flutter build apk results in "Module was compiled with an incompatible version of Kotlin..."

[michaelokonji]

Description

flutter run works, but flutter build apk returns error for amplify kotlin module versions incompatibility.

Please help.

PS C:\Users\mich\workspaces\dev\app> flutter build apk
Font asset "MaterialIcons-Regular.otf" was tree-shaken, reducing it from 1645184 to 1424 bytes (99.9% reduction). Tree-shaking can be disabled by providing the --no-tree-shake-icons flag when building your app.
e: C:/Users/mich/workspaces/dev/app/build/amplify_secure_storage/.transforms/882fc968585de2a39939a5ade8ba94a7/transformed/out/jars/classes.jar!/META-INF/amplify_secure_storage_release.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
e: C:/Users/mich/workspaces/dev/app/build/amplify_analytics_pinpoint/.transforms/86ba004b69ab9b970b47a9b61df31275/transformed/out/jars/classes.jar!/META-INF/amplify_analytics_pinpoint_release.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
e: C:/Users/mich/workspaces/dev/app/build/amplify_db_common/.transforms/5f76e43e93e3d2d06d16b288304d908d/transformed/out/jars/classes.jar!/META-INF/amplify_db_common_release.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
e: C:/Users/mich/workspaces/dev/app/build/amplify_auth_cognito/.transforms/ed980aea3cd907e9d20b8ec694411005/transformed/out/jars/classes.jar!/META-INF/amplify_auth_cognito_release.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
e: C:/Users/mich/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.9.10/72812e8a368917ab5c0a5081b56915ffdfec93b7/kotlin-stdlib-1.9.10.jar!/META-INF/kotlin-stdlib.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
e: C:/Users/mich/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.9.10/72812e8a368917ab5c0a5081b56915ffdfec93b7/kotlin-stdlib-1.9.10.jar!/META-INF/kotlin-stdlib-jdk8.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
e: C:/Users/mich/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.9.10/72812e8a368917ab5c0a5081b56915ffdfec93b7/kotlin-stdlib-1.9.10.jar!/META-INF/kotlin-stdlib-jdk7.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
e: C:/Users/mich/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.9.10/dafaf2c27f27c09220cee312df10917d9a5d97ce/kotlin-stdlib-common-1.9.10.jar!/META-INF/kotlin-stdlib-common.kotlin_module: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.9.0, expected version is 1.6.0.
Running Gradle task 'assembleRelease'...                           70.3s
√  Built build\app\outputs\flutter-apk\app-release.apk (58.6MB).
PS C:\Users\mich\workspaces\dev\app>

Categories

• Analytics
• API (REST)
• API (GraphQL)
• Auth
• Authenticator
• DataStore
• Notifications (Push)
• Storage

Steps to Reproduce

• pubspec.yaml

name: app
description: "A new Flutter project."
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

version: 1.0.0+1

environment:
  sdk: '>=3.3.4 <4.0.0'

dependencies:
  flutter:
    sdk: flutter
  amplify_auth_cognito: ^1.8.0
  amplify_flutter: ^1.8.0    
  logger: ^2.2.0
  cupertino_icons: ^1.0.6  

dev_dependencies:
  flutter_test:
    sdk: flutter
  mocktail: ^1.0.3
  integration_test:
    sdk: flutter    
  flutter_lints: ^3.0.0

flutter:
  uses-material-design: true
  assets:
    - assets/globe_logo.png

• settings.gradle

pluginManagement {
    def flutterSdkPath = {
        def properties = new Properties()
        file("local.properties").withInputStream { properties.load(it) }
        def flutterSdkPath = properties.getProperty("flutter.sdk")
        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
        return flutterSdkPath
    }
    settings.ext.flutterSdkPath = flutterSdkPath()

    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")

    repositories {
        google()
        mavenCentral()
        gradlePluginPortal()
    }
}

plugins {
    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
    id "com.android.application" version "7.3.0" apply false
    id "org.jetbrains.kotlin.android" version "1.9.10" apply false
}

include ":app"

• build.gradle

buildscript {
    ext.kotlin_version = '1.9.10'
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:8.1.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

tasks.register("clean", Delete) {
    delete rootProject.buildDir
}

• gradle-wrapper.properties

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-all.zip

Screenshots

No response

Platforms

• iOS
• Android
• Web
• macOS
• Windows
• Linux

Flutter Version

3.19.6

Amplify Flutter Version

1.8.0

Deployment Method

Amplify CLI

Schema

No response

[Jordan-Nelson]

@michaelokonji I think those may be warnings. The command seems to complete as it finishes with √ Built build\app\outputs\flutter-apk\app-release.apk (58.6MB).

Do you see an apk in that directory? You should be able to install it on your device with flutter install

[michaelokonji]

@Jordan-Nelson You're correct, the build completes and app-release.apk is in the specified path but I'm uncertain if I can safely ignore these and move forward with with my release.

[Jordan-Nelson]

@michaelokonji - Thanks for the update. We will take a look at warnings and get back to you.

[harini18]

When I run flutter build appbundle --release
I get

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':amplify_db_common:compileReleaseJavaWithJavac'.

error: invalid source release: 17

My pubspec.yml

dependencies:
amplify_auth_cognito: ^2.0.0
amplify_authenticator: ^2.0.0
amplify_flutter: ^2.0.0

settings.gradle

plugins {
id "dev.flutter.flutter-plugin-loader" version "1.0.0"
id "com.android.application" version "7.4.2" apply false
id "org.jetbrains.kotlin.android" version "1.9.10" apply false
}

[NikaHsn]

thank you for providing these details. we will look into this issue and get back to you with any updates.

[Jordan-Nelson]

@harini18 - Do you mind opening a separate issue so that we can keep this issue focused on the "incompatible version of kotlin" warning?

[Jordan-Nelson]

@michaelokonji I was able to reproduce this following the set up for Android in the docs. I think this is caused by using Android Gradle Plugin (AGP) v7 and Kotlin 1.9. If you update AGP to v8.1 and gradle to v8.0, the issue should go away. Here are the steps you would take to do that (Note: if your app was created prior to Flutter 3.16 follow these steps first):

• update com.android.application in android/settings.gradle to "8.1.0"
• update org.jetbrains.kotlin.android in android/settings.gradle to "1.9.10"
• update distributionUrl in android/gradle/wrapper/gradle-wrapper.properties to https\://services.gradle.org/distributions/gradle-8.0-all.zip
• update sourceCompatibility and targetCompatibility in android/app/build.gradle to JavaVersion.VERSION_17

Let me know if you have any issues. I am going to mark this as a docs issue since our docs currently recommend using a lower version of AGP and gradle

[Jordan-Nelson]

The documentation has been updated. Please refer to https://docs.amplify.aws/flutter/start/platform-setup/#android and let use know if you have any questions. Thanks.