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I have created a maven repository and uploaded it to Github. When I add it as a dependency to a sample project, the gradle sync completes successfully. But when I try to run the app, it crashes with a java.lang.NoClassDefFoundError.

Link to repository: https://github.com/rjain90/sdk

Sample project code:

Project build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript 
 ext
 kotlin_version = '1.3.20'
 realm_version = '5.8.0'
 
 repositories 
 google()
 jcenter()
 maven url "https://raw.githubusercontent.com/rjain90/sdk/master/" 
 
 dependencies 
 classpath 'com.android.tools.build:gradle:3.3.1'
 classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 classpath "io.realm:realm-gradle-plugin:$realm_version"
 // NOTE: Do not place your application dependencies here; they belong
 // in the individual module build.gradle files
 


allprojects 
 repositories 
 google()
 jcenter()
 maven url "https://raw.githubusercontent.com/rjain90/sdk/master/" 
 


task clean(type: Delete) 
 delete rootProject.buildDir


ext
 lifecycle_version = '2.0.0'
 android_support_version = '1.1.0-alpha01'
 legacy_support_version = '1.0.0'
 constraint_version = '1.1.3'

 retrofit_version = '2.4.0'
 dagger_version = '2.16'

 rxjava_version = '2.1.7'
 rxandroid_version = '2.0.1'

Module build.gradle

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

apply plugin: 'kotlin-kapt'

apply plugin: 'realm-android'

// Load keystore
def keystorePropertiesFile = rootProject.file("keystore.properties");
def keystoreProperties = new Properties()
keystoreProperties.load(new FileInputStream(keystorePropertiesFile))

android 
 signingConfigs 
 release 
 keyAlias keystoreProperties['ANDROID_KEY_ALIAS']
 keyPassword keystoreProperties['ANDROID_KEY_PASSWORD']
 storeFile file(keystoreProperties['ANDROID_KEYSTORE_LOCATION'])
 storePassword keystoreProperties['ANDROID_STORE_PASSWORD']
 
 

 compileSdkVersion 28
 defaultConfig 
 applicationId "com.bowstring.godworld"
 minSdkVersion 21
 targetSdkVersion 28
 versionCode 1
 versionName "1.0"
 testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 
 buildTypes 
 debug 
 debuggable true
 minifyEnabled false
 shrinkResources false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 

 release 
 signingConfig signingConfigs.release
 debuggable false
 minifyEnabled true
 shrinkResources true
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 
 
 compileOptions 
 sourceCompatibility 1.8
 targetCompatibility 1.8
 


dependencies 
 implementation fileTree(include: ['*.jar'], dir: 'libs')
 implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
 kapt "androidx.lifecycle:lifecycle-compiler:$lifecycle_version"

 implementation "androidx.appcompat:appcompat:$android_support_version"
 implementation "androidx.constraintlayout:constraintlayout:$constraint_version"

 implementation "com.squareup.retrofit2:retrofit:$retrofit_version"
 implementation "com.squareup.retrofit2:converter-gson:$retrofit_version"
 implementation "com.squareup.retrofit2:adapter-rxjava2:$retrofit_version"

 implementation "com.google.dagger:dagger:$dagger_version"
 kapt "com.google.dagger:dagger-compiler:$dagger_version"

 implementation "io.reactivex.rxjava2:rxandroid:$rxandroid_version"

 implementation "androidx.legacy:legacy-support-v4:$legacy_support_version"
 testImplementation 'junit:junit:4.12'
 androidTestImplementation 'androidx.test:runner:1.1.0-alpha4'
 androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0-alpha4'


 implementation 'com.squareup.picasso:picasso:2.71828'

 implementation 'com.cabfare.android:sdk:0.0.18@aar'

For GitHub hosted, you can use https://jitpack.io as a Maven repository.

Add maven url 'https://jitpack.io' into the project build.gradle's allprojects -> repositories block, then in your module build.gradle, add a dependency implementation 'com.github.rjain90:sdk:0.0.17', for example.

However, your two releases are both containing build errors. Solve them first.