This might be a lazyweb question at this point, but is it really not possible to run `main` function...

# multiplatform

[Zac Sweers]

This might be a lazyweb question at this point, but is it really not possible to run main functions from jvmMain sources in KMP projects? I’ve seen a bunch of past threads referring to both compose.application.desktop.mainClass and kotlin.jvm.mainRun.mainClass, but none of them ever seem to actually be resolved or support invocation from the IDE. This seems like a big missing piece for debugging if the only way to run with the necessary application classes bundled is via command line/`./gradlew run`

[jw]

jvm().withJava() + application.mainClass working fine here

[Zac Sweers]

withJava() is required?

[jw]

For the application plugin, yes

[Zac Sweers]

as in the gradle application plugin?

[jw]

Yep

[jw]

Presumably I don't need either and can just click play on main() though?

[Zac Sweers]

brb need to remove all the android targets then for this to work

[jw]

yeah i don't have Android

[Zac Sweers]

hmm, how are you applying the application plugin? Seems KMP generates conflicting tasks

A problem occurred configuring root project 'field-spottr-root'.
> Cannot add task 'run' as a task with that name already exists.

[jw]

https://github.com/JakeWharton/mosaic/blob/trunk/samples/counter/build.gradle

[Zac Sweers]

¯\_(ツ)_/¯

[Zac Sweers]

still get the same issue re: it not bundling the whole classpath

Exception in thread "main" java.lang.NoClassDefFoundError: androidx/collection/ScatterMapKt
	at androidx.compose.runtime.collection.ScopeMap.<init>(ScopeMap.kt:26)
	at androidx.compose.runtime.CompositionImpl.<init>(Composition.kt:479)
	at androidx.compose.runtime.CompositionImpl.<init>(Composition.kt:434)
	at androidx.compose.runtime.CompositionKt.Composition(Composition.kt:335)
	at androidx.compose.ui.window.Application_desktopKt$awaitApplication$2$1$2.invokeSuspend(Application.desktop.kt:219)
	...

[eygraber]

In the IDE you should be able to just click the green play button without the application plugin. Is that what produces that stacktrace above?

[eygraber]

Also I'm pretty sure if you set the mainClass (example here), the IDE adds a run configuration for it (but maybe that actually happens when I click the play button; I never actually checked that).

[Zac Sweers]

that is indeed what produces the stacktrace above

[Zac Sweers]

maybe it’s a specific issue with compose desktop

[eygraber]

What version of CMP / AS / IDEA are you on? It works for me.

[Zac Sweers]

1.6.11, studio koala latest canary

[Zac Sweers]

Sadly IJ’s lagging Android support requires using studio

[eygraber]

I'm on latest Jellyfish, but it's been working for a while, so I doubt that's it.

You can try running the sample I linked above and see what happens with that.

[jw]

I'm in IDEA 2024.2 EAP 3