fix(android): prevent crash if callbackInfo is null in BackgroundWorker (fixes #527)

[Tulleb]

Fixes #527 and also properly compile.

The previously opened PR #615 is currently having the following issue.

@jonathanduke let me know if you commit a fix on your PR; I'll close this one then.

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[Tulleb]

Closed after #615's fix 👍

[kedaly]

A quick question, what is the cadence of release of this fix?

If I am affected by it, how would I access it?

Do I need to simply use a branch of this project, or will there be a release to pub.dev soon?

[Tulleb]

A quick question, what is the cadence of release of this fix?

If I am affected by it, how would I access it?

Do I need to simply use a branch of this project, or will there be a release to pub.dev soon?

Sorry I can't really say about the cadence of release.

But in the meantime, you can add this at the end of your pubspec.yaml file, until the #615 is merged and released:

dependency_overrides:
  # TODO: Rebase on official repo once fixed
  # https://github.com/fluttercommunity/flutter_workmanager/pull/619
  workmanager:
    git:
      url: https://github.com/tulleb/flutter_workmanager.git
      ref: fix/527
      path: workmanager
  workmanager_android:
    git:
      url: https://github.com/tulleb/flutter_workmanager.git
      ref: fix/527
      path: workmanager_android
  workmanager_apple:
    git:
      url: https://github.com/tulleb/flutter_workmanager.git
      ref: fix/527
      path: workmanager_apple
  workmanager_platform_interface:
    git:
      url: https://github.com/tulleb/flutter_workmanager.git
      ref: fix/527
      path: workmanager_platform_interface

[answer0732]

Hi, thank you very much for providing this workaround.

I was wondering if this fix also resolves the problem discussed in issue #621?

Appreciate your support!

[Tulleb]

Hi, thank you very much for providing this workaround.

I was wondering if this fix also resolves the problem discussed in issue #621?

Appreciate your support!

Yes it should fix it 👍
Your crash stacktrace looks the same.

[Muneeza-PT]

I am also facing this issue
App crash after update and this is crash log:

Issue details
io.flutter.embedding.engine.dart.DartExecutor$DartCallback.toString
java.lang.NullPointerException

Exception java.lang.NullPointerException: Attempt to read from field 'java.lang.String io.flutter.view.FlutterCallbackInformation.callbackLibraryPath' on a null object reference in method 'java.lang.String io.flutter.embedding.engine.dart.DartExecutor$DartCallback.toString()'
at io.flutter.embedding.engine.dart.DartExecutor$DartCallback.toString (DartExecutor.java:426)
at java.lang.String.valueOf (String.java:4112)
at java.lang.StringBuilder.append (StringBuilder.java:179)
at io.flutter.embedding.engine.dart.DartExecutor.executeDartCallback (DartExecutor.java:181)
at dev.fluttercommunity.workmanager.BackgroundWorker.startWork$lambda$5 (BackgroundWorker.kt:111)
at android.os.Handler.handleCallback (Handler.java:942)
at android.os.Handler.dispatchMessage (Handler.java:99)
at android.os.Looper.loopOnce (Looper.java:204)
at android.os.Looper.loop (Looper.java:291)
at android.app.ActivityThread.main (ActivityThread.java:8168)
at java.lang.reflect.Method.invoke
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:601)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1136)