Class Cast exception

[learnyst]

• please provide the version of installed library and RN project.
  React native: 0.60.4
  rnFetchBlob: 0.11.2

• a sample code snippet/repository is very helpful to spotting the problem.
  We are not able to reproduce crash. Many of app users are facing issue.

rnFetchBlob is crashing with the below exception. We have got this exception in bugsnag

java.lang.ClassCastException okhttp3.internal.http.RealResponseBody cannot be cast to com.RNFetchBlob.Response.RNFetchBlobFileResp
RNFetchBlobReq.java:544 com.RNFetchBlob.RNFetchBlobReq.done
RNFetchBlobReq.java:67 com.RNFetchBlob.RNFetchBlobReq.access$100
RNFetchBlobReq.java:445 com.RNFetchBlob.RNFetchBlobReq$3.onResponse
RealCall.java:174 okhttp3.RealCall$AsyncCall.execute
NamedRunnable.java:32 okhttp3.internal.NamedRunnable.run
ThreadPoolExecutor.java:1113 java.util.concurrent.ThreadPoolExecutor.runWorker
ThreadPoolExecutor.java:588 java.util.concurrent.ThreadPoolExecutor$Worker.run
Thread.java:818 java.lang.Thread.run

[z384647062]

Change RNFetchBlob.fs.dirs.MusicDir to RNFetchBlob.fs.dirs.DocumentDir in option path of RNFetchBlob.config helps me solve the problem

[oleksandr-dziuban]

Change RNFetchBlob.fs.dirs.MusicDir to RNFetchBlob.fs.dirs.DocumentDir in option path of RNFetchBlob.config helps me solve the problem

@z384647062 I have same issue, but don't use any RNFetchBlob.fs.dirs.MusicDir in app.

I use RNFetchBlob.fs.dirs.DocumentDir everywhere.
Inеeresting that this error is only throws on non-clean Android. On Native Android (simulator or device) everything is OK. On Xiaomi, for example I see this error in MiUI

[oleksandr-dziuban]

Question to maintainers, Is it possible to review this issue please?

[oleksandr-dziuban]

@Traviskn Hello, I have checked this issues in 0.10.16 and it is not reproducible!
Only the latest few versions throw this error for Android

[oleksandr-dziuban]

Any ideas guys?

[Sumit-Chakole]

Change RNFetchBlob.fs.dirs.MusicDir to RNFetchBlob.fs.dirs.DocumentDir in option path of RNFetchBlob.config helps me solve the problem

This worked in my case too :)

[brianinator]

Relates to recent PR #530 that is going to catch it and return back.

[olcayertas]

I am getting the same error on Mac OS X with Android simulator (API 29 Google Play):

let dir = Platform.OS === "ios" ? 
    RNFetchBlob.fs.dirs.DocumentDir : 
    RNFetchBlob.fs.dirs.DownloadDir;
console.log("Download location: " + dir);
let headers = { Authorization: "Bearer " + token };
let options = { fileCache: true, path : dir + '/file' };
RNFetchBlob.config(options).fetch("GET", url, headers)

Error:

java.lang.ClassCastException: okhttp3.internal.http.RealResponseBody
cannot be cast to com.RNFetchBlob.Response.RNFetchBlobFileResp
	at com.RNFetchBlob.RNFetchBlobReq.done(RNFetchBlobReq.java:594)
	at com.RNFetchBlob.RNFetchBlobReq.access$100(RNFetchBlobReq.java:72)
	at com.RNFetchBlob.RNFetchBlobReq$3.onResponse(RNFetchBlobReq.java:493)
	at okhttp3.RealCall$AsyncCall.execute(RealCall.java:206)
	at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:919)

Version: 0.12.0
React: 0.61.5

[nobady90]

same error in Xiaomi with android 9 and MIUI Global 11.3.4.
in practice it seems that it does not resolve the gallery and therefore does not open the downloaded file with: RNFetchBlob.android.actionViewIntent (res.path (), item.mimeType);

instead everything works normally for example with pdf ... any help?

[hadare1]

I have the same issue on Pixel 3 and,
where do I need to make this change?

Change RNFetchBlob.fs.dirs.MusicDir to RNFetchBlob.fs.dirs.DocumentDir in option path of RNFetchBlob.config helps me solve the problem

This worked in my case too :)

[funkyfourier]

I am having this issue too. If I catch the exception, like in PR #530, then it will just fail silently and not download and save the file.

I am trying to download lots of files at once. They are for the most part slippy map tiles, in other words tiny png files. I slice the list of files in portions, so I do for example 20 at a time with Promise.all. Then I will get maybe 3-4 ClassCastExceptions for about 800 files.

Noticeably, the ClassCastException is not thrown when I only do Promise.all with one promise at a time. If I do two or more, the exception almost certainly will be thrown during those 800 files.

So, to be clear, I have an array of promises, about 800 of them, like this:

const fetchFile = (fileMeta) => {
        return new Promise((resolve, reject) => {
            fetchBlobTask = RNFetchBlob.config({
                path: fileMeta.filename,
                fileCache: true,
            }).fetch(
                'GET', encodeURI(fileMeta.url)
            );
            fetchBlobTask.then((result) => {
                resolve(result);
            }).catch((error) => {
                reject(error);
            });
        });
}

I then do Promise.all on (for example) 20 of those at a time. On iOS this works without a hitch. If I do only one at a time, it works on both platforms, but is painfully slow.

This happens on the emulator, on a OnePlus 6 and on a Sony XZ1.

It is also worth mentioning that the previous version of the app, which was built with Cordova, also had a similar issue on Android.

[brianinator]

Although downgrading to 0.10.16 made this issue go away, I decided to stay on 0.12.0 and switched to use Android download manager. The config I used:

config.addAndroidDownloads = {
  useDownloadManager: true,
  notification: true,
  mediaScannable: false,
  path: /path/to/file
};

[oleksandr-dziuban]

@Traviskn Hello, any ideas how to fix this issue?
Possibly this PR breaks Android
https://github.com/joltup/rn-fetch-blob/pull/530/files

Can we revert it and publish new npm package?

[oleksandr-dziuban]

Is this library still maintained? Looks like no...