I need to convert .docx file content to HTML text in order to display in web ui.

I've used **Apache POI**'s **XWPFDocument** class but haven't been able to get any results yet; **getting empty string**. My code is based on [this sample](https://stackoverflow.com/q/9047044/282855). 

Here's also my code:

```
public JSONObject uploadDocxFile(MultipartFile multipartFile) throws Exception {
        InputStream inputStream = multipartFile.getInputStream();
        XWPFDocument wordDocument = new XWPFDocument(inputStream);

        WordToHtmlConverter wordToHtmlConverter = new WordToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());
        org.w3c.dom.Document htmlDocument = wordToHtmlConverter.getDocument();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        DOMSource domSource = new DOMSource(htmlDocument);
        StringWriter stringWriter = new StringWriter();

        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer serializer = tf.newTransformer();
        serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
        serializer.setOutputProperty(OutputKeys.INDENT, "yes");
        serializer.setOutputProperty(OutputKeys.METHOD, "html");
        serializer.transform(domSource, new StreamResult(stringWriter));
        out.close();

        String result = new String(out.toByteArray());
        String htmlText = result;

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("content", htmlText);
        jsonObject.put("success", true);
        return jsonObject;
    }

```