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Upgrade to Kotlin 2.1.0
This commit upgrades to Kotlin 2.1.0. Two related dependencies have been updated as well: Kotlin Coroutines to 1.10, and Kotlin Serialization to 1.8. As of Kotlin 2, it is no longer possible to have a Java type and a Kotlin type with the same name. As our code samples follow that unfortunate pattern, this commit makes sure that the Kotlin sample code does not depend on any of the Java counterpart and configure the kotlin compilation plugin to ignore Java sources. The minimum version of Gradle is 7.6.4. It bundles a version of Kotlin that cannot compile a Kotlin build script when spring-core, compiled with Kotlin 2.1, is on the classpath. Using Gradle 8.12 to run the DSL tests avoids the problem. Closes gh-45486 Co-authored-by: Andy Wilkinson <andy.wilkinson@broadcom.com>
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‎.gitignore

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@@ -41,3 +41,4 @@ secrets.yml
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.sts4-cache
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.git-hooks/
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node_modules
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/.kotlin/

‎buildSrc/build.gradle

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@@ -42,7 +42,6 @@ dependencies {
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implementation("org.apache.maven:maven-artifact:${mavenVersion}")
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implementation("org.antora:gradle-antora-plugin:1.0.0")
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implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
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implementation("org.jetbrains.kotlin:kotlin-compiler-embeddable:${kotlinVersion}")
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implementation("org.springframework:spring-context")
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implementation("org.springframework:spring-core")
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implementation("org.springframework:spring-web")

‎buildSrc/src/main/java/org/springframework/boot/build/KotlinConventions.java

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/*
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* Copyright 2012-2024 the original author or authors.
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* Copyright 2012-2025 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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package org.springframework.boot.build;
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import java.net.URI;
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import java.util.ArrayList;
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import java.util.List;
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import dev.adamko.dokkatoo.DokkatooExtension;
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import dev.adamko.dokkatoo.formats.DokkatooHtmlPlugin;
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import org.gradle.api.Project;
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import org.gradle.api.tasks.SourceSet;
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import org.gradle.api.tasks.SourceSetContainer;
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import org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions;
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import org.jetbrains.kotlin.gradle.dsl.JvmTarget;
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import org.jetbrains.kotlin.gradle.dsl.KotlinJvmCompilerOptions;
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import org.jetbrains.kotlin.gradle.dsl.KotlinVersion;
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import org.jetbrains.kotlin.gradle.tasks.KotlinCompile;
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/**
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}
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private void configure(KotlinCompile compile) {
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KotlinJvmOptions kotlinOptions = compile.getKotlinOptions();
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kotlinOptions.setApiVersion("1.7");
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kotlinOptions.setLanguageVersion("1.7");
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kotlinOptions.setJvmTarget("17");
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kotlinOptions.setAllWarningsAsErrors(true);
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List<String> freeCompilerArgs = new ArrayList<>(kotlinOptions.getFreeCompilerArgs());
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freeCompilerArgs.add("-Xsuppress-version-warnings");
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kotlinOptions.setFreeCompilerArgs(freeCompilerArgs);
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KotlinJvmCompilerOptions compilerOptions = compile.getCompilerOptions();
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compilerOptions.getApiVersion().set(KotlinVersion.KOTLIN_2_1);
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compilerOptions.getLanguageVersion().set(KotlinVersion.KOTLIN_2_1);
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compilerOptions.getJvmTarget().set(JvmTarget.JVM_17);
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compilerOptions.getAllWarningsAsErrors().set(true);
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compilerOptions.getFreeCompilerArgs().addAll("-Xsuppress-version-warnings");
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}
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private void configureDokkatoo(Project project) {

‎gradle.properties

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jacksonVersion=2.18.4
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javaFormatVersion=0.0.43
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junitJupiterVersion=5.12.2
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kotlinVersion=1.9.25
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kotlinVersion=2.1.0
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mavenVersion=3.9.4
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mockitoVersion=5.17.0
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nativeBuildToolsVersion=0.10.6

