Unresolved reference: compileKotlin in build.gradle.kts

Question

Kotlin project success build by build.gradle:

compileKotlin {
    kotlinOptions.jvmTarget = JavaVersion.VERSION_1_8
}
compileTestKotlin {
    kotlinOptions.jvmTarget = JavaVersion.VERSION_1_8
}

Nice.

But I need to change to build.gradle.kts:

 plugins {
    kotlin("jvm") version "1.2.10"
    id("application")
}

group = "com.myproject"
version = "1.0-SNAPSHOT"

application {
    mainClassName = "MainKt"
}

java.sourceCompatibility = JavaVersion.VERSION_1_8

repositories {
    mavenCentral()
    jcenter()
}

val kotlinVer = "1.2.10"

dependencies {
    compile(kotlin(module = "stdlib-jre8", version = kotlinVer))
    implementation("com.google.code.gson:gson:2.7")
    implementation("com.squareup.okhttp3:logging-interceptor:3.8.0")
    implementation("com.squareup.retrofit2:converter-gson:2.1.0")
    implementation("com.squareup.retrofit2:retrofit:2.5.0")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

}

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

and now I get error:

Line 32: compileKotlin {
           ^ Unresolved reference: compileKotlin

I don't see the `kotlin` plugin in your build script. https://kotlinlang.org/docs/reference/using-gradle.html — Laksitha Ranasingha, Apr 01 '19 at 13:32

score 45 · Answer 1 · edited Jun 15 '21 at 17:18

45

There's an issue in the Kotlin Gradle DSL that causes this.

https://github.com/gradle/kotlin-dsl-samples/issues/1368

You will need to use the following workaround until it gets resolved.

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

edited Jun 15 '21 at 17:18

IgorGanapolsky

26,189
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answered Nov 02 '19 at 03:24

Some Noob Student

14,186
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Any ideas on how to extend this task? I want to create a custom task that compiles kotlin files. – AouledIssa Jun 02 '20 at 09:37
4

Should import `KotlinCompile` first: `import org.jetbrains.kotlin.gradle.tasks.KotlinCompile`. – rosuh Sep 03 '20 at 03:55

score 15 · Answer 2 · answered May 02 '19 at 17:52

Following official Kotlin documentation (using Gradle part), I suggest to use such constructions in the build.gradle.kts:

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    java
    kotlin("jvm") version ("1.3.21")
}
// repositories, dependencies, etc...
val compileKotlin: KotlinCompile by tasks
val compileTestKotlin: KotlinCompile by tasks

compileKotlin.kotlinOptions {
    jvmTarget = "1.8"
}
compileTestKotlin.kotlinOptions {
    jvmTarget = "1.8"
}

Shouldn't be there a difference between `compileTestKotlin` and `compileKotlin`. Or maybe I'm missing sth? — Siamak, Aug 18 '21 at 10:15

score 9 · Answer 3 · answered Jan 29 '20 at 10:44

Use withType keyword:

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    val kotlin = "1.3.61"
    kotlin("jvm") version kotlin apply false
}

subprojects {
    repositories { mavenCentral(); mavenLocal() }
    apply(plugin = "org.jetbrains.kotlin.jvm")

    tasks {
        val java: String by project
        withType<KotlinCompile>{ 
            kotlinOptions { jvmTarget = java }; sourceCompatibility = java; targetCompatibility = java 
        }
    }
}

score 0 · Answer 4 · answered Mar 23 '23 at 23:54

unrelated: `Unresolved reference: compile`

I was able to provide the dependency to implementation() instead of compile()

// build.grdle.kts
//...
dependencies {
//- compile("com.cloudbees:groovy-cps:1.22)
//+ implementation("com.cloudbees:groovy-cps:1.22)
    implementation("com.cloudbees:groovy-cps:1.22)
}
//...

this so post says api and implementation keywords are successors to the compile keyword Gradle Implementation vs API configuration

edit:google turned up this question for Unresolved reference: compile

Unresolved reference: compileKotlin in build.gradle.kts

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Unresolved reference: compileKotlin in build.gradle.kts

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