Well, I found a way to resolve my problem, I guess that's not the better solution, but it does works..
String item = request.getParameterValues("param"); // Hélène
item = URLEncoder.encode( model.getNameItem(), "ISO-8859-1" ); // H%C3%A9l%C3%A8ne
item = URLDecoder.decode( item, "UTF-8" ); // and finally : Hélène
If it can help anyone else, I'm glad to help :)
PS : Paul, I didn't answer you earlier but I already did those things. Thanks anyway for your help.
