The consumer was configured to find a runtime of a component compatible with Java 11, packaged as a jar, and its dependencies declared externally. However we cannot choose between the following variants of org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.1..

안드로이드 스튜디오 Arctic fox 로 업그레이드 후 그간 미뤄왔던 Gradle 7.0 버전을 적용하기로 했다.

그리고 Gradle 7.0 을 적용하면서 반드시 필요하게 된 Java 11 도 함께 적용하기로 결정하고 기존 프로젝트에서 마이그레이션을 진행하였으나.....

따다다다단.....

머리 씨부리쌋노... -_-; 하라는데로 시키는데로 했는데!

A problem occurred configuring root project ''.
> Could not resolve all artifacts for configuration ':classpath'.
   > Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10.
     Required by:
         project :
      > The consumer was configured to find a runtime of a component compatible with Java 11, packaged as a jar, and its dependencies declared externally. However we cannot choose between the following variants of org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10:
          - gradle70JavadocElements
          - gradle70RuntimeElements
          - gradle70SourcesElements
          - javadocElements
          - runtimeElementsWithFixedAttribute
          - sourcesElements
        All of them match the consumer attributes:
          - Variant 'gradle70JavadocElements' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a runtime of a component, and its dependencies declared externally:
              - Unmatched attributes:
                  - Provides documentation but the consumer didn't ask for it
                  - Provides javadocs but the consumer didn't ask for it
                  - Doesn't say anything about its target Java version (required compatibility with Java 11)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Provides attribute 'org.gradle.plugin.api-version' with value '7.0' but the consumer didn't ask for it
                  - Provides release status but the consumer didn't ask for it
          - Variant 'gradle70RuntimeElements' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a runtime of a component compatible with Java 8, packaged as a jar, and its dependencies declared externally:
              - Unmatched attributes:
                  - Provides a library but the consumer didn't ask for it
                  - Provides attribute 'org.gradle.jvm.environment' with value 'standard-jvm' but the consumer didn't ask for it
                  - Provides attribute 'org.gradle.plugin.api-version' with value '7.0' but the consumer didn't ask for it
                  - Provides release status but the consumer didn't ask for it
          - Variant 'gradle70SourcesElements' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a runtime of a component, and its dependencies declared externally:
              - Unmatched attributes:
                  - Provides documentation but the consumer didn't ask for it
                  - Provides sources but the consumer didn't ask for it
                  - Doesn't say anything about its target Java version (required compatibility with Java 11)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Provides attribute 'org.gradle.plugin.api-version' with value '7.0' but the consumer didn't ask for it
                  - Provides release status but the consumer didn't ask for it
          - Variant 'javadocElements' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a runtime of a component, and its dependencies declared externally:
              - Unmatched attributes:
                  - Provides documentation but the consumer didn't ask for it
                  - Provides javadocs but the consumer didn't ask for it
                  - Doesn't say anything about its target Java version (required compatibility with Java 11)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Provides release status but the consumer didn't ask for it
          - Variant 'runtimeElementsWithFixedAttribute' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a runtime of a component compatible with Java 8, packaged as a jar, and its dependencies declared externally:
              - Unmatched attributes:
                  - Provides a library but the consumer didn't ask for it
                  - Provides attribute 'org.gradle.jvm.environment' with value 'standard-jvm' but the consumer didn't ask for it
                  - Provides release status but the consumer didn't ask for it
          - Variant 'sourcesElements' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a runtime of a component, and its dependencies declared externally:
              - Unmatched attributes:
                  - Provides documentation but the consumer didn't ask for it
                  - Provides sources but the consumer didn't ask for it
                  - Doesn't say anything about its target Java version (required compatibility with Java 11)
                  - Doesn't say anything about its elements (required them packaged as a jar)
                  - Provides release status but the consumer didn't ask for it
        The following variants were also considered but didn't match the requested attributes:
          - Variant 'apiElementsWithFixedAttribute' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a component compatible with Java 8, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares an API of a component and the consumer needed a runtime of a component
          - Variant 'gradle70ApiElements' capability org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.10 declares a component compatible with Java 8, packaged as a jar, and its dependencies declared externally:
              - Incompatible because this component declares an API of a component and the consumer needed a runtime of a component

