I have installed Kotlin plugin today into an existing project with Dagger 2. Before Kotlin was installed I had no issues with Dagger. However, now the compiler complains :
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
And in your dependencies:
implementation "com.google.dagger:dagger:2.x"
implementation "com.google.dagger:dagger-android:2.x"
implementation "com.google.dagger:dagger-android-support:2.x"
kapt "com.google.dagger:dagger-compiler:2.x"
kapt "com.google.dagger:dagger-android-processor:2.x"