Hi. When new multiplatform project is created (Linux machine),

iosMain

platform target is set to Multiplatform (screenshot bellow). That causes issues on Mac machine.

iosMain

cannot access platform code and have to duplicate code in

iosArm64Main

and

iosX64Main

. What platform target should be selected for

iosMain

on which

iosArm64

and

iosX64

depends on? Also, noticed that on Android Studio, using new KMM plugin,

iosMain

platform is set to multiple values Native(ios_arm64), Native(ios_x64). Is it possible to achieve the same on Intellij (platform target is single selection field)?

Hello! We’re deciding how do we want to include the shared KMM library into iOS (and Android, but it’s waaaay easier to decide). As I can see it, we can have three ways: 1. Deliver it as raw Kotlin code and have it as a separate Kotlin module in iOS and Android. Cons: adds compile time to the projects; requires the environment to have Kotlin in setup; in some cases requires minor alterations in client (I had to add Maven repo to a sample Android app in the new repo, but probably I’m just missing something) 2. Deliver via private Cocoapods repo (or private Maven for Android). Cons: we need to wait for the library to build before using it every time, similar approach for another project on our CI/CD takes 30 minutes; we need to create a new version number each time we push something into the Cocoapods repo 3. Deliver it as a pre-built (on CI/CD step) classes into submodules, which are then plugged into the projects. Cons: still not built immediately, can only be used after CI/CD is done What are the best practices here? How people usually use KMM without adding dependencies to developers’ environments and without long waits?

is there any tips and tricks for adding sources to multiplatform libs published to maven? i am using

maven-publish

to

mavenLocal()

but when using the library from a jvm project

libname-jvm

and navigate to definition idea is unable to attach sources it seems

hi all, happy monday! I'm attempting to use cocoapod dependencies in the shared module of a kotlin multiplatform mobile project and failing miserably. Full details in thread:

Is there any plan to add support for different constructor per platform with `expect`/`actual` mechanism? For example with Android and iOS, usually for Android there is a need to pass a context while for iOS there is no such thing. Currently I’m playing around with some

setup()

functions that initialize my object and I hide the real constructor from the client. This approach seems far from perfect though 🤔

Hey! have anyone faced this issue?

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':SharedCode:compileKotlinIos'.
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:205)
	at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:203)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:184)
	at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109)
	at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
	at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
	at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
	at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
	at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
	at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
	at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:372)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:359)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:352)
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:338)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
	at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
Caused by: org.jetbrains.kotlin.backend.konan.KonanCompilationException: Compilation finished with errors
	at org.jetbrains.kotlin.cli.bc.K2Native$Companion$mainNoExitWithGradleRenderer$1.invoke(K2Native.kt:277)
	at org.jetbrains.kotlin.cli.bc.K2Native$Companion$mainNoExitWithGradleRenderer$1.invoke(K2Native.kt:260)

i am passing lambdas to some native libraries (iOS) - do I need to freeze the lambda before passing it on? how would you mutate a lambda anyway? would calling it be considered mutation?