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.ProjectConfigurationException: A problem occurred configuring root project ''.
	at org.gradle.configuration.project.LifecycleProjectEvaluator.wrapException(LifecycleProjectEvaluator.java:75)
	at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:68)
	at org.gradle.configuration.project.LifecycleProjectEvaluator.access$600(LifecycleProjectEvaluator.java:51)
	at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject$1.run(LifecycleProjectEvaluator.java:104)
	at org.gradle.internal.Factories$1.create(Factories.java:26)

여튼 저런 오류를 뿜으면서 마이그레이션에 빨간불이 들어왔다.

구글링을 한참 하면서 JDK 11의 패스가 어쩌구... 머가 어쩌구 했으나 해결되지 않았다.

현재 나의 프로젝트 상태는 아래와 같았다.
************** 수정전 *************

# project build.gradle #

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = "1.7.10"
    ext.room_version = "2.4.3"
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:7.0.4"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.13'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

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

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

# app build.gradle #

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-kapt'
    id 'com.google.gms.google-services'
}

android {
    compileSdkVersion 32

    defaultConfig {
        applicationId "com."
        minSdkVersion 23
        targetSdkVersion 32
        versionCode 1
        versionName "1.0"
        vectorDrawables.useSupportLibrary = true

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_11
        targetCompatibility JavaVersion.VERSION_11
    }
    kotlinOptions {
        jvmTarget = "11"
    }

    viewBinding {
        enabled = true
    }
}

dependencies {

    // Room
    implementation("androidx.room:room-runtime:$room_version")
    annotationProcessor("androidx.room:room-compiler:$room_version")

    // To use Kotlin annotation processing tool (kapt)
    kapt("androidx.room:room-compiler:$room_version")

    // optional - Kotlin Extensions and Coroutines support for Room
    implementation("androidx.room:room-ktx:$room_version")

    // optional - RxJava2 support for Room
    implementation("androidx.room:room-rxjava2:$room_version")

    //noinspection GradleDependency
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.8.0'
    implementation 'androidx.appcompat:appcompat:1.4.2'
    implementation 'com.google.android.material:material:1.6.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'androidx.navigation:navigation-fragment-ktx:2.5.1'
    implementation 'androidx.navigation:navigation-ui-ktx:2.5.1'
    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.5.1'
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1'

    // For FCM receive
    implementation platform('com.google.firebase:firebase-bom:26.3.0')
    implementation 'com.google.firebase:firebase-analytics-ktx'
    implementation 'com.google.firebase:firebase-messaging-ktx'

    implementation 'com.squareup.okhttp3:okhttp:4.9.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:4.9.0'
    implementation 'com.squareup.okhttp3:okhttp-urlconnection:4.9.0'
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.9.0'
    implementation 'com.google.code.gson:gson:2.8.9'
    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
    implementation 'io.reactivex.rxjava2:rxkotlin:2.4.0'

    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

# setting.gradle #

include ':app'
rootProject.name = "Android"

# gradle.properties #

# Project-wide Gradle settings.
# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.
# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true
# AndroidX package structure to make it clearer which packages are bundled with the
# Android operating system, and which are packaged with your app"s APK
# https://developer.android.com/topic/libraries/support-library/androidx-rn
android.useAndroidX=true
# Automatically convert third-party libraries to use AndroidX
android.enableJetifier=true
# Kotlin code style for this project: "official" or "obsolete":
kotlin.code.style=official

# gradle-wrapper.properties #

#Tue Aug 09 13:09:00 KST 2022
distributionBase=GRADLE_USER_HOME
distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
distributionPath=wrapper/dists
zipStorePath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME

