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 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 in Sun GlassFish Enterprise Server v2.1.1 Application Deployment Guide.