Coroutines proguard rule causes duplicate classes

vishal.hemnani11 · September 26, 2019, 9:51pm

I have a library AAR that’s built after proguarding, and an app that depends on this library AAR.

The proguard rules specified for kotlinx-coroutines-core-

Kotlin/kotlinx.coroutines/blob/master/kotlinx-coroutines-core/jvm/resources/META-INF/proguard/coroutines.pro

# When editing this file, update the following files as well:
# - META-INF/com.android.tools/proguard/coroutines.pro
# - META-INF/com.android.tools/r8/coroutines.pro

# ServiceLoader support
-keepnames class kotlinx.coroutines.internal.MainDispatcherFactory {}
-keepnames class kotlinx.coroutines.CoroutineExceptionHandler {}

# Most of volatile fields are updated with AFU and should not be mangled
-keepclassmembers class kotlinx.coroutines.** {
    volatile <fields>;
}

# Same story for the standard library's SafeContinuation that also uses AtomicReferenceFieldUpdater
-keepclassmembers class kotlin.coroutines.SafeContinuation {
    volatile <fields>;
}

# These classes are only required by kotlinx.coroutines.debug.AgentPremain, which is only loaded when
# kotlinx-coroutines-core is used as a Java agent, so these are not needed in contexts where ProGuard is used.

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are causing kotlinx.coroutines.CoroutineExceptionHandler and kotlinx.coroutines.internal.MainDispatcherFactory names to be kept, causing duplicate class error while building the app-

Duplicate class kotlinx.coroutines.CoroutineExceptionHandler found in modules classes.jar (com.example.test:lib-android:0.0.1) and kotlinx-coroutines-core-1.3.2.jar (org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.2)
Duplicate class kotlinx.coroutines.internal.MainDispatcherFactory found in modules classes.jar (com.example.test:lib-android:0.0.1) and kotlinx-coroutines-core-1.3.2.jar (org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.2)

Is this expected or am I missing something? Any way to fix this issue?
Thanks.

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Coroutines proguard rule causes duplicate classes

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