Controller
@Log4j2
public class UploadController {

    @Autowired
    private UploadService uploadService;

    @RequestMapping("/uploadForm.html")
    public String uploadForm()
    {
        return "uploadForm";
    }

    @PostMapping("/uploadForm.html")
    public String handleFileUpload(@RequestParam("file") MultipartFile file, Model model) {
        try {
            uploadService.store(file);
            model.addAttribute("message", "You successfully uploaded " + file.getOriginalFilename() + "!");
        } catch (Exception e) {
            model.addAttribute("message", "FAIL to upload " + file.getOriginalFilename() + "!");
        }
        return "uploadForm";
    }

}