i have a kotlin multiplatform project that uses a kotlin-jvm project via gradle composite build. and i cannot run it:

```15:14:37: Executing task 'FetcherKt.main()'...

> Task :r2dbcfun:buildSrc:compileKotlin UP-TO-DATE
> Task :r2dbcfun:buildSrc:compileJava NO-SOURCE
> Task :r2dbcfun:buildSrc:compileGroovy NO-SOURCE
> Task :r2dbcfun:buildSrc:pluginDescriptors UP-TO-DATE
> Task :r2dbcfun:buildSrc:processResources NO-SOURCE
> Task :r2dbcfun:buildSrc:classes UP-TO-DATE
> Task :r2dbcfun:buildSrc:inspectClassesForKotlinIC UP-TO-DATE
> Task :r2dbcfun:buildSrc:jar UP-TO-DATE
> Task :r2dbcfun:buildSrc:assemble UP-TO-DATE
> Task :r2dbcfun:buildSrc:compileTestKotlin NO-SOURCE
> Task :r2dbcfun:buildSrc:pluginUnderTestMetadata UP-TO-DATE
> Task :r2dbcfun:buildSrc:compileTestJava NO-SOURCE
> Task :r2dbcfun:buildSrc:compileTestGroovy NO-SOURCE
> Task :r2dbcfun:buildSrc:processTestResources NO-SOURCE
> Task :r2dbcfun:buildSrc:testClasses UP-TO-DATE
> Task :r2dbcfun:buildSrc:test NO-SOURCE
> Task :r2dbcfun:buildSrc:validatePlugins UP-TO-DATE
> Task :r2dbcfun:buildSrc:check UP-TO-DATE
> Task :r2dbcfun:buildSrc:build UP-TO-DATE

FAILURE: Build failed with an exception.

* Where:
Initialization script '/private/var/folders/99/084s2g6s4pbgwr4_46ysxms80000gn/T/FetcherKt_main__.gradle' line: 27

* What went wrong:
A problem occurred configuring project ':r2dbcfun'.
> Could not create task ':r2dbcfun:FetcherKt.main()'.
   > SourceSet with name 'jvmMain' not found.

can i split a multiplatform project into multiple gradle subprojects, and have the jvm main be just a normal kotlin project that consumes the jvm build of the common module?

let me give this another shot. has anyone successfully managed to get external cocoapod dependencies working in a kotlin multiplatform project? i feel like i've followed the guide to a t with no luck. https://kotlinlang.slack.com/archives/C3PQML5NU/p1604348567259000

Hello everyone, I am really sorry for the ‘simple’ question, but I am quite new to KMM. I have one KMM App (like general utils library for both Android & iOS apps that I have) from Plugin in Android Studio. — How do I build both .jar & .framework to transfer them to my main project and where do they get saved? Thanks guys 🙂

Hi everyone 🙂 when using the Ktor client for authentication, is it possible to decode the JWT token payload in the common module (using pure Kotlin)*?*

Hello, I frequently have a problem that in MPP directory src/jvmMain/kotlin is not being recognized as source folder by IntelliJ. When inspecting Project structure I can see that src/jvmMain is being source root of 2 modules: main and jvmMain. Anyone knows a solution / workaround?

what's the best practice to write tests in a multiplatform 1.4.10 project? i am new to kotlin and gradle and fail to get testing setup

Hello, why it isn't possible to use the multiplatform plugin with

apply (plugin = ...)

but it is within the

plugins { }

block?

hello.. when I try using Int.countOneBits() in commonMain project I get this error: Task :y-collections:compileKotlinJvm FAILED, Unresolved reference: countOneBits. It’s weird because the function is there in NumbersJVM.kt, it delegates to the JVM function Integer.bitCount(this), any idea?

Hello, Using the Ktor HttpClient on Android and iOS.  I need to do some kind of json validation for authorization purposes… I am trying to create a 

Feature

 that parses the json, does the checking and then proceed with the response… The problem is that I cannot call 

readBytes

 twice. The second time it’s empty as the response has already been consumed when doing the validation. Is there any way to do it

I'm using the "packForXcode" Gradle task to build my shared library as a Framework. This works fine from Xcode when the Framework is not built yet or I don't change the build target in Xcode. But once I already have the Framework build for e.g. "iOS" and I switch to "iOS Simulator", build fails. It fails before even executing the script from Build Phases (it is put on the second position from top). Is there any solution for this? Currently I can only manually delete the Framework folder before building.

Hi guys, sorry for stupid question. I’ve seen multiple usages of

NSString.create(data = it, encoding = NSUTF8StringEncoding).toString()

and I cant find out how do you know about function name and definition. I have read on github kotlin native repo that those initializers are done via create factory but I cant find any documentation. Where can i find functions declarations please? I looked into platform.Foundation.NSString but I didn’t see

