In a Kotlin Multiplatform project using Kotlin 1.4.31 (JS with IR and JVM without IR) there are two modules (webClient, and server). The webClient module causes the Fritz2 Gradle plugin to break with the following error message appearing:

Task with name 'compileKotlinJs' not found in root project

. If the webClient module is renamed to js then the error disappears, however a warning message appears:

Duplicate content roots detected

Could you provide us some more information please? Can you post a link to a github repo, which can be used to reproduce this behaviour out of the box? Or at least some gist with the gradle build files within? I really can't figure out, how to reproduce this just with this few infos, nor what the cause and the solution might be.

Below are the contents of the build file:

group = "org.example"
version = "0.1-SNAPSHOT"

plugins {
    kotlin("multiplatform") version "1.4.31"
    id("dev.fritz2.fritz2-gradle") version "0.9"
    application
}

application {
    mainClass.set("io.ktor.server.netty.EngineMain")
}

repositories {
    mavenCentral()
}

kotlin {
    jvm("server") {
        dependencies {
            val ktorVer = "1.5.2"
            implementation("io.ktor:ktor-server-core:$ktorVer")
            implementation("io.ktor:ktor-server-netty:$ktorVer")
        }
        withJava()
    }

    js(name = "webClient", compiler = IR) {
        browser()
    }.binaries.executable()

    sourceSets {
        commonMain {
            dependencies {
                implementation("dev.fritz2:core:0.9")
            }
        }
    }
}

The problem with the first issue is, that we add a dependency to our kapt task by doing this in our gradle-plugin:

tasks.getByName("compileKotlinJs").dependsOn("kaptKotlinJvm")

When you change the name of the

js

or

jvm

multiplatform-target e.g. to

webClient

then this is not matching anymore... Therefore we need a more generic way to create this task-dependency with gradle. The second warning message comes from the line

withJava()

. When you remove that call the warning should disappear. This takes me some time to figure it out, but I don't know why this warning occours when using

withJava()

... ☹️

The

withJava

function is required in order to use the

application

Gradle plugin, which is used to run the Ktor based server. There doesn't appear to be a straightforward way to run the server, and have the Kotlin JS continuous feature running at the same time.

@napperley I can't confirm that. A while ago I had the same issues in my full-stack ktor example project https://github.com/jamowei/fritz2-ktor-todomvc and I successfully removed the

withJava

function there. The project works as expected without it and the warning of course disappers. Also, I don't use Java code in my project and therefore don't need the function

withJava

. As I understand it, it is there only for using Kotlin and Java together as described here.