Kotlinx.coroutines: java.lang.IllegalStateException: Module with the Main dispatcher is missing. Occurs for AWS device farm

[int-mszczepanik]

For all devices in Amazon Web Service Device Farm we see crash evan for basi Android app which is using corutines 1.0.1 (implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1'). This totally block our ui testing

Caused by: java.lang.IllegalStateException: Module with the Main dispatcher is missing. Add dependency providing the Main dispatcher, e.g. 'kotlinx-coroutines-android'
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.MissingMainCoroutineDispatcher.missing(Dispatchers.kt:123)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.MissingMainCoroutineDispatcher.dispatch(Dispatchers.kt:116)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.DispatchedKt.resumeCancellable(Dispatched.kt:282)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:23)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:109)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:160)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:54)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.BuildersKt.launch(Unknown Source:1)
11-21 07:47:17.723 10755 10755 E AndroidRuntime:    at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:47)

[qwwdfsad]

Android (and especially new androidx toolchain) is a complicated beast, please provide additional information along with report:

All dependencies versions (androidx, API level, other dependencies etc.), whether R8 or Proguard is used and its version. E.g. have you added coroutines proguard rules (https://github.com/Kotlin/kotlinx.coroutines#r8-and-proguard)?

What even better is to provide a sample project which consistently crashes.

[int-mszczepanik]

It occurs for:

• Google Pixel (7.1.2)
• Google Pixel 2 (8.0.0)
• Samsung Galaxy S6 (T-Mobile) (6.0.1)
• Samsung Galaxy S9 (Unlocked) (8.0.0)
• Samsung Galaxy Tab 4 10.1" (WiFi) (4.4.2)

All these devices are in AWS device farm and only there this issue was seen.
I cannot reproduce it on my device (Google Pixel 2 (9.0)) and . It also not occurs for experimental versions of corutines

It is crashing even for code like that:

class MainActivity : AppCompatActivity(), CoroutineScope {

private val job = Job()
override val coroutineContext: CoroutineContext = job + Dispatchers.Main

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        launch {
            val profile = "test"
            val number = " ${getProfile()}"
            Toast.makeText(applicationContext, profile+number, Toast.LENGTH_LONG).show()
        }
    }

    private suspend fun getProfile(): Int {
        return withContext(Dispatchers.IO) {
            delay(100)
            10
        }
    }
}

[qwwdfsad]

Are you using R8 or ProGuard?

[int-mszczepanik]

No, It occurs even for debug version without R8 and Proguard

[qwwdfsad]

Could you please attach a self-contained project which I can run on AWS farm and that will crash?
Just to be sure that I'm debugging the problematic pattern of usage

[int-mszczepanik]

You can find it here: https://github.com/int-mszczepanik/SampleAppForDeviceFarm

it crashes even when I run it manually via remote sessions on AWS (Samsung S5 (4.4.4)

[edgar-zigis]

This bug was also persistent for me, even not on AWS device. I fixed it by adding an additional line into my gradle file:

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1'

Before, my gradle only contained a core library, but by adding android coroutine library this error was fixed. I see that in your sample project you have imported only android coroutine library, so add core lib too. It may fix the problem.

[int-mszczepanik]

With core or without same error occurs on AWS device farm (tested for 1.0.1 and 1.0.0) BTW Android include dependency to core lib as I know and it is important to have same version for both libraries.

[Piste]

@qwwdfsad what would be the next step towards fixing this issue?

[psteiger]

I also have this problem with AWS device farm. No Proguard.

[npike]

We are also having this problem on AWS device farm with a debug (no proguard) build of an APK.

[Piste]

I spoke to Device Farm Support and they indicated that Kotlin is not supported.

[elizarov]

It the problem still actual?

[kuno]

We have same issue on out app, which only happends on Pixel and Samsung devcies so far.

[erickok]

Make sure you are not stripping the meta-inf in your build. That's almost
certainly the problem.

On Thu, 26 Sep 2019, 08:13 kuno, [e-mail] wrote:

We have same issue on out app, which only happends on Pixel and Samsung
devcies so far.

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