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TapchicomaSpace Team
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[Gradle] Fail the build if AGP has already configured Kotlin in the project
Since AGP 9.0 has support for built-in Kotlin and 'org.jetbrains.kotlin .android' plugin application in the project is not required. With this change we produce nice user error if 'org.jetbrains.kotlin .android' still was applied in the project after AGP. ^KT-80172 Verification Pending
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‎libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/internal/diagnostics/AgpWithBuiltInKotlinAppliedCheck.kt‎

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/*
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* Copyright 2010-2025 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package org.jetbrains.kotlin.gradle.internal.diagnostics
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import org.gradle.api.Project
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import org.jetbrains.kotlin.gradle.dsl.kotlinAndroidExtensionOrNull
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import org.jetbrains.kotlin.gradle.plugin.AndroidGradlePluginVersion
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import org.jetbrains.kotlin.gradle.plugin.diagnostics.KotlinToolingDiagnostics
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import org.jetbrains.kotlin.gradle.plugin.diagnostics.reportDiagnostic
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internal object AgpWithBuiltInKotlinAppliedCheck {
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val minimalBuiltInKotlinSupportedAgpVersion = AndroidGradlePluginVersion(9, 0, 0, "alpha01")
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fun Project.runAgpWithBuiltInKotlinIfAppliedCheck(
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agpVersionProvider: AndroidGradlePluginVersionProvider = AndroidGradlePluginVersionProvider.Default
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) {
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val isKotlinAndroidExtensionExists = kotlinAndroidExtensionOrNull != null
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val agpVersion = agpVersionProvider.get()
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if (isKotlinAndroidExtensionExists &&
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agpVersion != null &&
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agpVersion >= minimalBuiltInKotlinSupportedAgpVersion
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) {
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project.reportDiagnostic(
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KotlinToolingDiagnostics.AgpWithBuiltInKotlinIsAlreadyApplied(
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project.buildFile.relativeTo(project.rootDir),
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Throwable()
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)
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)
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}
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}
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interface AndroidGradlePluginVersionProvider {
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fun get(): AndroidGradlePluginVersion?
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object Default : AndroidGradlePluginVersionProvider {
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override fun get(): AndroidGradlePluginVersion? {
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return AndroidGradlePluginVersion.currentOrNull
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}
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}
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}
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}

‎libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPluginWrapper.kt‎

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@@ -31,6 +31,7 @@ import org.jetbrains.kotlin.gradle.internal.KOTLIN_COMPILER_EMBEDDABLE
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import org.jetbrains.kotlin.gradle.internal.KOTLIN_MODULE_GROUP
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import org.jetbrains.kotlin.gradle.internal.attributes.setupAttributesMatchingStrategy
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import org.jetbrains.kotlin.gradle.internal.diagnostics.AgpCompatibilityCheck.runAgpCompatibilityCheckIfAgpIsApplied
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import org.jetbrains.kotlin.gradle.internal.diagnostics.AgpWithBuiltInKotlinAppliedCheck.runAgpWithBuiltInKotlinIfAppliedCheck
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import org.jetbrains.kotlin.gradle.internal.diagnostics.GradleCompatibilityCheck.runGradleCompatibilityCheck
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import org.jetbrains.kotlin.gradle.internal.diagnostics.KotlinCompilerEmbeddableCheck.checkCompilerEmbeddableInClasspath
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import org.jetbrains.kotlin.gradle.internal.properties.PropertiesBuildService
@@ -225,6 +226,7 @@ abstract class KotlinBasePluginWrapper : DefaultKotlinBasePlugin() {
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project.addPgpSignatureHelpers()
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project.addPomValidationHelpers()
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project.addSigningValidationHelpers()
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if (projectExtensionClass == KotlinAndroidProjectExtension::class) project.runAgpWithBuiltInKotlinIfAppliedCheck()
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project.createKotlinExtension(projectExtensionClass).apply {
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coreLibrariesVersion = pluginVersion

‎libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt‎

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@@ -1810,6 +1810,18 @@ internal object KotlinToolingDiagnostics {
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.documentationLink(URI("https://kotl.in/9l92c3"))
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}
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}
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internal object AgpWithBuiltInKotlinIsAlreadyApplied : ToolingDiagnosticFactory(FATAL, DiagnosticGroup.Kgp.Misconfiguration) {
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operator fun invoke(
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buildFile: File,
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trace: Throwable,
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) = build(throwable = trace) {
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title("Failed to apply plugin 'com.jetbrains.kotlin.android'")
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.description("The 'org.jetbrains.kotlin.android' plugin is no longer required for Kotlin support since AGP 9.0.")
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.solution("Remove the 'org.jetbrains.kotlin.android' plugin from this project's build file: ${buildFile}.")
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.documentationLink(URI("https://issuetracker.google.com/438678642"))
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}
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}
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}
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private fun String.indentLines(nSpaces: Int = 4, skipFirstLine: Boolean = true): String {

