java.net.UnknownHostException cannot be cast to retrofit2.adapter.rxjava.HttpException with RxJava

Question

I am getting this error in my logs:

Caused by java.lang.ClassCastException: java.net.UnknownHostException cannot be cast to retrofit2.adapter.rxjava.HttpException

and thats my onError method. The error is probably caused when the device has no connection.

  @Override
        public void onError(Throwable e) {
            assert e != null;
            Timber.d(e);
            HttpException exception = (HttpException) e;
            assert view != null;
            view.hideRefreshSpinner();
            if (exception.code() == HttpURLConnection.HTTP_BAD_REQUEST) {
                view.showSnackbarInvalidError();
            } else {
                view.showUnauthorizedError();
            }

        }

The host address is valid, it just I think when the call is made there is a network but no real connection. — Rene Gens
– Rene Gens, Commented Dec 25, 2016 at 9:41

Alexander Perfilyev · Accepted Answer · 2016-12-24 12:34:33Z

9

This is happening because you're receiving an instance of java.net.UnknownHostException and not retrofit2.adapter.rxjava.HttpException. If you look at the doc, it says:

Direct body (e.g., Observable) calls onNext with the deserialized body for 2XX responses and calls onError with HttpException for non-2XX responses and IOException for network errors.

Response wrapped body (e.g., Observable>) calls onNext with a Response object for all HTTP responses and calls onError with IOException for network errors

Result wrapped body (e.g., Observable>) calls onNext with a Result object for all HTTP responses and errors.

So you are receiving a network error.

Also see this

You can wrap your code like this:

@Override
public void onError(Throwable e) {
    assert e != null;
    Timber.d(e);
    if (e instanceof HttpException) {
        assert view != null;
        view.hideRefreshSpinner();
        if (((HttpException) e).code() == HttpURLConnection.HTTP_BAD_REQUEST) {
            view.showSnackbarInvalidError();
        } else {
            view.showUnauthorizedError();
        }
    }
}

edited Dec 24, 2016 at 12:34

answered Dec 24, 2016 at 10:19

Alexander Perfilyev

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1 Comment

Rene Gens Over a year ago

Thanks for the reply, I will try it and come back with results.

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