Hi! I have a multiplatform module containing a server, with one kotlin multiplatform dependency modu...

# multiplatform

[Philip Dukhov]

Hi! I have a multiplatform module containing a server, with one kotlin multiplatform dependency module . Running it from main function with play button produces following error:

Error: Could not find or load main class com.well.server.ApplicationKt

I’ve found a solution to run it, using following task:

task<JavaExec>("run") {
main = "com.well.server.ApplicationKt"
val jvm by kotlin.targets.getting
val main: KotlinCompilation<KotlinCommonOptions> by jvm.compilations
val runtimeDependencies = (main as KotlinCompilationToRunnableFiles<KotlinCommonOptions>).runtimeDependencyFiles
classpath = files(main.output.allOutputs, runtimeDependencies)
}

One of the minuses - I can’t debug server and run an other module, because server starts running as part of task, and task progress remains 92 until I abort it.

Is there a better solution?

But the main goal right now is to deploy the server. Following the official guide, I tried this code:

tasks.create("stage") {
dependsOn(tasks.getByName("installDist"))
}

application {
mainClassName = "ApplicationKt"
}

distributions {
main {
contents {
from("$buildDir/libs") {
rename("${rootProject.name}-jvm", rootProject.name)
into("lib")
}
}
}
}

tasks.getByName<JavaExec>("run") {
`classpath(tasks.getByName<Jar>("jvmJar")) // so that the JS artifacts generated by jvmJar can be found and served`
}

But ./gradlew :server:run returns Could not find or load main class ApplicationKt error, and :server:jvmJar finishes without errors but doesn’t seems to produce the output

[Big Chungus]

Can you send us your main function? Play button should work!

[Philip Dukhov]

@Big Chungus I’ve created a sample project. file with the main function: https://github.com/PhilipDukhov/KMP-server-test/blob/main/server/src/jvmMain/kotlin/com/well/server/Application.kt

[Big Chungus]

Looks like IDEA is not picking up your custom resources folder. Can you try moving it to src/jvmMain/resources?

[Philip Dukhov]

done, but result is the same error🤔

[Big Chungus]

Aaaaaah! I remember having the same. I know what's up 😄

[Big Chungus]

In build.gradle.kts add withJava() in kotlin { jvm {} }

[Big Chungus]

Then you'll be able to run it with both, ./gradlew run and play button

[Philip Dukhov]

tried it too, still `Could not find or load main class`😞

[Big Chungus]

Damn!

[Big Chungus]

Ok, managed to get ./gradlew run working by adding

application {
    mainClassName = "io.ktor.server.netty.EngineMain"
}

to gradlefile

[Big Chungus]

With the above, this also works for me

[Philip Dukhov]

what have you changed in the config? I see no difference with a default one, and it still doesn’t work for me. have you changed main class? I tried specifying io.ktor.server.netty.EngineMain in the config, and it says Neither port nor sslPort specified . yet running ./gradlew run indeed works

[Big Chungus]

Did you make sure to select correct module in Run Configuration dialog?

[Big Chungus]

i.e. jvmMain?

[Big Chungus]

I've also had issues importing the project into INTELLIJ due to android versions, so I've commented out //include(":app") in settings.gradle.kts

[Philip Dukhov]

Jesus, it’s really related to android module somehow😱 I’ve pushed fix so you can build it in INTELLIJ without disabling the app module..

[Big Chungus]

Works fine for me now

[Big Chungus]

Add me as contributor to that repo (mpetuska) an I'll raise a PR on what's different on my end

[Big Chungus]

Unless it works for you too

[Philip Dukhov]

https://github.com/PhilipDukhov/KMP-server-test/invitations

[Big Chungus]

https://github.com/PhilipDukhov/KMP-server-test/pull/1

[Philip Dukhov]

have you run sync after un-committing app? I just tried on your commit and it works only with the committed app module.

[Big Chungus]

i did

[andylamax]

https://github.com/aSoft-Ltd/konfig/blob/master/samples/multiplatform-sample/build.gradle.kts

[Big Chungus]

Try re-importing it to intellij? i.e. remove .idea and go through import from existing sources again

[Big Chungus]

Or just plain opening

[andylamax]

build.gradle.kts

plugins {
  kotlin("multiplatform")
  id("tz.co.asoft.application") version "0.0.7"
}

konfig {
  debug(
    "Main-Class" to "io.ktor.server.netty.EngineMain"
  )
}

after that you can just run ./gradlew jvmRunDebug

[Philip Dukhov]

I tried cleaning .idea and build folders, as well as cloning repo from scratch, still Could not find or load main class if android module is enabled, and works if disabled.. also even if it works(without android module), running executable created with :distZip fails with Neither port nor sslPort specified .. tried specifying port as a param, it says No configuration setting found for key 'ktor' Why can it ignore application.conf?

[Philip Dukhov]

@andylamax thanks, lib looks pretty interesting, I’ll check it out later, but for now I’d like to run project without extra dependencies.

[andylamax]

You don't have to add any dependencies if you are not using the konfigs. Only the gradle plugin to run the application

[Big Chungus]

I'm on eap intellij. Maybe try upgrading your idea and make sure to run gradle commands via wrapper?

[Big Chungus]

Also, try clearing your maven and gradle caches

[Philip Dukhov]

ok, it works on EAP😁 any idea how to fix the distribution? running executable created with :distZip  fails with Neither port nor sslPort specified .. tried specifying port as a param, it says  No configuration setting found for key 'ktor'  Why can it ignore application.conf ?

[Big Chungus]

No clue never used that. Try applying shadow plugin to get fat jar instead

[Philip Dukhov]

Thanks for help, man!

[Big Chungus]

Np, glad you got this sorted