bump min Gradle version to 8.13 (#1095)

* bump min Gradle version to 8.13

* ktlint

* add min jdk

Author: gabrielittner

CHANGELOG.md

@@ -3,24 +3,26 @@
 ## [UNRELEASED](https://github.com/vanniktech/gradle-maven-publish-plugin/compare/0.34.0...HEAD) *(2025-xx-xx)*
 
 - Add support for publishing Kotlin Multiplatform libraries that use `com.android.kotlin.multiplatform.library`.
+- Raise minimum Gradle version to 8.13
+
 
 #### Minimum supported versions
 - JDK 11
-- Gradle 8.5
+- Gradle 8.13
 - Android Gradle Plugin 8.0.0
 - Kotlin Gradle Plugin 1.9.20
 
 #### Compatibility tested up to
 - JDK 24
 - Gradle 8.14.3
-- Gradle 9.0.0-rc2
+- Gradle 9.0.0-rc3
 - Android Gradle Plugin 8.11.1
-- Android Gradle Plugin 8.12.0-alpha08
+- Android Gradle Plugin 8.12.0-rc01
 - Kotlin Gradle Plugin 2.2.0
 - Kotlin Gradle Plugin 2.2.20-Beta1
 
 
-## [0.34.0.](https://github.com/vanniktech/gradle-maven-publish-plugin/releases/tag/0.34.0) *(2025-07-13)*
+## [0.34.0](https://github.com/vanniktech/gradle-maven-publish-plugin/releases/tag/0.34.0) *(2025-07-13)*
 
 - Added configuration cache support for publishing.
 - Removed support for publishing through Sonatype OSSRH since it has been shut down. See the

plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/JavaPluginTest.kt

@@ -60,14 +60,7 @@ class JavaPluginTest : BasePluginTest() {
     assertThat(result).artifact("jar").isSigned()
     assertThat(result).pom().exists()
     assertThat(result).pom().isSigned()
-    if (gradleVersion < GradleVersion.GRADLE_8_12) {
-      assertThat(result).pom().matchesExpectedPom(
-        // TODO: Gradle currently adds a self dependency when test fixtures are published https://github.com/gradle/gradle/issues/14936
-        PomDependency("com.example", "test-artifact", "1.0.0", "compile", true),
-      )
-    } else {
-      assertThat(result).pom().matchesExpectedPom()
-    }
+    assertThat(result).pom().matchesExpectedPom()
     assertThat(result).module().exists()
     assertThat(result).module().isSigned()
     assertThat(result).sourcesJar().exists()

plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/KotlinPluginTest.kt

@@ -51,15 +51,7 @@ class KotlinPluginTest : BasePluginTest() {
     assertThat(result).artifact("jar").isSigned()
     assertThat(result).pom().exists()
     assertThat(result).pom().isSigned()
-    if (gradleVersion < GradleVersion.GRADLE_8_12) {
-      assertThat(result).pom().matchesExpectedPom(
-        kotlinStdlibJdk(kotlinVersion),
-        // TODO: Gradle currently adds a self dependency when test fixtures are published https://github.com/gradle/gradle/issues/14936
-        PomDependency("com.example", "test-artifact", "1.0.0", "compile", true),
-      )
-    } else {
-      assertThat(result).pom().matchesExpectedPom(kotlinStdlibJdk(kotlinVersion))
-    }
+    assertThat(result).pom().matchesExpectedPom(kotlinStdlibJdk(kotlinVersion))
     assertThat(result).module().exists()
     assertThat(result).module().isSigned()
     assertThat(result).sourcesJar().exists()

plugin/src/integrationTest/kotlin/com/vanniktech/maven/publish/TestOptions.kt

@@ -67,8 +67,8 @@ enum class GradleVersion(
 ) {
   // minimum supported
   GRADLE_MIN(
-    value = "8.5",
-    firstUnsupportedJdkVersion = JavaVersion.VERSION_22,
+    value = "8.13",
+    firstUnsupportedJdkVersion = JavaVersion.VERSION_24,
   ),
 
   // latest versions of each type

plugin/src/main/kotlin/com/vanniktech/maven/publish/MavenPublishBaseExtension.kt

@@ -5,7 +5,6 @@ import com.vanniktech.maven.publish.central.EnableAutomaticMavenCentralPublishin
 import com.vanniktech.maven.publish.central.MavenCentralBuildService.Companion.registerMavenCentralBuildService
 import com.vanniktech.maven.publish.central.PrepareMavenCentralPublishingTask.Companion.registerPrepareMavenCentralPublishingTask
 import com.vanniktech.maven.publish.tasks.WorkaroundSignatureType
-import com.vanniktech.maven.publish.workaround.rootProjectBuildDir
 import javax.inject.Inject
 import org.gradle.api.Action
 import org.gradle.api.Incubating
@@ -21,7 +20,6 @@ import org.gradle.external.javadoc.StandardJavadocDocletOptions
 import org.gradle.plugins.signing.Sign
 import org.gradle.plugins.signing.SigningPlugin
 import org.gradle.plugins.signing.type.pgp.ArmoredSignatureType
-import org.gradle.util.GradleVersion
 import org.jetbrains.dokka.gradle.DokkaTask
 
