When processing a servlet request, the server uses the following order of precedence, first to last, to determine the request character encoding:
A hidden field in the form, specified by the form-hint-field attribute of the parameter-encoding element in the sun-web.xml file.
The character encoding set in the default-charset attribute of the parameter-encoding element in the sun-web.xml file.
The default, which is ISO-8859-1.
For details about the parameter-encoding element, see parameter-encoding.