Unable to resolve dependency for ':app#debugUnitTest/compileClasspath': Could not resolve androidx.constraintlayout:constraintLayout:1.1.3 - android-gradle-plugin

Question

y build is failing with the error message
Unable to resolve dependency for ':app#debugUnitTest/compileClasspath': Could not resolve androidx.constraintlayout:constraintLayout:1.1.3
ConstraintLayout version:1.1.3
Gradle plugin version : 4.0.1
Gradle version : 6.1.1
My app_build gradle is as follows
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.xxxxx.xxxxxxx"
minSdkVersion 19
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.constraintlayout:constraintLayout:1.1.3'
implementation 'androidx.annotation:annotation:1.1.0'
// To use the Java-compatible #Experimental API annotation
implementation "androidx.annotation:annotation-experimental:1.0.0"
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.0'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
def room_version = "2.2.5"
def lifecycle_version = "2.2.0"
implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"
// For Lifecycle dependencies:
implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
annotationProcessor "androidx.lifecycle:lifecycle-compiler:$lifecycle_version"
// optional - RxJava support for Room
implementation "androidx.room:room-rxjava2:$room_version"
// Test helpers
testImplementation "androidx.room:room-testing:$room_version"
}
My project build.gradle is
buildscript {
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:4.0.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
maven {
// For Room Persistence Library
url "https://maven.google.com"
}
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

Answer 1

The package androidx.constraintlayout does not exist in jcenter()
https://jcenter.bintray.com/androidx/
what you can do however,
allprojects {
repositories {
mavenCentral()
google()
jcenter()
maven {
// For Room Persistence Library
url "https://maven.google.com"
}
} }