<img/> doesn't renders an image

Question

Image persists to the foalder but doesn't distributes, as i understand, it's problem with path in tag <img/

main.html:

<form th:action="@{/main}" method="post" enctype="multipart/form-data">
        <div>
            <input type="text" name="text" placeholder="Введите текст сообщения...">
            <input type="text" name="tag" placeholder="Введите тег сообщения...">
        </div>

        <div>
            <input type="file" name="file">
            <input type="submit" value="Отправить">
        </div>

    </form>

    <th:block th:each="message : ${messages}">
        <div>
            <b th:text="${message.id}"></b>
            <span th:text="${message.text}"></span>
            <i th:text="${message.tag}"></i>
            <strong th:text="${message.authorName}"></strong>
            <div th:if="${message.filename}">
                <img th:src="@{/img/${message.filename}}">
            </div>
        </div>
    </th:block>

Controller:

@PostMapping("/main")
    public String add(
            @AuthenticationPrincipal UserDetails userDetails,
            @RequestParam String text,
            @RequestParam String tag,
            @RequestParam("file") MultipartFile file
            ) throws IOException {
        User user = userRepository.findByUsername(userDetails.getUsername());
        Message message = new Message(text, tag, user);

        if (file != null){
            File uploadDir = new File(uploadPath);
            if (!uploadDir.exists()){
                uploadDir.mkdir();
            }

            String uuidPath = UUID.randomUUID().toString();
            String resultFileName = uuidPath + "." + file.getOriginalFilename();

            file.transferTo(new File(uploadPath + "/" + resultFileName));

            message.setFilename(resultFileName);

        }
        messageRepository.save(message);
        return "redirect:/main";
    }

Configuration:

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/img/**")
                .addResourceLocations("file://" + uploadPath + "/");
    }

Properties:

upload.path=D:/Projects/Intellij IDEA/Web Applications/Spring/sweater/uploads