Hey, everyone, I am a little stuck trying to updat...

# android

[Steve C]

Hey, everyone, I am a little stuck trying to update an android jetpack compose app from a few years ago. It is using KSerializer for a custom serializer, and that wants to include compose-preview-renderer:0.0.1-alpha01, but that causes a duplicate class found error with kotlin-stdlib-1.9.0. What would I need to do to resolve this duplicate class error?

[Saud Khan]

Can you post the error log? Was the Kotlin Serialisation library also updated?

[Steve C]

Caused by: java.lang.RuntimeException: Duplicate class _COROUTINE.ArtificialStackFrames found in modules compose-preview-renderer-0.0.1-alpha01 (com.android.tools.composecompose preview renderer0.0.1-alpha01) and kotlinx-coroutines-core-jvm-1.7.3 (org.jetbrains.kotlinxkotlinx coroutines core jvm1.7.3)

[Saud Khan]

Can you provide the full stacktrace of the exception? I understand that the issue is the conflict, but serialization library does not include anything compose related to trying to understand where com.android.tools.compose:compose-preview-renderer:0.0.1-alpha01 is being picked up from.

[Steve C]

• appdexBuilderDebug
• org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
• java.lang.RuntimeException: Duplicate class _COROUTINE.ArtificialStackFrames found in modules compose-preview-renderer-0.0.1-alpha01 (com.android.tools.composecompose preview renderer0.0.1-alpha01) and kotlinx-coroutines-core-jvm-1.7.3 (org.jetbrains.kotlinxkotlinx coroutines core jvm1.7.3)
• org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.tasks.MergeJavaResWorkAction
• com.android.builder.merge.DuplicateRelativeFileException: 2 files found with path 'kotlin/reflect/reflect.kotlin_builtins'.
• Duplicate class found

[Steve C]

Caused by: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable

[Steve C]

Caused by: java.lang.RuntimeException: Duplicate class _COROUTINE.ArtificialStackFrames found in modules compose-preview-renderer-0.0.1-alpha01 (com.android.tools.composecompose preview renderer0.0.1-alpha01) and kotlinx-coroutines-core-jvm-1.7.3 (org.jetbrains.kotlinxkotlinx coroutines core jvm1.7.3)

[Steve C]

Caused by: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.tasks.MergeJavaResWorkAction

[Steve C]

Caused by: com.android.builder.merge.DuplicateRelativeFileException: 2 files found with path 'kotlin/reflect/reflect.kotlin_builtins'.

[Steve C]

dependencies {
implementation(libs.androidx.core.ktx)
implementation(libs.androidx.lifecycle.runtime.ktx)
implementation(libs.androidx.activity.compose)
implementation(platform(libs.androidx.compose.bom))
implementation(libs.androidx.ui)
implementation(libs.androidx.ui.graphics)
implementation(libs.androidx.ui.tooling.preview)
implementation(libs.androidx.material3)
implementation(libs.androidx.appcompat)
implementation(libs.androidx.constraintlayout.compose)
implementation(libs.compose.preview.renderer)
testImplementation(libs.junit)
androidTestImplementation(libs.androidx.junit)
androidTestImplementation(libs.androidx.espresso.core)
androidTestImplementation(platform(libs.androidx.compose.bom))
androidTestImplementation(libs.androidx.ui.test.junit4)
debugImplementation(libs.androidx.ui.tooling)
debugImplementation(libs.androidx.ui.test.manifest)
}

[Steve C]

I'm using KSerializer, and android studio suggests adding this dependency: implementation(libs.compose.preview.renderer) and when it does it also adds this import kotlinx.serialization.KSerializer

[Steve C]

Once that happens, the build compiles, but it gives the errors above when I try to run the app.

[Steve C]

Is KSerializer deprecated now, or should it be coming from a different dependency instead of the libs.compose.preview.renderer one?

[Saud Khan]

You should be using the KSerializer from Kotlinx serialization: https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#custom-serializers

[Steve C]

Thank you! I ended up with this: Project build.gradle.kts:

plugins {
    ...    
    kotlin("plugin.serialization") version "1.9.0" apply false
}

Module build.gradle.kts:

plugins {
    ...
    kotlin("plugin.serialization")
}
...
dependencies {
    ...
    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.0")
}

[Steve C]

It all compiles and runs now, thank you for your help, Saud!