Android Response: java.nio.charset.UnsupportedCharsetException: utf8mb4

Question

I got this error:

java.nio.charset.UnsupportedCharsetException: utf8mb4

And I haven't found any solutions yet.

This says that there's no point to solve this problem, as long as, I can't I change the server side.

How can I handle this charset?

This charset is just utf8 which some idiot decided to call utf8mb4 instead in whatever context you're dealing with it. You can safely treat the charset as flat-out utf8. — kumesana, Feb 13 '19 at 17:03

Igor Romcy · Answer 1 · 2019-02-13T17:27:03.700

0

Try to update your database or run:

ALTER DATABASE yourdatabasename CHARACTER SET utf8 COLLATE utf8_unicode_ci

If you can't change nothing on your backend service, try to change your charset configuration on your request like here:

How to suppress Charset being automatically added to Content-Type in okhttp

edited Feb 13 '19 at 17:27

answered Feb 13 '19 at 17:14

Igor Romcy

336
4
7

I can't change the server. And I guess the server needs utf8mb4. – c-an Feb 13 '19 at 17:15
are you using a cloud service? Is it possible to raise this problem as a dependency? give us more details about ur backend – Igor Romcy Feb 13 '19 at 17:18
I don't know about the backend. I am working on frontend. And I just got that format. – c-an Feb 13 '19 at 17:18
I don't know how you doing your request but probably you may have to change something like this: https://stackoverflow.com/questions/25560601/how-to-suppress-charset-being-automatically-added-to-content-type-in-okhttp – Igor Romcy Feb 13 '19 at 17:22
Thanks. But I don't know how to use them... Can you give me some examples? – c-an Feb 13 '19 at 17:48
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/188363/discussion-between-chanjung-kim-and-igor-maia-romcy). – c-an Feb 13 '19 at 18:25

score 0 · Accepted Answer · answered Feb 14 '19 at 03:27

Here's My solution,

This decodes the response.body() into UTF-8:

String responseResult = null;
try {
    Log.d(TAG, response.body().contentType()+"");
    BufferedSource source = response.body().source();
    source.request(Long.MAX_VALUE); // Buffer the entire body.
    Buffer buffer = source.buffer();
    responseResult = buffer.clone().readString(Charset.forName("UTF-8"));
    Log.d(TAG, "result: "+responseResult);
}catch(Exception e){
    // TODO
}

However, the bigger problem was the URL was incorrect. If it's wrong URL, you can get this error.

For instance,

The URL must be example.com/feed/4 but you sending the request to example.com/feed.

In my case, after decoding the body, I got 404 ERROR. And then, realized the URL was wrong. So, I fixed and It worked fine!

The decode might not convert properly, for example, emojis. Then, try it without converting the body. It will work.

Android Response: java.nio.charset.UnsupportedCharsetException: utf8mb4

2 Answers2