Charset encoding other than UTF-8 (as ISO-8859-1) not working

Simple REST service like this :

HelloService.java

package demo.jaxrs.server;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

@Path("/helloservice/")
public class HelloService {

@GET
@Path("/hello")
@Produces("text/html;charset=ISO-8859-1")
public String sayHello()

{ return "Hello, my name is Félix Agnès"; }

}

When called (in my environnement : http://localhost:58010/geoservices/ws/TEST/helloservice/hello) produce :

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Date: Thu, 22 Apr 2010 13:44:18 GMT
Content-Type: text/html;charset=ISO-8859-1
Content-Length: 31

Hello, my name is Félix Agnès

Latin characters like "éèà" are encoded in UTF-8 !!!