Android Kotlin : Error Unresolved reference: DaggerAppComponent

On my end, as of

Kotlin version 1.5.30
Dagger version 2.35.1
Dagger support version 2.28.3

There's an issue with dagger 2 (above versions) and kotlin 1.5.30. When you try to run the project using

implementation 'com.google.dagger:dagger:2.35.1'
implementation 'com.google.dagger:dagger-android:2.35.1'
implementation 'com.google.dagger:dagger-android-support:2.28.3'
kapt 'com.google.dagger:dagger-compiler:2.28.3'
kapt 'com.google.dagger:dagger-android-processor:2.28.3'

It will fail with error:

java.lang.reflect.InvocationTargetException

When i used Run with --stacktrace i found out that the issue was:

IllegalStateException: Unsupported metadata version" in KaptWithoutKotlincTask with 1.5.0-M2

I found out that this is because Dagger uses the old version of kotlinx-metadata-jvm library & doesn't support kotlin version 1.5 and above yet.

So as a fix, i added:

kapt 'org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.2.0'

I don't know if there's an official fix to this yet, but this might help someone.

N:B: i tried changing from kapt to annotationProcessor, and though the project compiled, i still couldn't generate DaggerAppComponent

I was getting the same error message, but my case was different than yours. The unresolved reference appeared only when generating signed APK. This is how I solved it:

app/build.gradle

kapt {
    generateStubs = true
}

dependencies {
    //...
    implementation 'com.google.dagger:dagger:2.9'
    kapt 'com.google.dagger:dagger-compiler:2.9'
}

I can now deploy my signed APK without errors

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"

At first, It gives an error after rebuild:

Unresolved reference: DaggerAppComponent

You should try to import (Alt + Enter) that component.