create

Hi everyone! Maybe someone can help me out with what are probably Multiplatform beginner questions... I just went through the Kotlin Multiplatform Hands-on: Networking and Data Storage tutorial. the Android build is running, but iOS crashes at startup. I've been double and triple checking everything but I cannot find anything I did wrong. Tbh, I also have trouble understanding what the stacktrace tells me (as in: Which of the mentioned classes in there is the origin of the problem):

Hey, Can I somehow have multiple threads using coroutines ? I know that in the documentation they say:

The current version of kotlinx.coroutines, which can be used for iOS, supports usage only in a single thread.

but supposedly there is a multithreded version

implementation ("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9-native-mt"){
    version {
        strictly("1.3.9-native-mt")
    }
}

I can’t seem to make it work though and in the iOS app Everything is still done on a single background thread.

https://kotlinlang.org/docs/reference/ Kotlin lastest version is 1.4.10. But I want refer to v1.3.72 docs, how do that? Help me. What link is kotlin old version docs?

with Kotlin

1.4.0

we can use

SharedFlow

. Is this supported from kotlin multiplatform native? in this example:

fun start() {
        actionsFlow.asSharedFlow().onEach { action ->
            when (action) {
                Action.Refresh -> refresh()
                Action.Load -> Unit
            }
        }.launchIn(coroutineScope)
    }

    suspend fun action(action: Action) {
        actionsFlow.emit(action)
    }

it works from Android but from iOS there are no events coming through the flow, the coroutineScope implementation (CustomMainScope) that I’m using for iOS is the following:

internal actual fun CustomMainScope(): CoroutineScope = CustomMainScopeImpl()

internal class CustomMainScopeImpl : CoroutineScope {
    private val dispatcher = MainDispatcher()
    private val job = Job()
    private val exceptionHandler = CoroutineExceptionHandler { _, throwable ->
        println("${throwable.message}: ${throwable.cause}")
    }

    override val coroutineContext: CoroutineContext
        get() = dispatcher + job + exceptionHandler
}

private class MainDispatcher : CoroutineDispatcher() {
    @Suppress("TooGenericExceptionCaught")
    override fun dispatch(context: CoroutineContext, block: Runnable) {
        dispatch_async(dispatch_get_main_queue()) {
            try {
                block.run()
            } catch (err: Throwable) {
                throw err
            }
        }
    }
}

and the dependency for iOS is:

"org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.0"

Is

SharedFlow

supposed to work on iOS even if its on a main thread?

I’m considering creating a multiplatform library using KMM. I would like to produce aar for Android and framework for iOS and then consume them in client apps which are developed as separate projects. Is this possible with KMM? Are there any guidelines on how to setup the project to produce proper binaries for both Android and iOS?

Hi. Trying to publish artifacts to local maven but getting weird error for Android target. When add this to android target

android {
    publishLibraryVariants("release", "debug")
}

I get error:

> Kotlin target 'android' tried to set up publishing for Android build variants that are not library variants or do not exist:
     * release
     * debug

But when I add

buildType

block to android configuration block like this:

android {
    ....
    buildTypes {
        val release by creating {
           isMinifyEnabled = false
        }
        val debug by creating {
            isDebuggable = true
        }
    }
}

I get error:

Please initialize at least one Kotlin target in 'kommon (:kommon)'.

Is there a guide or a sample project showing how to do CI (for example using github actions) setup (running tests for iOS/Android and common code, building iOS/Android apps etc) for a KMM project? I’ve done that for Android projects before but with KMM everything is in the same repo so I’m a bit confused.

I am trying to make a post request using Ktor HttpClient in commonMain on a singleThread using Dispatcher.Default and I am getting this exception on iOS

Uncaught Kotlin exception: kotlin.native.IncorrectDereferenceException: illegal attempt to access non-shared <object>@c1c6c8 from other thread
