flutter build Runtime JAR files in the classpath should have the same version. These files were found in the classpath

Question

flutter build Runtime JAR files in the classpath should have the same version. These files were found in the classpath

How can I solve this problem

w: Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk8/1.5.30/5fd47535cc85f9e24996f939c2de6583991481b0/kotlin-stdlib-jdk8-1.5.30.jar (version 1.5)
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.6.10/e1c380673654a089c4f0c9f83d0ddfdc1efdb498/kotlin-stdlib-jdk7-1.6.10.jar (version 1.6)
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.6.10/b8af3fe6f1ca88526914929add63cf5e7c5049af/kotlin-stdlib-1.6.10.jar (version 1.6)
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.6.10/c118700e3a33c8a0d9adc920e9dec0831171925/kotlin-stdlib-common-1.6.10.jar (version 1.6)
w: Some runtime JAR files in the classpath have an incompatible version. Consider removing them from the classpath
w: Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk8/1.5.30/5fd47535cc85f9e24996f939c2de6583991481b0/kotlin-stdlib-jdk8-1.5.30.jar (version 1.5)
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk7/1.6.10/e1c380673654a089c4f0c9f83d0ddfdc1efdb498/kotlin-stdlib-jdk7-1.6.10.jar (version 1.6)
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib/1.6.10/b8af3fe6f1ca88526914929add63cf5e7c5049af/kotlin-stdlib-1.6.10.jar (version 1.6)
    C:/Users/admin/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.6.10/c118700e3a33c8a0d9adc920e9dec0831171925/kotlin-stdlib-common-1.6.10.jar (version 1.6)
w: Some runtime JAR files in the classpath have an incompatible version. Consider removing them from the classpath

app build.grade setting

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

def keystoreProperties = new Properties()
def keystorePropertiesFile = rootProject.file('key.properties')
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

// crashlytics
apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.google.firebase.crashlytics'

android {
    compileSdkVersion 31

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.mower_app"
        minSdkVersion 21
        targetSdkVersion 31
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    } 
    signingConfigs {
       release {
           keyAlias keystoreProperties['keyAlias']
           keyPassword keystoreProperties['keyPassword']
           storeFile keystoreProperties['storeFile'] ? file(keystoreProperties['storeFile']) : null
           storePassword keystoreProperties['storePassword']
       }
    }
    buildTypes {
        release {
            signingConfig signingConfigs.release
            // 启用由Android Gradle插件执行的资源收缩
            minifyEnabled true 
            shrinkResources true 
            firebaseCrashlytics {
                mappingFileUploadEnabled true
            }
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation platform('com.google.firebase:firebase-bom:29.0.3')
    implementation 'com.google.firebase:firebase-analytics-ktx'
}

android > build.grade

buildscript {
    ext.kotlin_version = '1.6.10'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        // crashlytics
        classpath 'com.google.gms:google-services:4.3.10'
        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.7.1'
        classpath 'com.android.tools.build:gradle:7.1.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

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

task clean(type: Delete) {
    delete rootProject.buildDir
}

How can I solve this problem This problem occurs every time a FLUTTER build occurs flutter 2.10.1 Dart SDK version: 2.16.1 (stable) (Tue Feb 8 12:02:33 2022 +0100) on "windows_x64"

Answer 1

In android/build.gradle change gradle:7.1.2 to gradle:7.3.1

Before

dependencies {
        classpath 'com.android.tools.build:gradle:7.1.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"  
    }

After

dependencies {
        classpath 'com.android.tools.build:gradle:7.3.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }

Run:

flutter build apk --split-per-abi

Answer 2

Add following to android/build.gradle:

dependencies { 
  classpath 'com.android.tools.build:gradle:7.3.1' 
}

It worked for me.

Answer 3

The most upvoted answer by 51v4 alone did not work for me.
Combining his answer and @anton-definit's answer , I've got the solution that worked for me. There were no warning messages shown.

1. Upgrade the jdk version from jdk7 to jdk8 in android/build.gradle. Should look like this

dependencies {
 implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
}

2. Upgrade the Kotlin version to 1.7.10 in android/build.gradle. Should look like this ext.kotlin_version = '1.7.10'

3. Upgrade the Android Gradle plugin to 7.3.0 in android/build.gradle. Should look like this classpath 'com.android.tools.build:gradle:7.3.0'

4. Upgrade the Gradle version to 7.5.1 in android/gradle/wrapper/gradle-wrapper.properties. Should look like this. distributionUrl=https\://services.gradle.org/distributions/gradle-7.5.1-all.zip

5. Delete the folder C:\Users\[user_name_here]\.gradle. If you got any errors when deleting the .gradle folder, open Windows Task Manager and terminate the OpenJDK platform binary then retry deleting. Finally run flutter clean in the terminal.

6. Run your app. Wait patiently, It will take over 10 minutes for re-installing the gradle wrapper & settings and the flutter build apk will be completed without warnings.

Answer 4

In app/build.gradle change jdk7 to Java jdk8

before

dependencies {
 implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

after

dependencies {
 implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
}