HttpMessageConverter found for request type [com.sun.jersey.core.util.MultivaluedMapImpl]

Sorry for my really bad english. I'm trying to improve it but i hope it will not be too hard to understand me.

It's like 3 days i'm blocking by a problem for my android app. I try to use the android annotation for my posts request and after few errors like "unsupported media type", i finaly have this error :

org.springframework.web.client.RestClientException: Could not write request: no suitable HttpMessageConverter found for request type [com.sun.jersey.core.util.MultivaluedMapImpl]

I tried lot of things, but i don't find the error. I really need another eyes on my code.

Here my request :

import org.androidannotations.annotations.rest.Accept;
import org.androidannotations.annotations.rest.Post;
import org.androidannotations.annotations.rest.Rest;
import org.androidannotations.api.rest.MediaType;
import org.androidannotations.api.rest.RestClientErrorHandling;
import org.springframework.http.converter.FormHttpMessageConverter;

import javax.ws.rs.core.MultivaluedMap;

import worldline.rd.ebasket.model.massilia.customer.Customer;
import worldline.rd.ebasket.utils.Constants;

@Rest(rootUrl = Constants.HTTP.CUSTOMER_URL, converters = {FormHttpMessageConverter.class})
public interface ICustomerFormUrlEncoder extends RestClientErrorHandling {

@Post(value = "/customer/{identifier}/authentication/authenticate")
@Accept(MediaType.APPLICATION_JSON)
public Customer authenticate(MultivaluedMap data, String identifier);

The auto generation of this code is this :

@Override
    public Customer authenticate(MultivaluedMap data, String identifier) {
        try {
            HttpHeaders httpHeaders = new HttpHeaders();
            httpHeaders.setAccept(Collections.singletonList(MediaType.parseMediaType("application/json")));
            HttpEntity<MultivaluedMap> requestEntity = new HttpEntity<MultivaluedMap>(data, httpHeaders);
            HashMap<String, Object> urlVariables = new HashMap<String, Object>();
            urlVariables.put("identifier", identifier);
            return restTemplate.exchange(rootUrl.concat("/customer/{identifier}/authentication/authenticate"), HttpMethod.POST, requestEntity, Customer.class, urlVariables).getBody();
        } catch (NestedRuntimeException e) {
            if (restErrorHandler!= null) {
                restErrorHandler.onRestClientExceptionThrown(e);
                return null;
            } else {
                throw e;
            }
        }
    }

I'm calling this method in an async async task with the doInBackground method :

@Override
    protected Customer doInBackground(String... strings) {
        Customer test;
        String password = strings[1];
        MultivaluedMap<String, String> data = new MultivaluedMapImpl();
        data.add("password",password);
        //data.add("responseGroups","RG.Customer.ALL");
        Customer customer = mICustomerFormUrlEncoder.authenticate(data, strings[0]);
        test = customer;
        return test;
    }

I tried to use MultiValueMap instead of MultiValuedMap but it just give me and bad request. I also tried to change the converter but nothing better.

My request : http://ift.tt/1IdfyF6

I really hope someone can help me. If you need any other informations, i'll add them as fast i can.