How to upload file along with json meta data using rest api - file

Question

I have requirement to upload xlsx file on server along with some json data(both has to be done in one request). I was able to upload just file using multipart/form-data, but when I tried add JSON data to the same request, request is failing with org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream
exception. Below is my code.
Client side code
var method = 'POST';
$.ajax({
type: method,
url : "rest/file/upload",
transformRequest: function () {
var formData = new FormData();
formData.append("model", JSON.stringify(jsonData));
formData.append("file",document.getElementById("fileForm"));
return formData;
},
enctype : 'multipart/form-data',
processData : false,
contentType : false,
success: function (data) {},
error: function (data) {}
});
model is the JSON data & file is xlsx file which is to be uploaded.
Server Side Code
#POST
#Path("/upload")
#Consumes(MediaType.MULTIPART_FORM_DATA)
#Produces(MediaType.TEXT_PLAIN)
public Response uploadResumableISOFile(#Context HttpServletRequest request, #Context UriInfo uri,
#Context HttpHeaders headers, #Context HttpServletResponse response) throws IOException {
ServletFileUpload uploader = null;
try {
DiskFileItemFactory fileFactory = new DiskFileItemFactory();
uploader = new ServletFileUpload(fileFactory);
List<FileItem> fileItemsList = uploader.parseRequest(request);
Iterator<FileItem> fileItemsIterator = fileItemsList.iterator();
while (fileItemsIterator.hasNext()) {
FileItem fileItem = fileItemsIterator.next();
File file = File.createTempFile("TEMP_", ".xlsx");
fileItem.write(file);
System.out.print("File " + fileItem.getName() + " uploaded successfully.");
}
System.out.println("File uploaded to successfully...");
return Response.status(Response.Status.OK).build();
} catch (Exception e) {
System.out.println(e);
return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity("Failed to upload file.").build();
}
}
Please let me know if something is missing.