I've got an old project that I'm trying to migrate...

# gradle

[David Herman]

I've got an old project that I'm trying to migrate over to use the new experimental jvm binaries DSL, and although I'm essentially writing code identical to the example at https://kotl.in/jvm-binaries-dsl it doesn't seem to pick up the main class I'm setting.

[David Herman]

My build script so far in its entirety is:

import org.jetbrains.kotlin.gradle.ExperimentalKotlinGradlePluginApi

plugins {
    alias(libs.plugins.kotlin.multiplatform)
}

group = "dev.bitspittle.kross2d.examples.sprite"
version = "0.0.1"

kotlin {
    @OptIn(ExperimentalKotlinGradlePluginApi::class)
    jvm { binaries { executable { mainClass.set("SpriteRunnerKt") } } }
    js { browser { binaries.executable() } }
    sourceSets {
        commonMain.dependencies {
            api("dev.bitspittle.kross2d:kross2d")
        }
    }
}

where libs.version.toml is:

[versions]
kotlin = "2.2.10"

[plugins]
kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }

so, nothing crazy.

[David Herman]

SpriteRunner.kt does indeed exist in jvmMain at the top level and looks like this:

import dev.bitspittle.kross2d.core.math.Vec2
import dev.bitspittle.kross2d.engine.app.AppParams
import dev.bitspittle.kross2d.engine.app.launch

fun main() {
    val screenSize = Vec2(640, 480)
    launch(
        AppParams("Sprite", screenSize),
        initialState = SpriteState())
}

[David Herman]

When I run ./gradlew :sprite:jvmRun however, I get:

Execution failed for task ':sprite:jvmRun'.
> No main class specified and classpath is not an executable jar.

But when I run ./gradlew :sprite:jvmRun -DmainClass=SpriteRunnerKt, it works fine.

[David Herman]

I'm not in a great place to upload the code, and it's very late here, so I can do this tomorrow if necessary. But since what I'm running into is so basic, I'm wondering if I'm just understanding the fundamental feature wrong?

[tapchicoma]

you are using the wrong task name - it should be runJvm - see this issue

[David Herman]

OMG 😄

Yahor, do you know if someone at JetBrains can add a line to the docs (https://kotl.in/jvm-binaries-dsl) that warns people against using the legacy "jvmRun" task, perhaps even linking to KT-75240 for more information?

[mbonnin]

@David Herman FWIW, most of the Kotlin docs (all?) are open source. You can send a PR here, they are usually triaged in a few days

[Vampire]

I wish that would be true for code changes, my PR waits since 7 months :-(

[David Herman]

@mbonnin Thanks for the heads up! https://github.com/JetBrains/kotlin-web-site/pull/5034