Uploading files using REST and Java

I'm creating an application and need a way to upload xls / xlsx files, sending the front-end (Ajax) file to the backend (Java) so it can be manipulated.

Ajax code:

$("#formulario").submit(function () {
                var formData = new FormData(this);

                $.ajax({
                    url: url,
                    type: 'POST',
                    data: formData,
                    success: function (data, status, jqxhr) {
                        alert('sucesso');
                    },
                    error: function(){
                        alert('deu erro');
                    },
                    cache: false,
                    contentType: false,
                    processData: false,
                    xhr: function() {  
                        var myXhr = $.ajaxSettings.xhr();
                        if (myXhr.upload) { 
                            myXhr.upload.addEventListener('progress', function () {

                                alert('upando o arquivo');
                            }, false);
                        }
                    return myXhr;
                    }
                });
            });

The Ajax code is working perfectly, it executes and returns the code 200. However, I can not 'receive' the file in Java.

Java code:

@POST
@Path("/upload")
@Consumes("multipart/form-data")
public Response create(@MultipartForm FileUploadForm input){
    System.out.println("funcionou");
    //manipulo o arquivo
    return Response.ok;
}

I hope you can help me and guide me to make it work.

UPDATE

I made a change in ajax, and finally I was able to get JAVA to receive the request

$(document).ready(function () {
            $(function () {
                var form;
                $('#fileUpload').change(function (event) {
                    form = new FormData();
                    form.append('fileUpload', event.target.files[0]); // para apenas 1 arquivo
                    //var name = event.target.files[0].content.name; // para capturar o nome do arquivo com sua extenção
                });

                $('#btnEnviar').click(function () {
                    $.ajax({
                        url: 'http://localhost:8080/SferaCR/rest/importacao', // Url do lado server que vai receber o arquivo
                        data: form,
                        processData: false,
                        contentType: false,
                        type: 'POST',
                        success: function (data) {
                            alert('sucesso');
                            $('#fileUpload').val('');
                        },
                        error: function (){
                            alert('deu erro');
                            $('#fileUpload').val('');
                        }
                    });
                });
            });
        });

However, the problem now is that in java, you are getting the 'input' parameter as null. That is, the request goes, 'right', but the file is not sent.