Hello! I have an already present multiplatform pro...

# multiplatform

[Sebastien Leclerc Lavallee]

Hello! I have an already present multiplatform project which I want to a ktor server module. I have a core multiplatform module like this:

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

version = "1.0.0"
java.sourceCompatibility = JavaVersion.VERSION_1_8
java.targetCompatibility = JavaVersion.VERSION_1_8

kotlin {
  js(IR) {
    browser()
  }

  jvm()

  sourceSets {
    val commonMain by getting {
      dependencies {
        implementation(kotlin("stdlib-common"))
        implementation(Deps.kotlinxSerialization)
      }
    }

    val commonTest by getting {
      dependencies {
        api("org.jetbrains.kotlin:kotlin-test")
      }
    }

    val jvmMain by getting
    val jvmTest by getting
    val jsMain by getting
    val jsTest by getting
  }
}

And now I did add this new ktor module

plugins {
  kotlin("jvm")
  kotlin("plugin.serialization")
  id("application")
}
version = "1.0.0"
java.sourceCompatibility = JavaVersion.VERSION_1_8
java.targetCompatibility = JavaVersion.VERSION_1_8

dependencies {
  implementation(kotlin("stdlib"))

  implementation(project(":core"))
  implementation("io.ktor:ktor-server-core:1.6.1")
  implementation("io.ktor:ktor-server-netty:1.6.1")
  implementation("io.ktor:ktor-serialization:1.6.1")
  implementation("ch.qos.logback:logback-classic:1.2.6")
}

application {
  mainClass.set("ca.sebleclerc.api.ApplicationKt")
}

When I execute ./gradlew server:run I get this error:

* What went wrong:
Could not determine the dependencies of task ':server:run'.
> Could not resolve all task dependencies for configuration ':server:runtimeClasspath'.
   > Could not resolve project :core.
     Required by:
         project :server
      > The consumer was configured to find a runtime of a library compatible with Java 8, packaged as a jar, preferably optimized for standard JVMs, and its dependencies declared externally, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm'. However we cannot choose between the following variants of project :core:
          - jvmRuntimeElements
          - ktlint
        All of them match the consumer attributes:
          - Variant 'jvmRuntimeElements' capability core:1.0.0 declares a runtime of a library, packaged as a jar, preferably optimized for standard JVMs, as well as attribute 'org.jetbrains.kotlin.platform.type' with value 'jvm':
              - Unmatched attributes:
                  - Doesn't say anything about how its dependencies are found (required its dependencies declared externally)
                  - Doesn't say anything about its target Java version (required compatibility with Java 8)
[... and so on]

I understand it can’t match anything that is produced by my core module but I can’t find anything to make it work. I did tried a few things but nothing worked… Anybody have any clue? Hint?

I am using Kotlin 1.6.20-M1

Thanks for the help 🙂

[Sebastian Sellmair [JB]]

Can you try disabling ktlint and report if this did change the situation?

[Sebastien Leclerc Lavallee]

Ok 🤔 I don’t have that error anymore … not sure what was wrong here…

[Sebastian Sellmair [JB]]

Hmm, ktlint is creating a Gradle configuration that probably is not set up, correctly. Therefore it's interfering with Gradle's variant aware resolution. Will look into ktlint and potentially consider contributing to fix this.

[Sebastian Sellmair [JB]]

You can work around by marking ktlint configurations as 'isCanBeConsumed' false

[Sebastian Sellmair [JB]]

Let me know if you would like to have further help here 😊

[Sebastien Leclerc Lavallee]

Not sure where I should put isCanBeConsumed

[Sebastian Sellmair [JB]]

Try putting this into your root build.gradle.kts

allprojects {
  configurations.matching { it.name == "ktlint" }.configureEach {
    isCanBeConsumed = false
  }
}

Note: this is just written from the back of my mind, not tested in any way.
If this does not work, or has any unintended side effects for you, then we could jump into a Google meet call to look into the problem, if you like! ☺️

[Sebastien Leclerc Lavallee]

Wow! The snippet worked like a charm! Thanks a lot @Sebastian Sellmair [JB]! 💪 👍

[Paul Woitaschek]

Thanks Sebastian, saved my live when integrating a Compose Desktop App with some multiplatform classes ❤️

[Paul Woitaschek]

Any idea what might be wrong in ktlint?
https://github.com/JLLeitschuh/ktlint-gradle/blob/master/plugin/src/main/kotlin/org/jlleitschuh/gradle/ktlint/Configurations.kt

[Sebastien Leclerc Lavallee]

Your clue will be as good as mine 😅 I’m far from a gradle expert

[Sebastien Leclerc Lavallee]

And glad I could be of any help! 🙂

[Paul Woitaschek]

Sorry I meant the SebastiAn 😅

[Sebastien Leclerc Lavallee]

Hahahahaha no worries 🙃 my bad 🤪

[Paul Woitaschek]

Apparently that’s already fixed upstream
https://github.com/JLLeitschuh/ktlint-gradle/issues/523
https://github.com/JLLeitschuh/ktlint-gradle/pull/571

But as the plugin is kinda abandoned it’s not released 🤷