Multipart/form-data and boundary. Need help in streaming the data at server end - spring

Question

I have multipart/form-data request from client side which will upload multiple files. Each file would be a large file (more than 10MB in size). I want to receive each file individually and process it while remaining files are still getting received completely.
This is my request in rest console
URL : http://localhost:8080/multiUpload
Content-Type : multipart/form-data;boundary=myboundary
form-data : two attachments
This is my snippet of code to handle it.
#RequestMapping(value = "/multiUpload", method = RequestMethod.POST)
public #ResponseBody String handleMultiFileUpload(HttpServletRequest request)
throws IOException {
System.out.println("======Inside handleFileUpload======");
try {
MultipartStream multipartStream = new MultipartStream(
request.getInputStream(), "myboundary".getBytes(),
1024 * 1024, null);
boolean nextPart = multipartStream.skipPreamble();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
while (nextPart) {
System.out.println("inside while");
multipartStream.readBodyData(outputStream);
InputStream inputStream = new ByteArrayInputStream(
outputStream.toByteArray());
nextPart = multipartStream.readBoundary();
}
} catch (MultipartStream.MalformedStreamException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return "You successfully uploaded !";
}
The code is not entering into while loop. i.e skipPreamble is returning false. Am I doing anything wrong ??.