Mysterious distortion of JSON strings in Tomcat

I am facing an issue with JSON-String distortion when sending it from a JavaFX application to a Tomcat server. Some symbols are being replaced by strange square symbols:

https://example.com/image1.png

The conversion of JSON to pass correctly - verified by printing the JSON-String to the console in the JavaFX app after serialization. However, once transferred to the Tomcat server using DoPost method, the JSON-String gets distorted. I even tried transferring XML, but faced the same distortion.

Upon investigation, I discovered that the String sent by DoPost remains intact if its length is 7782 symbols or less. If one more symbol is added, squares start appearing:

https://example.com/image2.png

Both the JavaFX app and Tomcat server are running on a local machine using IntelliJ IDEA, so there doesn't seem to be a network problem.

javajsontomcatjavafx

Answer №1

Big shoutout to user Nick over at ru.stackoverflow.com:

He pinpointed the exact cause – the length of inputStream. It turns out that GZIP was not providing the correct value for the inputStream length to the Servlet. I made a switch from this block of code: `public String getInputString(HttpServletRequest req) { String receivedString = "";

    int len = req.getContentLength();
    byte[] input = new byte[len];

    try {
        ServletInputStream sin = req.getInputStream();
        int c = 0;
        int count = 0;
        while ((c = sin.read(input, count, (input.length - count))) > 0) {
            count += 1;
        }
        sin.close();
    } catch (IOException e) {

    }

    receivedString = new String(input);

    return receivedString;
}`[PasteBin-1][1]

to this: `public String getInputString(HttpServletRequest req) { String receivedString = "";

    try (BufferedReader reader = new BufferedReader(new InputStreamReader(req.getInputStream()))) {
        StringBuilder sb = new StringBuilder("");

        while (reader.ready()) {
            sb.append(reader.readLine());
        }

        if (sb.length() > 0) {
            receivedString = sb.toString();
        }

    } catch (IOException e) {

    }

    return receivedString;
}`[PasteBin-2][2]

And lo and behold, everything functioned as it should.

You can find the original question thread in Russian here: answer on ru.stackoverflow.com

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