Send "List" from server to client

[Crease]

Hi,
I need pass a list from server to client, but I don´t know make it
I am using gwt 2.4 and java-sdk-1.7.1
some site I had seen use this annotation: @gwt.typeArgs(type object), but 
It doesn´t work me
I have put in the server this:
    /**
     * @gwt.typeArgs <server.ConceptoFormal>
     */
    public List<ConceptoFormal> getReticulo() {
        return reticulo;
    }

I have put in the client this:
    Async:
     void getReticulo(AsyncCallback<List<ConceptoFormal>> callback) throws 
IllegalArgumentException;
    Other:
    List<ConceptoFormal> getReticulo() throws IllegalArgumentException; 

I have put in the onModuleLoad this:

greetingService.getReticulo(new AsyncCallback <List<ConceptoFormal>>() {

                    public void onFailure(Throwable caught) {
                        muestraDatosBox.setText("getReticulo - Failure");
                        respuestaXML
                                .addStyleName("serverResponseLabelError");
                        respuestaXML.setHTML(SERVER_ERROR);
                        muestraDatosBox.center();
                        cerrarButton.setFocus(true);
                    }

                    public void onSuccess(List<ConceptoFormal> result) {
                        muestraDatosBox.setText("Vuelta de la llamada");
                        respuestaXML
                                .addStyleName("respuestaServidorCorrecta");
                        respuestaXML.setHTML("<br>el número de objetos que 
tiene la lista es: " + result.size());
                        muestraDatosBox.center();
                        cerrarButton.setFocus(true);
                    }
                    
                });

And also I have included in web.xml this:

...
<servlet>
    <servlet-name>getReticulo</servlet-name>
    <servlet-class>com.alberto.server.GreetingServiceImpl</servlet-class>
  </servlet>
...
  <servlet-mapping>
    <servlet-name>getReticulo</servlet-name>
    <url-pattern>/pruebacanvas/greet</url-pattern>
  </servlet-mapping>
...

thank you for your help

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