resty gwt - resource with query

gistfile1.java

Resource resource = new Resource(GWT.getModuleBaseURL(), new HashMap<String, String>());
        resource = resource.addQueryParam("includeparam", "false");
        try
        {
            resource.get().send( new RequestCallback() {
                
                @Override
                public void onResponseReceived( Request request, Response response )
                {
                    // TODO Auto-generated method stub
                    
                }
                
                @Override
                public void onError( Request request, Throwable exception )
                {
                    // TODO Auto-generated method stub
                    
                }
            } );
        }
        catch (RequestException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }