Avoid configuration resolution error for v2 migration helper task

dokka-runners/dokka-gradle-plugin/src/classicMain/kotlin/DokkaClassicPlugin.kt

@@ -113,10 +113,13 @@ open class DokkaClassicPlugin : Plugin<Project> {
     }
 
     private fun Project.configureEachAbstractDokkaTask() {
-        tasks.withType<AbstractDokkaTask>().configureEach {
+        tasks.withType<AbstractDokkaTask>().configureEach task@{
             val formatClassifier = name.removePrefix("dokka").decapitalize()
             outputDirectory.convention(project.layout.buildDirectory.dir("dokka/$formatClassifier"))
             cacheRoot.convention(project.layout.dir(providers.provider { DokkaDefaults.cacheRoot }))
+
+            pluginsClasspath.from(this@task.plugins)
+            runtimeClasspath.from(this@task.runtime)
         }
     }
 

dokka-runners/dokka-gradle-plugin/src/classicMain/kotlin/dokkaBootstrapFactory.kt

@@ -6,17 +6,25 @@ package org.jetbrains.dokka.gradle
 
 import org.gradle.api.artifacts.Configuration
 import org.jetbrains.dokka.DokkaBootstrap
+import java.io.File
 import java.net.URLClassLoader
 import kotlin.reflect.KClass
 
-fun DokkaBootstrap(configuration: Configuration, bootstrapClass: KClass<out DokkaBootstrap>): DokkaBootstrap {
-    val runtimeJars = configuration.resolve()
+internal fun DokkaBootstrap(classpath: Set<File>, bootstrapClass: KClass<out DokkaBootstrap>): DokkaBootstrap {
     val runtimeClassLoader = URLClassLoader(
-        runtimeJars.map { it.toURI().toURL() }.toTypedArray(),
+        classpath.map { it.toURI().toURL() }.toTypedArray(),
         ClassLoader.getSystemClassLoader().parent
     )
 
     val runtimeClassloaderBootstrapClass = runtimeClassLoader.loadClass(bootstrapClass.qualifiedName)
     val runtimeClassloaderBootstrapInstance = runtimeClassloaderBootstrapClass.constructors.first().newInstance()
     return automagicTypedProxy(DokkaClassicPlugin::class.java.classLoader, runtimeClassloaderBootstrapInstance)
 }
+
+@Deprecated("Internal Dokka API.")
+fun DokkaBootstrap(configuration: Configuration, bootstrapClass: KClass<out DokkaBootstrap>): DokkaBootstrap {
+    return DokkaBootstrap(
+        classpath = configuration.resolve(),
+        bootstrapClass = bootstrapClass,
+    )
+}

dokka-runners/dokka-gradle-plugin/src/classicMain/kotlin/tasks/AbstractDokkaTask.kt

@@ -11,6 +11,7 @@ import org.gradle.api.Action
 import org.gradle.api.DefaultTask
 import org.gradle.api.Task
 import org.gradle.api.artifacts.Configuration
+import org.gradle.api.file.ConfigurableFileCollection
 import org.gradle.api.file.DirectoryProperty
 import org.gradle.api.logging.LogLevel
 import org.gradle.api.logging.LogLevel.*
@@ -23,6 +24,7 @@ import org.gradle.kotlin.dsl.property
 import org.gradle.util.GradleVersion
 import org.gradle.work.DisableCachingByDefault
 import org.jetbrains.dokka.*
+import org.jetbrains.dokka.gradle.internal.InternalDokkaGradlePluginApi
 import org.jetbrains.dokka.plugability.ConfigurableBlock
 import org.jetbrains.dokka.plugability.DokkaPlugin
 import java.util.concurrent.atomic.AtomicReference
@@ -195,12 +197,22 @@ abstract class AbstractDokkaTask : DefaultTask() {
         pluginsConfiguration.add(pluginConfiguration)
     }
 
-    @Classpath
+    @Internal
     val plugins: Configuration = project.maybeCreateDokkaPluginConfiguration(name)
 
-    @Classpath
+    /** Resolve the dependencies from [plugins]. */
+    @get:Classpath
+    @InternalDokkaGradlePluginApi
+    abstract val pluginsClasspath: ConfigurableFileCollection
+
+    @Internal
     val runtime: Configuration = project.maybeCreateDokkaRuntimeConfiguration(name)
 
+    /** Resolve the dependencies from [runtime]. */
+    @get:Classpath
+    @InternalDokkaGradlePluginApi
+    abstract val runtimeClasspath: ConfigurableFileCollection
+
     private val providers: ProviderFactory = project.providers
 
     /**
@@ -222,7 +234,7 @@ abstract class AbstractDokkaTask : DefaultTask() {
 
     @TaskAction
     internal open fun generateDocumentation() {
-        DokkaBootstrap(runtime, DokkaBootstrapImpl::class).apply {
+        DokkaBootstrap(runtimeClasspath.files, DokkaBootstrapImpl::class).apply {
             configure(buildDokkaConfiguration().toCompactJsonString(), createProxyLogger())
             val uncaughtExceptionHolder = AtomicReference<Throwable?>()
             /**

dokka-runners/dokka-gradle-plugin/src/testFunctional/kotlin/DokkaV1TaskDisabledTest.kt

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2014-2024 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+ */
+package org.jetbrains.dokka.gradle
+
+import io.kotest.core.spec.style.FunSpec
+import org.gradle.testkit.runner.TaskOutcome.SKIPPED
+import org.jetbrains.dokka.gradle.utils.addArguments
+import org.jetbrains.dokka.gradle.utils.build
+import org.jetbrains.dokka.gradle.utils.projects.initNoConfigMultiModuleProject
+import org.jetbrains.dokka.gradle.utils.shouldHaveRunTask
+
+class DokkaV1TaskDisabledTest : FunSpec({
+    context("given multi-module project") {
+
+        val project = initNoConfigMultiModuleProject {
+            gradleProperties {
+                dokka {
+                    pluginMode = "V2EnabledWithHelpers"
+                }
+            }
+        }
+
+        test("v1 tasks should be skipped when v2 is enabled") {
+            project.runner
+                .addArguments("dokkaHtml")
+                .build {
+                    shouldHaveRunTask(":subproject-one:dokkaHtml", SKIPPED)
+                    shouldHaveRunTask(":subproject-two:dokkaHtml", SKIPPED)
+                }
+        }
+    }
+})