    at 0   shared                              0x000000010ac441bd kfun:kotlin.Throwable#<init>(kotlin.String?){} + 93 (/Users/teamcity/buildAgent/work/cae0e6559deed4c4/runtime/src/main/kotlin/kotlin/Throwable.kt:23:37)
    at 1   shared                              0x000000010ac3d0ab kfun:kotlin.Exception#<init>(kotlin.String?){} + 91 (/Users/teamcity/buildAgent/work/cae0e6559deed4c4/runtime/src/main/kotlin/kotlin/Exceptions.kt:23:44)
    at 2   shared                              0x000000010ac3d26b kfun:kotlin.RuntimeException#<init>(kotlin.String?){} + 91 (/Users/teamcity/buildAgent/work/cae0e6559deed4c4/runtime/src/main/kotlin/kotlin/Exceptions.kt:34:44)
    at 3   shared                              0x000000010ac7006b kfun:kotlin.native.IncorrectDereferenceException#<init>(kotlin.String){} + 91 (/Users/teamcity/buildAgent/work/cae0e6559deed4c4/runtime/src/main/kotlin/kotlin/native/Runtime.kt:30:36)
    at 4   shared                              0x000000010ac7438d ThrowIllegalObjectSharingException + 621 (/Users/teamcity/buildAgent/work/cae0e6559deed4c4/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt:98:11)
    at 5   shared                              0x000000010ad5a002 _ZN12_GLOBAL__N_128throwIllegalSharingExceptionEP9ObjHeader + 34
    at 6   shared                              0x000000010ad5e52e _ZNK27BackRefFromAssociatedObject3refEv + 78
    at 7   shared                              0x000000010ad44bd4 _ZN12_GLOBAL__N_111toKotlinImpEP11objc_objectP13objc_selectorPP9ObjHeader + 52
    at 8   shared                              0x000000010ad87c81 Kotlin_Interop_refFromObjC + 65
    at 9   shared                              0x000000010aff65ea _696f2e6b746f723a6b746f722d636c69656e742d696f73_knbridge28 + 330 (/opt/buildAgent/work/a85294440dc5c6e/ktor-client/ktor-client-ios/darwin/src/io/ktor/client/engine/ios/IosResponseReader.kt:100:14)
    at 10  shared                              0x000000010afff37a _696f2e6b746f723a6b746f722d636c69656e742d696f73_kncfun30 + 74
    at 11  CFNetwork                           0x00007fff22f31ade _CFNetworkHTTPConnectionCacheSetLimit + 207606
    at 12  Foundation                          0x00007fff25752d51 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
    at 13  Foundation                          0x00007fff25752c49 -[NSBlockOperation main] + 98
    at 14  Foundation                          0x00007fff25755bd6 __NSOPERATION_IS_INVOKING_MAIN__ + 17
    at 15  Foundation                          0x00007fff25751e49 -[NSOperation start] + 731
    at 16  Foundation                          0x00007fff25756530 __NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 17
    at 17  Foundation                          0x00007fff2575603a __NSOQSchedule_f + 182
    at 18  libdispatch.dylib                   0x000000010b75a3c9 _dispatch_block_async_invoke2 + 83
    at 19  libdispatch.dylib                   0x000000010b74bd48 _dispatch_client_callout + 8
    at 20  libdispatch.dylib                   0x000000010b759de6 _dispatch_main_queue_callback_4CF + 1500
    at 21  CoreFoundation                      0x00007fff23bd4049 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
    at 22  CoreFoundation                      0x00007fff23bceca9 __CFRunLoopRun + 2329
    at 23  CoreFoundation                      0x00007fff23bce066 CFRunLoopRunSpecific + 438
    at 24  GraphicsServices                    0x00007fff384c0bb0 GSEventRunModal + 65
    at 25  UIKitCore                           0x00007fff48092d4d UIApplicationMain + 1621
    at 26  iosApp-sample                       0x000000010a8b905b main + 75 (/User/iosApp-sample/iosApp-sample/AppDelegate.swift:4:7)
    at 27  libdyld.dylib                       0x00007fff5227ec25 start + 1

This is what my implementation looks like

fun postRequest() {
        MainScope().launch {
            withContext(Dispatchers.Default) {
                 HttpClient().post("URL"){
                   body = "some json"
                 }
            }
        }
    }

This request is working fine for the Android application and only throws the exception in iOS. Also if I try to run HttpClient().post on the main thread, it works fine on iOS and I am successfully able to send the request. ktorVersion = "1.4.1" coroutinesVersion = "1.3.9-native-mt-2" Based on this documentationhttps://github.com/Kotlin/kotlinx.coroutines/blob/native-mt/kotlin-native-sharing.md#switching-threads for

"1.3.9-native-mt-2"

my understanding is it should work. Any help is appreciated!

does anyone have suggestions for a multiplatform friendly

BigInteger

type of class?