Dart Error: Dart_LookupLibrary When building/running app in release mode.

[radarlabs]

Dart Error: Dart_LookupLibrary When building/running app in release mode.

[atharvsharma1998]

yes adding @pragma('vm:entry-point') to callbackDispatcher and the onEvents method solved the issue. Thanks. is it recommended to be added to every event listener?

[KennyHuRadar]

Can you try adding the vm entry point to the callbackDispatcher instead like such

@pragma('vm:entry-point')
void callbackDispatcher() {
  const MethodChannel _backgroundChannel =
      MethodChannel('flutter_radar_background');
  WidgetsFlutterBinding.ensureInitialized();

  _backgroundChannel.setMethodCallHandler((MethodCall call) async {
    final args = call.arguments;
    final CallbackHandle handle = CallbackHandle.fromRawHandle(args[0]);
    final Function? callback = PluginUtilities.getCallbackFromHandle(handle);
    final Map res = args[1];
    
    callback?.call(res);
  });
}

It may also be helpful to add the following to your proguard-rules.pro while debugging:

// this will force R8 to not keep all Radar related classes
-keep class io.radar.** { *; }
// This will print all the classes that were removed by the obfuscation
-printusage debug-dir/usage.txt
// This will print the classes that "seed" what is kept by the obfuscation
-printseeds debug-dir/seeds.txt

[atharvsharma1998]

Thanks for the fix, but using it didn't work. I'm getting error

E/flutter (26098): [ERROR:flutter/lib/ui/dart_runtime_hooks.cc(38)] Dart Error: Dart_LookupLibrary: library 'package:hot_frontend/screens/MapScreen.dart' not found.

[atharvsharma1998]

I haven't been able to exactly follow the workaround as the file structure/logic have changed so couldn't tell if this solution works or not. Also, is this issue reproducible by radar team as I'm getting it in example radar project too?
flutter/flutter#91841 (comment)
flutter/flutter#91841 (comment)

[KennyHuRadar]

I am seeing a different error on the example app.

E/flutter (27400): [ERROR:flutter/lib/ui/dart_runtime_hooks.cc(38)] Dart Error: Class '_MyAppState' not found in library ''.
E/flutter (27400): [ERROR:flutter/shell/common/shell.cc(117)] Dart Error: Class '_MyAppState' not found in library ''.

I think the new entry point annotation was able to resolve the issue of the obfuscation but may introduce a new issue. We are looking into it.

[KennyHuRadar]

I was able to suppress the errors that I was getting on the example app by adding the same annotation to the static methods we want to use as callbacks.

@pragma('vm:entry-point')
static void onEvents(Map res) {
print('📍📍 onEvents: $res');
}
  .....
Radar.onEvents(onEvents);

This is done in addition to adding the annotation to the callbackDispatcher as described in #41 (comment)

[KennyHuRadar]

Yes, all event listeners are "passed into the native layer". As such, we need to add the annotation for them so that they can be executed when the native code executes the callback.

We will be cutting a release with this fix soon! Hopefully this workaround is sufficient in the meantime.

[atharvsharma1998]

issue patched in v3.9.1