Kotlin tests the use of Android Room, and when calling Room.databaseBuilder in coroutine, it reports an error:

AppDatabase_Impl does not exist

After checking the developer documentation, you can configure it according to the documentation. After thinking deeply, you find that there is a problem with the developer documentation

dependencies {
    val room_version = "2.4.3"

    implementation("androidx.room:room-runtime:$room_version")
    annotationProcessor("androidx.room:room-compiler:$room_version")

    // To use Kotlin annotation processing tool (kapt)
    kapt("androidx.room:room-compiler:$room_version")
    // To use Kotlin Symbol Processing (KSP)
    ksp("androidx.room:room-compiler:$room_version")

    // optional - Kotlin Extensions and Coroutines support for Room
    implementation("androidx.room:room-ktx:$room_version")

    // optional - RxJava2 support for Room
    implementation("androidx.room:room-rxjava2:$room_version")

    // optional - RxJava3 support for Room
    implementation("androidx.room:room-rxjava3:$room_version")

    // optional - Guava support for Room, including Optional and ListenableFuture
    implementation("androidx.room:room-guava:$room_version")

    // optional - Test helpers
    testImplementation("androidx.room:room-testing:$room_version")

    // optional - Paging 3 Integration
    implementation("androidx.room:room-paging:2.5.0-alpha03")
}

The above developer documents give, but when adding dependencies, one dependency is:

 kapt("androidx.room:room-compiler:$room_version")

So the problem lies here. There is a dependency of Kapt, but there is no plugin of Kapt

The final solution:

Modify the configuration of app gradle.build to add the plugin kotlin-kapt, as follows:

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'kotlin-kapt'
}

Then confirm the three dependency dependencies related to room:

  implementation("androidx.room:room-runtime:2.4.3")
    annotationProcessor("androidx.room:room-compiler:2.4.3")
    kapt("androidx.room:room-compiler:2.4.3")