I am getting this error, even though I included the "kotlinx-coroutines-core" in the commonMain and ...

# compose-desktop

[Daniele B]

I am getting this error, even though I included the "kotlinx-coroutines-core" in the commonMain and the "kotlinx-coroutines-swing" in the jvmMain block of the shared gradle file:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Module with the Main dispatcher is missing. Add dependency providing the Main dispatcher, e.g. 'kotlinx-coroutines-android' and ensure it has the same version as 'kotlinx-coroutines-core'
	at kotlinx.coroutines.internal.MainDispatchersKt.throwMissingMainDispatcherException(MainDispatchers.kt:77)
	at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.missing(MainDispatchers.kt:108)
	at kotlinx.coroutines.internal.MissingMainCoroutineDispatcher.isDispatchNeeded(MainDispatchers.kt:92)
	at kotlinx.coroutines.internal.DispatchedContinuationKt.resumeCancellableWith(DispatchedContinuation.kt:315)
	at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable(Cancellable.kt:26)
	at kotlinx.coroutines.intrinsics.CancellableKt.startCoroutineCancellable$default(Cancellable.kt:21)
	at kotlinx.coroutines.CoroutineStart.invoke(CoroutineStart.kt:88)
	at kotlinx.coroutines.AbstractCoroutine.start(AbstractCoroutine.kt:123)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch(Builders.common.kt:52)
	at kotlinx.coroutines.BuildersKt.launch(Unknown Source)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.launch$default(Builders.common.kt:43)
	at kotlinx.coroutines.BuildersKt.launch$default(Unknown Source)

any idea how to solve this?

[Garret Yoder]

On desktop you need to provide a dispatcher based on what you want to use (swing/jfx)

for example - kotlinx-coroutines-jvm = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-swing", version.ref = "coroutines" }

[Daniele B]

I have added "kotlinx-coroutines-swing" already, but I get this error

[Garret Yoder]

where do you have that added?

[Daniele B]

I added in the gradle file of the shared module

[Garret Yoder]

is your project desktop only or multiplatform? If so, you need to add it for the jvm configuration.

[Daniele B]

it's a multiplatform project, and I am using coroutines only in the shared module

[Daniele B]

I found the problem!
I had created an extra dependencies block in the JVM!!!

[Daniele B]

my fault!

[albrechtroehm]

Is this working for you with compose-multiplatform > 1.5.11? When i tried to update last time i had similar issues but did not had the time to dig in too much

[Daniele B]

I am using Compose Multiplatform 1.6.1. It works good. It was just my mistake.

[albrechtroehm]

Hmm really strange, I'm seeing this only when updating to 1.6.0 and I already have swing coroutines in my desktopMain block. Would you mind posting some more of your gradle file?

[albrechtroehm]

Looks like Dispatchers.Main is not ideal to be used.
After changing to Dispatchers.Default everything was fine again 🙂 I created this open class to use coroutines in ViewModels very similar to android, but maybe thats not the best idea 🤷

open class ViewModel {
    protected val viewModelScope = CoroutineScope(Dispatchers.Default + SupervisorJob())
}

[Pedro Romano Barbosa]

@Daniele B I'm also using Compose Multiplatform 1.6.1. Where did you insert the coroutines swing dependency?

desktopMain.dependencies { ... }

Here?

[Daniele B]

@Pedro Romano Barbosa yes, exactly