Crash Backendless in web Flutter 7.1.6

Ehsan_Nikaeen1 · November 1, 2021, 8:03pm

and this is flutter doctor:
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.5.3, on Microsoft Windows [Version 10.0.19042.1288], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[√] Chrome - develop for the web
[√] Android Studio (version 2020.3)
[√] Connected device (3 available)

• No issues found!

Nikita_Fedorishchev · November 1, 2021, 8:15pm

Try to minimize the request. Use only setUrl, initApp and default find request.

  @override
  void initState() {
    super.initState();
    Backendless.setUrl('https://eu-api.backendless.com');
    Backendless.initApp(
        applicationId: APP_ID,
        jsApiKey: JS_KEY);

    Backendless.data.of('ProductDetails').find().then((value) => print(value));
  }

I tried to connect to your application and retrieve objects. It worked for me.

Ehsan_Nikaeen1 · November 1, 2021, 8:22pm

What is your backendless version?
and any difference between my flutter and dart version and yours?

Nikita_Fedorishchev · November 1, 2021, 8:23pm

My version of backendless-sdk - 7.1.6.
Flutter - 2.5.2
Dart - 2.14.3

A similar error occurs when the initialization data is incorrectly specified.
It still seems to me that you have incorrectly specified appId\apiKey\url

Nikita_Fedorishchev · November 1, 2021, 8:42pm

Please let me know if the problem is resolved.

Ehsan_Nikaeen1 · November 1, 2021, 9:07pm

No, Error stands. I created a new project and add your codes:

@override
void initState() {
super.initState();
Backendless.setUrl(‘https://eu-api.backendless.com’);
Backendless.initApp(
applicationId: ‘F16241XXXXXXXXXXXXXXXXXX’,
jsApiKey: ‘1D6FA8XXXXXXXXXXXXXXXXX’);
print(‘done’);
Backendless.data.of(‘ProductDetails’).find().then((value) => print(value));
}

outcome:

Debug service listening on ws://127.0.0.1:60902/ZiOB5IZM6XI=/ws
done
Error: PlatformException(error, Expected a value of type ‘Object’, but got one of type ‘Null’, null, null)

Nikita_Fedorishchev · November 1, 2021, 9:45pm

I managed to reproduce your problem, we will investigate it.

Best Regards, Nikita.

Nikita_Fedorishchev · November 2, 2021, 8:39am

We have created an internal ticket BKNDLSS-26668. Whenever we have any news, we will let you know in this thread.

Best Regards, Nikita.

Nikita_Fedorishchev · November 2, 2021, 7:57pm

Hello, @Ehsan_Nikaeen1.

The new version of Flutter-SDK 7.1.7 has been released. Fixed issues with flutter-web.
Let us know if everything is working well for you now.

Best Regards, Nikita.

Ehsan_Nikaeen1 · November 3, 2021, 8:28am

Thanks for your considerations but I tested and nothing changed.
Although when I run runZoneGaurded to catch errors it works fine!
look:
void main() {
runZonedGuarded(() {
runApp(MyApp());
}, (Object error, StackTrace stack) {
getList();
});
}

Future getList() async{

print(‘isInitialized’);
List<Map?>? data = await Backendless.data.of(‘ProductDetails’).find().onError((error, stackTrace) => throw error.toString());
print(data);

}

Nikita_Fedorishchev · November 3, 2021, 9:15am

Make sure you have upgraded to 7.1.7 and also run the flutter pub get command.

Can you help reproduce this issue?
I tried run next code and it works fine:

  void initState() {
    super.initState();
    Backendless.setUrl('https://eu-api.backendless.com');
    Backendless.initApp(
            applicationId: APPID,
            androidApiKey: ANDROID_KEY,
            iosApiKey: IOS_KEY,
            jsApiKey: JS_KEY)
        .then((value) => print('done'));
  }

  void _but() async {
    Backendless.data.of('ProductDetails').find().then((value) => print(value));
  }

Could you share your index.html file with me ?
And describe steps to reproduce?

Best Regards, Nikita.

Nikita_Fedorishchev · November 4, 2021, 8:02pm

Hello, @Ehsan_Nikaeen1.

Did you manage to figure out the problem?

Regards, Nikita.

Ehsan_Nikaeen1 · February 20, 2022, 12:03pm

I started a totally new project and add very simple lines just to read some data! This doesn’t work! No!
and I am stuck!

I use version7.1.9
add that line to index.html and

<script src="https://api.backendless.com/sdk/js/latest/backendless.min.js"></script>


@override
  void initState() {
    super.initState();
    Backendless.initApp(
        applicationId: 'F16241BA-7A18-F7D0-FF2F-XXXXXXXXXXXX',
        jsApiKey: '1D6FA8C7-E93A-4518-XXXXX-XXXXXXXXX');
  }

and getiing:

Error: PlatformException(error, Error: Application with ID F16241BA-7A18-F7D0-FF2F-XXXXXXXXXX does not exist, null, null)
    at Object.throw_ [as throw] (http://localhost:53262/dart_sdk.js:5386:11)
    at StandardMethodCodec.decodeEnvelope (http://localhost:53262/packages/flutter/src/services/restoration.dart.lib.js:2439:19)
    at MethodChannel._invokeMethod (http://localhost:53262/packages/flutter/src/services/restoration.dart.lib.js:1608:47)
    at _invokeMethod.next (<anonymous>)
    at http://localhost:53262/dart_sdk.js:42610:33
    at _RootZone.runUnary (http://localhost:53262/dart_sdk.js:42466:58)
    at _FutureListener.thenAwait.handleValue (http://localhost:53262/dart_sdk.js:37033:29)
    at handleValueCallback (http://localhost:53262/dart_sdk.js:37636:49)
    at Function._propagateToListeners (http://localhost:53262/dart_sdk.js:37674:17)
    at _Future.new.[_completeWithValue] (http://localhost:53262/dart_sdk.js:37516:23)
    at async._AsyncCallbackEntry.new.callback (http://localhost:53262/dart_sdk.js:37539:35)
    at Object._microtaskLoop (http://localhost:53262/dart_sdk.js:42771:13)
    at _startMicrotaskLoop (http://localhost:53262/dart_sdk.js:42777:13)
    at http://localhost:53262/dart_sdk.js:37905:9

Volodymyr_Ialovyi · February 21, 2022, 8:18am

Hello @Ehsan_Nikaeen1

Please try add:

Regards,
Vladimir