kotlinlang #multiplatform

do you know if these libraries are supervised directly by the Firebase team? https://firebaseopensource.com/projects/gitliveapp/firebase-kotlin-sdk do you have experience working with these libraries? are they the best you can find for Firebase in Kotlin Multiplatform?

saket

08/16/2020, 9:07 PM

Huh, changing my IDE plugin to 1.4.0-rc fixes the problem.

Thomas Skovsgaard

08/17/2020, 5:52 AM

Hi, I'm trying to use swiftUI and KMP together, my viewmodels are shared between android and iOS, but I can't seem to figure out how to respond to changes in swiftUI, when my viewmodel is using StateFlow. Has anyone had any luck with that ?

👀 1

gregorbg

08/17/2020, 9:36 PM

Hey! Are there any good resources on how to split different multiplatform targets into different Gradle modules/projects? I have an existing Gradle build with

projectRoot/frontend

(JS) and

projectRoot/backend

(JVM) as individual modules and I'd like to migrate to Kotlin without changing the project structure too much

Ricky

08/18/2020, 3:17 AM

Would it be possible to use KMP as multi-project style? like

common/
- src/
- build.gradle.kts
jvm/
- src/
- build.gradle.kts
js/
- src/
- build.gradle.kts

src/
- commonMain
- jvmMain
- jsMain
build.gradle.kts

I need to use two plugins (that conflict with each other), if I have it as multi-project I can apply each plugin for the associated target

Ricky

08/18/2020, 3:19 AM

Also, would it be possible to have a jvm common? since the entire project would be in jvm only.

bod

08/18/2020, 11:41 AM

Hello, World! So I'm trying to re-open a MP project that I've not opened for a few months... And I get:

There are 33 third-party libraries attached to the project that were compiled with an older Kotlin/Native compiler and cant be read in IDE

and almost everything is red in the IDE. I've tried to update all my dependencies to their latest versions, but this didn't improve the situation. Is that normal?

Kathrin Petrova

08/18/2020, 2:18 PM

Hey everyone! My name is Kate, and I’m the new developer advocate for Kotlin Multiplatform Mobile. I’d be happy to help you dig into KMM and chat about your experience with KMM anytime. As you know, we’ve just released Kotlin 1.4! 🥳To help you start using the new features of Kotlin multiplatform in existing projects, we've published the migration guide for multiplatform projects. We’ll be very grateful if you report any bugs you find to our issue tracker.

👋 14

❤️ 1

🎉 21

kai widmer

08/18/2020, 2:35 PM

hi everyone, currently I'm receiving an error while building android/ios multiplatform-project:

FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':shared:compileKotlinIos'.
> java.lang.ClassNotFoundException: org.jetbrains.kotlin.cli.utilities.MainKt

gradlew --version:

------------------------------------------------------------
Gradle 6.5.1
------------------------------------------------------------

Build time:  2020-06-30 06:32:47 UTC
Revision:   66bc713f7169626a7f0134bf452abde51550ea0a

Kotlin:    1.3.72
Groovy:    2.5.11
Ant:     Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:     1.8.0_242-release (JetBrains s.r.o 25.242-b3-6222593)
OS:      Mac OS X 10.15.6 x86_64

Did anybody have a similar problem?

John O'Reilly

08/18/2020, 3:45 PM

Kotlinx Coroutines

1.3.9-native-mt

version now available https://github.com/Kotlin/kotlinx.coroutines/issues/462#issuecomment-675553478

Ricky

08/18/2020, 7:51 PM

Is there a way to use KMP like this? having expect/actual would be really useful for this project.

🇳🇴 2

edenman

08/19/2020, 2:23 AM

I have a

KClass<T>

and I would like to get a corresponding `KType`….

KClass.createType

is JVM-only, anybody know if there’s a KMP way to do this?

Sergei Novikov

08/19/2020, 6:57 AM

Hi everyone, can you please tell me if it is possible to use Retrofit in a MP library?

nrobi

08/19/2020, 10:16 AM

Shouldn’t

withContext(Dispatchers.Default)

work with coroutines

1.3.8-native-mt-1.4.0-rc

on iOS as well? I’m getting There is no event loop. Use runBlocking { ... } to start one.

tylerwilson

08/19/2020, 2:44 PM

How is there no common String.format yet? 😞

Nick

08/19/2020, 3:39 PM

Has anyone been able to get a j2objc library to work on multiplatform? I’m importing the library using cocoapods.

xcodebuild

fails to build the Pods.xcodeproj with error 65.

** BUILD FAILED **
The following build commands failed
CompileC [long dir]/AbstractQuoteEventSchema.o [long dir]/AbstractQuoteEventSchema.m normal arm64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
CompileC [long dir]/AccountBalanceMessageHandler.o [long dir/AccountBalanceMessageHandler.m  normal arm64 objective-c com.apple.compilers.llvm.clang.1_0.compiler

Evan

08/19/2020, 9:43 PM

does anyone know how the kotlin targets

androidTest

and

androidAndroidTest

interact? I can’t run instrumentation tests unless I comment out `androidTest`’s dependencies due to a duplicate class exception. Also, my

androidTest

unit tests don’t pass if I have dependencies in

androidAndroidTest

, but they pass once I comment the instrumentation dependencies out.

👀 1

hultgren

08/20/2020, 1:36 AM

When migrating my MP project to kotlin 1.4 I ran into a problem with publishing android artifacts. This:

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

used to work fine but after migrating I get this error:

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

* release

* debug

Check the 'publishLibraryVariants' property, it should point to existing Android library variants. Publishing of application and test variants is not supported.