‎libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/unitTests/checkers/AgpWithBuiltInKotlinAppliedCheckTest.kt‎

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/*
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* Copyright 2010-2025 JetBrains s.r.o. and Kotlin Programming Language contributors.
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* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
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*/
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package org.jetbrains.kotlin.gradle.unitTests.checkers
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import org.gradle.api.InvalidUserCodeException
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import org.jetbrains.kotlin.gradle.dsl.KotlinAndroidProjectExtension
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import org.jetbrains.kotlin.gradle.dsl.createKotlinExtension
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import org.jetbrains.kotlin.gradle.internal.diagnostics.AgpWithBuiltInKotlinAppliedCheck
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import org.jetbrains.kotlin.gradle.internal.diagnostics.AgpWithBuiltInKotlinAppliedCheck.minimalBuiltInKotlinSupportedAgpVersion
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import org.jetbrains.kotlin.gradle.internal.diagnostics.AgpWithBuiltInKotlinAppliedCheck.runAgpWithBuiltInKotlinIfAppliedCheck
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import org.jetbrains.kotlin.gradle.plugin.AndroidGradlePluginVersion
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import org.jetbrains.kotlin.gradle.util.assertNoDiagnostics
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import org.jetbrains.kotlin.gradle.util.buildProject
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import org.jetbrains.kotlin.gradle.util.checkDiagnostics
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import org.jetbrains.kotlin.gradle.util.registerMinimalVariantImplementationFactoriesForTests
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import org.junit.Test
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import kotlin.test.assertFails
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import kotlin.test.assertTrue
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class AgpWithBuiltInKotlinAppliedCheckTest {
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private val projectWithKotlinAndroidExtensionApplied = buildProject {
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gradle.registerMinimalVariantImplementationFactoriesForTests()
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project.createKotlinExtension(KotlinAndroidProjectExtension::class)
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}
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private val unaffectedAgpVersion = FixedAndroidGradlePluginVersionProvider("8.12.0")
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private val unknownAgpVersion = FixedAndroidGradlePluginVersionProvider(null)
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private val affectedAgpVersion = FixedAndroidGradlePluginVersionProvider(minimalBuiltInKotlinSupportedAgpVersion.toString())
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@Test
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fun testNotAffectedVersion() {
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projectWithKotlinAndroidExtensionApplied.runAgpWithBuiltInKotlinIfAppliedCheck(unaffectedAgpVersion)
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projectWithKotlinAndroidExtensionApplied.assertNoDiagnostics()
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}
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@Test
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fun testAffectedVersion() {
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val error = assertFails {
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projectWithKotlinAndroidExtensionApplied.runAgpWithBuiltInKotlinIfAppliedCheck(affectedAgpVersion)
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}
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assertTrue(error is InvalidUserCodeException)
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projectWithKotlinAndroidExtensionApplied.checkDiagnostics("checkers/agpBuiltInKotlinCheck/affectedVersion")
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}
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@Test
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fun testNoAgpApplied() {
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projectWithKotlinAndroidExtensionApplied.runAgpWithBuiltInKotlinIfAppliedCheck(unknownAgpVersion)
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projectWithKotlinAndroidExtensionApplied.assertNoDiagnostics()
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}
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internal class FixedAndroidGradlePluginVersionProvider(
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private val version: String?
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) : AgpWithBuiltInKotlinAppliedCheck.AndroidGradlePluginVersionProvider {
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override fun get(): AndroidGradlePluginVersion? {
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if (version == null) return null
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return AndroidGradlePluginVersion(version)
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}
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}
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}

‎libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/checkers/agpBuiltInKotlinCheck/affectedVersion.txt‎

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[AgpWithBuiltInKotlinIsAlreadyApplied | FATAL] Failed to apply plugin 'com.jetbrains.kotlin.android'
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The 'org.jetbrains.kotlin.android' plugin is no longer required for Kotlin support since AGP 9.0.
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Remove the 'org.jetbrains.kotlin.android' plugin from this project's build file: build.gradle.
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See https://issuetracker.google.com/438678642 for more details.

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