이런 상태 였으나.. 아래와 같이 수정하고 재시도하였다.
************ 수정후 ***********

# project build.gradle #

// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
    id 'com.android.application' version '7.2.1' apply false
    id 'com.android.library' version '7.2.1' apply false
    id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
    id 'com.google.gms.google-services' version '4.3.13' apply false
}

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

# app build.gradle #

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'com.google.gms.google-services'
    id 'kotlin-kapt'
}

android {
    compileSdkVersion 32

    defaultConfig {
        applicationId "com.ldhcjs.androidprivatemessenger"
        minSdkVersion 23
        targetSdkVersion 32
        versionCode 1
        versionName "1.0"
        vectorDrawables.useSupportLibrary = true

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_11
        targetCompatibility JavaVersion.VERSION_11
    }
    kotlinOptions {
        jvmTarget = "11"
    }

    viewBinding {
        enabled = true
    }
}

dependencies {
    implementation 'androidx.core:core-ktx:1.8.0'
    implementation 'androidx.appcompat:appcompat:1.4.2'
    implementation 'com.google.android.material:material:1.6.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'androidx.navigation:navigation-fragment-ktx:2.5.1'
    implementation 'androidx.navigation:navigation-ui-ktx:2.5.1'

    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.5.1'
    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1'

    // For FCM receive
    // implementation 'com.google.gms:google-services:4.3.13'
    implementation platform('com.google.firebase:firebase-bom:30.3.0')
    implementation 'com.google.firebase:firebase-analytics-ktx'
    implementation 'com.google.firebase:firebase-messaging-ktx'

    implementation 'com.squareup.okhttp3:okhttp:4.9.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:4.9.0'
    implementation 'com.squareup.okhttp3:okhttp-urlconnection:4.9.0'

    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.9.0'

    implementation 'com.google.code.gson:gson:2.8.9'
    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
    implementation 'io.reactivex.rxjava2:rxkotlin:2.4.0'

    // Room
    implementation("androidx.room:room-runtime:2.4.3")
    annotationProcessor("androidx.room:room-compiler:2.4.3")
    implementation("androidx.room:room-rxjava2:2.4.3")
    // kapt in not compatible for gradle version 7+ ??
    kapt("androidx.room:room-compiler:2.4.3")

    // For FCM send
//    implementation 'com.google.firebase:firebase-admin:7.0.1'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

# setting.gradle #

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

rootProject.name = "AndroidPrivateMessenger"
include ':app'

# gradle.properties #

# Project-wide Gradle settings.
# IDE (e.g. Android Studio) users:
# Gradle settings configured through the IDE *will override*
# any settings specified in this file.
# For more details on how to configure your build environment visit
# http://www.gradle.org/docs/current/userguide/build_environment.html
# Specifies the JVM arguments used for the daemon process.
# The setting is particularly useful for tweaking memory settings.
org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
# When configured, Gradle will run in incubating parallel mode.
# This option should only be used with decoupled projects. More details, visit
# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
# org.gradle.parallel=true
# AndroidX package structure to make it clearer which packages are bundled with the
# Android operating system, and which are packaged with your app"s APK
# https://developer.android.com/topic/libraries/support-library/androidx-rn
android.useAndroidX=true
# Automatically convert third-party libraries to use AndroidX
android.enableJetifier=true
# Kotlin code style for this project: "official" or "obsolete":
kotlin.code.style=official
# Enables namespacing of each library's R class so that its R class includes only the
# resources declared in the library itself and none from the library's dependencies,
# thereby reducing the size of the R class for that library
android.nonTransitiveRClass=true

# gradle-wrapper.properties #

#Tue Aug 09 13:09:00 KST 2022
distributionBase=GRADLE_USER_HOME
distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
distributionPath=wrapper/dists
zipStorePath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME

로 수정하고 sync 하였으나 역시 동일한 에러...

결국 문제는 Gradle wrapper 까지 버전 통일이 되지 않은 것이 문제였다. 하.. 이것 때문에 하루 동안 엄청난 삽질을 했으나 해결해서 다행이다.