Senden Sie eine HashMap mit Jersey für REST-web-service

Bin ich mit Jersey für einen REST-webservice.
Ich möchte zum senden einer HashMap auf dem server, aber ich habe ein problem. Dieser code funktioniert gut, wenn ich parameter ändern der Methode zum String, aber mit einer HashMap, es funktioniert nicht :

    ClientConfig config = new DefaultClientConfig();
    config.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
    Client client = Client.create(config);

    URI uri = UriBuilder.fromUri("http://localhost:8081/serviceProxy_socle-01.00.00-SNAPSHOT/services/tableauDeBord/subventions").build();
    System.out.println(uri.toString());
    WebResource service = client.resource(uri);

    GenericType<TableauDeBordImpl<CoupsDPouceImpl>> informationsDossier = new GenericType<TableauDeBordImpl<CoupsDPouceImpl>>(){};


    HashMap<String, Object> params = new HashMap<String, Object>();
    params.put("rne", "0240984P");

    TableauDeBordImpl<CoupsDPouceImpl> content = service
    .accept(MediaType.APPLICATION_JSON)
    .entity(params, MediaType.APPLICATION_XML)
    .type(MediaType.APPLICATION_XML).post(informationsDossier);

Dies ist die Stacktrace :

Exception in thread "main" com.sun.jersey.api.client.ClientHandlerException: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class java.util.HashMap, and MIME media type, application/xml, was not found
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:148)
    at com.sun.jersey.api.client.Client.handle(Client.java:642)
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:613)
    at com.sun.jersey.api.client.WebResource.access$300(WebResource.java:74)
    at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:503)
    at fr.liberaccess.pool.tester.Tester.testCoupsDpouce(Tester.java:63)
    at fr.liberaccess.pool.tester.Tester.<init>(Tester.java:39)
    at fr.liberaccess.pool.tester.Tester.main(Tester.java:188)
Caused by: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class java.util.HashMap, and MIME media type, application/xml, was not found
    at com.sun.jersey.api.client.RequestWriter.writeRequestEntity(RequestWriter.java:299)
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:203)
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:146)
    ... 7 more
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