How are you outputing this data?
Velocity, JSP and others "template processors" allow you to specify
the character set, make sure it's set for a compatible one (usually
ISO-8859-1).
You can set the LC_ALL environment variable to pt_BR.ISO8859-1 (of
course you can switch pt_BR for your locale code) and then start your
AS.
(for me this was the solution, setting all character set processing
options on Webwork and Velocity was not enough).
Regards,
Samuel