 public abstract class MavenPublishBaseExtension @Inject constructor(
@@ -84,7 +82,7 @@ public abstract class MavenPublishBaseExtension @Inject constructor(
     val buildService = project.registerMavenCentralBuildService(
       repositoryUsername = project.providers.gradleProperty("mavenCentralUsername"),
       repositoryPassword = project.providers.gradleProperty("mavenCentralPassword"),
-      rootBuildDirectory = project.rootProjectBuildDir(),
+      rootBuildDirectory = @Suppress("UnstableApiUsage") project.layout.settingsDirectory.dir("build"),
       buildEventsListenerRegistry = buildEventsListenerRegistry,
     )
 
@@ -244,13 +242,7 @@ public abstract class MavenPublishBaseExtension @Inject constructor(
    */
   public fun pom(configure: Action<in MavenPom>) {
     project.mavenPublications { publication ->
-      if (GradleVersion.current() >= GradleVersion.version("8.8-rc-1")) {
-        publication.pom(configure)
-      } else {
-        project.afterEvaluate {
-          publication.pom(configure)
-        }
-      }
+      publication.pom(configure)
     }
   }
 

plugin/src/main/kotlin/com/vanniktech/maven/publish/MavenPublishBasePlugin.kt

@@ -41,7 +41,7 @@ public abstract class MavenPublishBasePlugin : Plugin<Project> {
   }
 
   private companion object {
-    val MIN_GRADLE_VERSION: GradleVersion = GradleVersion.version("8.5")
+    val MIN_GRADLE_VERSION: GradleVersion = GradleVersion.version("8.13")
     val KOTLIN_PLUGIN_IDS = listOf(
       "org.jetbrains.kotlin.jvm",
       "org.jetbrains.kotlin.multiplatform",

plugin/src/main/kotlin/com/vanniktech/maven/publish/central/MavenCentralBuildService.kt

@@ -165,7 +165,7 @@ internal abstract class MavenCentralBuildService :
     fun Project.registerMavenCentralBuildService(
       repositoryUsername: Provider<String>,
       repositoryPassword: Provider<String>,
-      rootBuildDirectory: Provider<Directory>,
+      rootBuildDirectory: Directory,
       buildEventsListenerRegistry: BuildEventsListenerRegistry,
     ): Provider<MavenCentralBuildService> {
       val okhttpTimeout = project.providers

plugin/src/main/kotlin/com/vanniktech/maven/publish/workaround/IsolatedProjects.kt

@@ -4,7 +4,6 @@ package com.vanniktech.maven.publish.workaround
 
 import com.vanniktech.maven.publish.baseExtension
 import org.gradle.api.Project
-import org.gradle.api.artifacts.Configuration
 import org.gradle.api.attributes.DocsType
 import org.gradle.api.internal.project.ProjectInternal
 import org.gradle.api.plugins.JavaPluginExtension
@@ -33,38 +32,15 @@ internal fun addTestFixturesSourcesJar(project: Project) {
     ProjectDerivedCapability::class.java.getConstructor(Project::class.java, String::class.java)
   }.newInstance(projectInternal, "testFixtures")
 
-  val sourceElements = if (GradleVersion.current() >= GradleVersion.version("8.6-rc-1")) {
-    JvmPluginsHelper.createDocumentationVariantWithArtifact(
-      testFixturesSourceSet.sourcesElementsConfigurationName,
-      testFixtureSourceSetName,
-      DocsType.SOURCES,
-      setOf(projectDerivedCapability),
-      testFixturesSourceSet.sourcesJarTaskName,
-      testFixturesSourceSet.allSource,
-      projectInternal,
-    )
-  } else {
-    JvmPluginsHelper::class.java
-      .getMethod(
-        "createDocumentationVariantWithArtifact",
-        String::class.java,
-        String::class.java,
-        String::class.java,
-        List::class.java,
-        String::class.java,
-        Object::class.java,
-        ProjectInternal::class.java,
-      ).invoke(
-        null,
-        testFixturesSourceSet.sourcesElementsConfigurationName,
-        testFixtureSourceSetName,
-        DocsType.SOURCES,
-        listOf(projectDerivedCapability),
-        testFixturesSourceSet.sourcesJarTaskName,
-        testFixturesSourceSet.allSource,
-        projectInternal,
-      ) as Configuration
-  }
+  val sourceElements = JvmPluginsHelper.createDocumentationVariantWithArtifact(
+    testFixturesSourceSet.sourcesElementsConfigurationName,
+    testFixtureSourceSetName,
+    DocsType.SOURCES,
+    setOf(projectDerivedCapability),
+    testFixturesSourceSet.sourcesJarTaskName,
+    testFixturesSourceSet.allSource,
+    projectInternal,
+  )
 
   val component = JavaPluginHelper.getJavaComponent(project) as DefaultJvmSoftwareComponent
   component.addVariantsFromConfiguration(sourceElements, JavaConfigurationVariantMapping("compile", true))