>).
To support internationalised domain names (IDN), both the client and the server must be punycode aware. Punycode is a fairly new standards proposal (rfc3492) that encodes non-ascii characters into an ascii string, prefixed with "xn--". For instance, müller.de is encoded as xn--mller-kva.de.
<http://www.faqs.org/rfcs/rfc3492.html> <http://www.afilias.info/cgi-bin/convert_punycode.cgi>
Commons-Validator would need to be made Punycode-aware to achieve what you need, or alternatively, you could do the punycode translation in your own code, before passing the string to validator.
-- Michael
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