Wrong encoding content in JSON response

@RooWebScaffold(path = "tcmnnucleoses", formBackingObject = TcmnNucleos.class, create = false, update = false, delete = false, exposeJson=true)
@RequestMapping("/tcmnnucleoses")
@Controller
public class TcmnNucleosController {

    @RequestMapping(params = "find=ByProvincia", method = RequestMethod.GET) //, headers = "Accept=application/json")
    @ResponseBody
    public String jsonFindTcmnNucleosesByProvincia(
            @RequestParam("provincia") String provincia) {
 
        return TcmnNucleos.toJsonArray(TcmnNucleos
                .findTcmnNucleosesByProvincia(
                        TcmnProvincias.findTcmnProvincias(provincia))
                .getResultList());
    }

"Pruébañ"
"Quart"
"Mislata"
"Manresa"

$ wget -O - -S --header='Accept: application/json,application/javascript' 'http://localhost:8080/acuses/tcmnnucleoses/?provincia=1&find=ByProvincia'
--2011-05-11 15:50:15--  http://localhost:8080/acuses/tcmnnucleoses/?provincia=1&find=ByProvincia
Resolviendo localhost... ::1, 127.0.0.1
Conectando a localhost|::1|:8080... conectado.
Petición HTTP enviada, esperando respuesta... 
  HTTP/1.1 200 OK
  Server: Apache-Coyote/1.1
  Content-Type: application/json;charset=UTF-8
  Content-Length: 1854
  Date: Wed, 11 May 2011 13:50:16 GMT
  Connection: keep-alive
Longitud: 1854 (1,8K) [application/json]
Guardando en: «STDOUT»
[{...:"Pru�ba�","dnuclc":null,...}]

  <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class&gt;org.springframework.web.filter.CharacterEncodingFilter</filter-class&gt;
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    
    
    
    <filter>
        <filter-name>HttpMethodFilter</filter-name>
        <filter-class&gt;org.springframework.web.filter.HiddenHttpMethodFilter</filter-class&gt;
    </filter>
    ....
    ....

   <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    ....
    ....