Replacing above with

publishAllLibraryVariants()

does build, but it publishes no android artifacts. Anyone else seen this?

Oleh

08/20/2020, 8:52 AM

Hey guys, anyone has migrated successfully MPP project that uses ktor to 1.4? I’m receiving

Could not resolve io.ktor:ktor-client-json-native:1.4.0.

all the time. When I setup only

core

dependency, android/ios client doesn’t appear there.

ribesg

08/20/2020, 11:51 AM

Quick question, when documenting

expect

actual

things, do you need to copy the KDoc on each

actual

on each platform or is documenting

expect

enough? I’m talking mostly from a IDEA-picking-it-up point of view

Kris Wong

08/20/2020, 2:33 PM

does anyone know whether 1.4 supports macOS Arm64?

Erik Christensen

08/21/2020, 3:36 AM

Is anyone aware of (or working on) a compiler plugin that can automatically rename test methods with nice back tick names to valid names on the platforms that don't support them, like JS? Basically, applying

JsName()

without having to do it by hand.

Tristan

08/21/2020, 1:44 PM

Hello, I just started a new project through the wizard and I am getting a lot of highlights in my gradle file. Do you have an idea of how I could fix it?

Marcin Bak

08/21/2020, 2:44 PM

Hi, I have two gradle modules in my project: •

shared-library

(kmp targeting jvm, js and ios) with just 1 class in commonMain •

jvmApp

(simple jvm module) with dependency to shared-library

implementation(project(path = ":shared-library"))

For some reason

jvmApp

module doesn’t see the class defined in shared-library Any ideas what I could be doing wrong?

Wolf Logan

08/21/2020, 5:51 PM

I'm running into an internal compiler error while trying to migrate my project to Kotlin 1.4. I have a Kotlin Multiplatform project (Gradle w/Kotlin dialect) building for two targets (JS and JVM); the JVM target uses Spring Boot 2.2.6. With the project configured to use the 1.3.72 plugin, everything builds fine. Moving to the 1.4.0 plugin (and updating Kotlin library references to 1.4.0) causes the build to fail with the error below:

FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileKotlinJvm'.
> Internal compiler error. See log for more details
 . . .
/xxx/xxx/xxx.kt:57
  @PutMapping("/{userId}", consumes = [MediaType.APPLICATION_JSON_VALUE])
                                      ^
e: org.jetbrains.kotlin.util.KotlinFrontEndException: Exception while analyzing expression at (57,39) in /xxx/xxx/xxx.kt
	at org.jetbrains.kotlin.types.expressions.ExpressionTypingVisitorDispatcher.logOrThrowException(ExpressionTypingVisitorDispatcher.java:253)
 . . .
Caused by: java.lang.NoSuchMethodError: kotlin.sequences.SequencesKt.flatMapIterable(Lkotlin/sequences/Sequence;Lkotlin/jvm/functions/Function1;)Lkotlin/sequences/Sequence;
	at org.jetbrains.kotlin.resolve.calls.components.CollectionTypeVariableUsagesInfo.getDependentTypeParameters(ResolutionParts.kt:364)

Carter

08/21/2020, 8:26 PM

I’m running into trouble with Kotlin 1.4, multiplatform, and serialization. I’m getting the warning “The Kotlin Gradle plugin was loaded multiple times in different subprojects”. It seems to be due to the fact that I have a library module that declares using the serialization plugin, and then that library module is consumed by an application module. Is there something incorrect in my setup? Library module declares:

plugins {
    kotlin("multiplatform")
    kotlin("plugin.serialization")
}

App module, which depends on library module, declares:

plugins {
    kotlin("multiplatform")
    id("application")
}

My settings.gradle.kts declares:

pluginManagement {
    plugins {
        kotlin("multiplatform") version("1.4.0")
        kotlin("plugin.serialization") version("1.4.0")
    }
}

takahirom

08/22/2020, 8:18 AM

This is just interesting, can I use Kotlin multiplatform implementation from go lang or rust? Do you have a plan for it?

oshai

08/23/2020, 12:16 PM

Hi, does anybody know of an issue with KMP 1.4 support for

artifactId

? It looks like it ignores that directive in the jar name

Marc Knaup

08/23/2020, 3:53 PM

Is there an idiomatic way to memoize values that works multiplatform (and esp. across threads in Native)? E.g.

private val hash: Int by lazy { … }

but

lazy

doesn’t work across threads in Native afaik.

Marc Knaup

08/23/2020, 7:59 PM

This is weird. I have two libraries: (A) multiplatform library with JVM target +

withJava()

(B) multiplatform library with JVM target that depends on (A) - (no

withJava()

) If I add my java sources folder to the Kotlin JVM target of (A), then (A) compiles successfully but (B) can’t see the Java symbols. If I add my java sources folder to the entire project (just like in a normal Java project) of (A) then (A) doesn’t see the symbols but (B) does. If I specify the source set configuration for both in (A), i.e. in the Kotlin JVM target AND in the Java project, then it works fine in both 🤔 What’s the right way to set that up?

Title

Marc Knaup

08/23/2020, 7:59 PM

This is weird. I have two libraries: (A) multiplatform library with JVM target +

withJava()

(B) multiplatform library with JVM target that depends on (A) - (no

withJava()

Dominaezzz

08/23/2020, 8:31 PM

Are you using the

java

folder or the

kotlin

folder?

Marc Knaup

08/23/2020, 8:32 PM

Neither, I have to add my own source directories.

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