Solution: How to fix NoClassDefFoundError and configure Kotlin to work alongside Java in Android Studio?

For those who’re struggling, I got this working by using Tools > Kotlin > Configure Kotlin in Android Studio. If you don’t have the option, you can manually configure it by:

1. Adding the following to the project build.gradle:

buildscript {

ext.kotlin_version = ‘1.2.70'

repositories {

mavenCentral()

}

dependencies {

classpath “org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version”

}

2. Adding the following to the module build.gradle:

apply plugin: ‘kotlin-android’

buildscript {

repositories {

mavenCentral()

}

}

dependencies {

implementation “org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version”

}

Happy Coding!