flutter build aar fails with type plugin

[razfazz]

Is there an existing issue for this?

• I have searched the existing issues
• I have read the guide to filing a bug

Steps to reproduce

1. Create a plugin with the following command

flutter create -t plugin --platforms android --org com.plugi pl_plugin

2. Create aar file with command

flutter build aar

Expected results

The process should produce an aar file

Actual results

Running Gradle task 'assembleAarDebug'...                           7.0s

e: C:\Users\user\repos\code\pl_plugin\android\src\main\kotlin\com\plugi\pl_plugin\PlPlugin.kt: (3, 28): Unresolved reference: NonNull

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction

Code sample

Code sample

[Paste your code here]

Screenshots or Video

Screenshots / Video demonstration

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Logs

Logs

[Paste your logs here]

Flutter Doctor output

Doctor output

[√] Flutter (Channel stable, 3.13.9, on Microsoft Windows [Version 10.0.22621.2428], locale en-DE)
    • Flutter version 3.13.9 on channel stable at C:\Users\user\devenv\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision d211f42860 (5 days ago), 2023-10-25 13:42:25 -0700
    • Engine revision 0545f8705d
    • Dart version 3.1.5
    • DevTools version 2.25.0

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at C:\Users\user\AppData\Local\Android\sdk
    • Platform android-34, build-tools 34.0.0
    • Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-b2043.56-10027231)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.7.3)
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.7.34024.191
    • Windows 10 SDK version 10.0.22621.0

[√] Android Studio (version 2022.3)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-b2043.56-10027231)

[√] VS Code (version 1.83.1)
    • VS Code at C:\Users\user\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension can be installed from:
       https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[√] Connected device (4 available)
    • GM1913 (mobile)   • 94dbf972 • android-arm64  • Android 12 (API 31)
    • Windows (desktop) • windows  • windows-x64    • Microsoft Windows [Version 10.0.22621.2428]
    • Chrome (web)      • chrome   • web-javascript • Google Chrome 118.0.5993.118
    • Edge (web)        • edge     • web-javascript • Microsoft Edge 118.0.2088.76

[√] Network resources
    • All expected network resources are available.

• No issues found!

[danagbemava-nc]

Reproducible using the steps outlined above.

logs

Running Gradle task 'assembleAarDebug'...                         219.4s

e: /Users/nexus/projects/nevercode/testplugin/android/src/main/kotlin/com/example/testplugin/TestpluginPlugin.kt: (3, 28): Unresolved reference: NonNull

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
   > Compilation error. See log for more details

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 3m 38s


Gradle task assembleAarDebug failed with exit code 1.

flutter doctor -v

[✓] Flutter (Channel stable, 3.13.9, on macOS 14.0 23A344 darwin-arm64, locale en-GB)
    • Flutter version 3.13.9 on channel stable at /Users/nexus/dev/sdks/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision d211f42860 (6 days ago), 2023-10-25 13:42:25 -0700
    • Engine revision 0545f8705d
    • Dart version 3.1.5
    • DevTools version 2.25.0

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
    • Android SDK at /Users/nexus/Library/Android/sdk
    • Platform android-33, build-tools 33.0.1
    • Java binary at: /Users/nexus/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.0)
    • Xcode at /Applications/Xcode-15.0.0-Release.Candidate.app/Contents/Developer
    • Build 15A240d
    • CocoaPods version 1.13.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
    • Android Studio at /Users/nexus/Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] IntelliJ IDEA Ultimate Edition (version 2023.2.3)
    • IntelliJ at /Users/nexus/Applications/IntelliJ IDEA Ultimate.app
    • Flutter plugin version 76.0.4
    • Dart plugin version 232.10072.19

[✓] VS Code (version 1.83.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.74.0

[✓] Connected device (4 available)
    • Nexus (mobile)       • 00008020-001875E83A38002E • ios            • iOS 17.1 21B74
    • Dean’s iPad (mobile) • 00008103-000825C811E3401E • ios            • iOS 17.1 21B74
    • macOS (desktop)      • macos                     • darwin-arm64   • macOS 14.0 23A344 darwin-arm64
    • Chrome (web)         • chrome                    • web-javascript • Google Chrome 118.0.5993.117

[✓] Network resources
    • All expected network resources are available.

• No issues found!

[!] Flutter (Channel master, 3.16.0-20.0.pre.8, on macOS 14.0 23A344 darwin-arm64, locale en-GB)
    • Flutter version 3.16.0-20.0.pre.8 on channel master at /Users/nexus/dev/sdks/flutters
    ! Warning: `flutter` on your path resolves to /Users/nexus/dev/sdks/flutter/bin/flutter, which is not inside your current Flutter SDK checkout at /Users/nexus/dev/sdks/flutters. Consider adding /Users/nexus/dev/sdks/flutters/bin to the front of your path.
    ! Warning: `dart` on your path resolves to /Users/nexus/dev/sdks/flutter/bin/dart, which is not inside your current Flutter SDK checkout at /Users/nexus/dev/sdks/flutters. Consider adding /Users/nexus/dev/sdks/flutters/bin to the front of your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision deeb6a2dfe (5 hours ago), 2023-10-30 23:04:25 -0400
    • Engine revision 17eff7ab62
    • Dart version 3.3.0 (build 3.3.0-79.0.dev)
    • DevTools version 2.28.1
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
    • Android SDK at /Users/nexus/Library/Android/sdk
    • Platform android-33, build-tools 33.0.1
    • Java binary at: /Users/nexus/Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.0)
    • Xcode at /Applications/Xcode-15.0.0-Release.Candidate.app/Contents/Developer
    • Build 15A240d
    • CocoaPods version 1.13.0

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
    • Android Studio at /Users/nexus/Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] IntelliJ IDEA Ultimate Edition (version 2023.2.3)
    • IntelliJ at /Users/nexus/Applications/IntelliJ IDEA Ultimate.app
    • Flutter plugin version 76.0.4
    • Dart plugin version 232.10072.19

[✓] VS Code (version 1.83.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.74.0

[✓] Connected device (4 available)
    • Nexus (mobile)       • 00008020-001875E83A38002E • ios            • iOS 17.1 21B74
    • Dean’s iPad (mobile) • 00008103-000825C811E3401E • ios            • iOS 17.1 21B74
    • macOS (desktop)      • macos                     • darwin-arm64   • macOS 14.0 23A344 darwin-arm64
    • Chrome (web)         • chrome                    • web-javascript • Google Chrome 118.0.5993.117

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.

[christopherfujino]

@razfazz in order to build an AAR file, you must run flutter build aar on a valid Flutter application, not a plugin. If you want to test out your new plugin, you can use flutter build aar or flutter run within the generated example directory of your plugin project (this is a valid, minimal Flutter application).

Does this make sense, or am I misunderstanding your intention?

turns out this comment is wrong, see next comment

[danagbemava-nc]

@christopherfujino, if you run flutter build aar in the example directory (application) you get an error that states AARs can only be built for plugin or module projects.

[christopherfujino]

@christopherfujino, if you run flutter build aar in the example directory (application) you get an error that states AARs can only be built for plugin or module projects.

:O

I better take a closer look then :)