Spring Boot multipartfile always null

Question

I am using Spring Boot version = \'1.4.0.RC1\' with Spring Boot Stormpath 1.0.2.

I am trying to use multipart file upload but the MultipartFile is always null in the con

Answer 1

I found out that the problem was the way I was building my request with Retrofit.

Spring's multipart resolver requires the filename for the file to be present in content-disposition field of the part. Without this, it doesn't add the file into the multipart request.

According to the info found here: https://futurestud.io/blog/retrofit-2-how-to-upload-files-to-server, my API interface should be:

@Multipart
@POST("users/{username}/profilePhoto")
Call uploadProfilePhoto(@Path("username") String username,
                              @Part MultipartBody.Part profilePhoto);

And then when making the call in my test:

// Given
String usernamme = usernames[0];
Resource testImageResource = context.getResource("classpath:images/test_image.jpg");
File imageFile = testImageResource.getFile();
RequestBody requestFile = RequestBody.create(MediaType.parse("multipart/form-data"), imageFile);
MultipartBody.Part filePart = MultipartBody.Part.createFormData("file", imageFile.getName(), requestFile);

// When
Response response = testApi.uploadProfilePhoto(usernamme, filePart).execute();