‎spring-boot-project/spring-boot-dependencies/build.gradle

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}
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}
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library("Kotlin", "${kotlinVersion}") {
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prohibit {
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versionRange "[2.0.0-Beta1,)"
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because "it exceeds our baseline"
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}
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group("org.jetbrains.kotlin") {
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bom("kotlin-bom")
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plugins = [
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releaseNotes("https://github.com/JetBrains/kotlin/releases/tag/v{version}")
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}
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}
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library("Kotlin Coroutines", "1.8.1") {
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prohibit {
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versionRange "[1.9.0-RC,)"
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because "it requires Kotlin 2"
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}
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library("Kotlin Coroutines", "1.10.1") {
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group("org.jetbrains.kotlinx") {
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bom("kotlinx-coroutines-bom")
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}
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releaseNotes("https://github.com/Kotlin/kotlinx.coroutines/releases/tag/{version}")
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}
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}
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library("Kotlin Serialization", "1.6.3") {
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prohibit {
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versionRange "[1.7.0-RC,)"
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because "it requires Kotlin 2"
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}
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library("Kotlin Serialization", "1.8.0") {
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group("org.jetbrains.kotlinx") {
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bom("kotlinx-serialization-bom")
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}

‎spring-boot-project/spring-boot-docs/build.gradle

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import org.jetbrains.kotlin.gradle.tasks.KotlinCompilationTask
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import org.springframework.boot.build.docs.ConfigureJavadocLinks
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plugins {
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enabled = false
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}
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// To avoid a redeclaration error with Kotlin compiler
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tasks.named('compileKotlin', KotlinCompilationTask.class) {
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javaSources.from = []
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}
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plugins.withType(EclipsePlugin) {
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eclipse.classpath { classpath ->
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classpath.plusConfigurations.add(configurations.getByName(sourceSets.main.runtimeClasspathConfigurationName))

‎spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/pages/features/kotlin.adoc

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@@ -15,7 +15,7 @@ Feel free to join the #spring channel of https://slack.kotlinlang.org/[Kotlin Sl
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[[features.kotlin.requirements]]
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== Requirements
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Spring Boot requires at least Kotlin 1.7.x and manages a suitable Kotlin version through dependency management.
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Spring Boot requires at least Kotlin 2.1.x and manages a suitable Kotlin version through dependency management.
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To use Kotlin, `org.jetbrains.kotlin:kotlin-stdlib` and `org.jetbrains.kotlin:kotlin-reflect` must be present on the classpath.
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The `kotlin-stdlib` variants `kotlin-stdlib-jdk7` and `kotlin-stdlib-jdk8` can also be used.
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‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/data/nosql/cassandra/connecting/User.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.data.nosql.cassandra.connecting
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class User

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/features/externalconfig/typesafeconfigurationproperties/usingannotatedtypes/Server.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.features.externalconfig.typesafeconfigurationproperties.usingannotatedtypes
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class Server(remoteAddress: Any?) {
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fun start() {
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}
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}

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/features/springapplication/applicationavailability/managing/CacheCompletelyBrokenException.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.features.springapplication.applicationavailability.managing
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class CacheCompletelyBrokenException: RuntimeException()

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/features/testcontainers/atdevelopmenttime/importingcontainerdeclarations/MyContainers.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.features.testcontainers.atdevelopmenttime.importingcontainerdeclarations
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class MyContainers {
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}

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/features/testcontainers/atdevelopmenttime/importingcontainerdeclarations/MyContainersConfiguration.kt

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/*
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* Copyright 2012-2023 the original author or authors.
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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package org.springframework.boot.docs.features.testcontainers.atdevelopmenttime.importingcontainerdeclarations
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import org.springframework.boot.docs.features.devservices.testcontainers.atdevelopmenttime.importingcontainerdeclarations.MyContainers
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import org.springframework.boot.test.context.TestConfiguration
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import org.springframework.boot.testcontainers.context.ImportTestcontainers
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‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/packaging/nativeimage/advanced/nestedconfigurationproperties/Nested.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.packaging.nativeimage.advanced.nestedconfigurationproperties
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class Nested {
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}

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/using/springbeansanddependencyinjection/multipleconstructors/AccountService.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
14+
* limitations under the License.
15+
*/
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package org.springframework.boot.docs.using.springbeansanddependencyinjection.multipleconstructors
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interface AccountService {
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}

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/using/springbeansanddependencyinjection/multipleconstructors/RiskAssessor.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
6+
* You may obtain a copy of the License at
7+
*
8+
* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.using.springbeansanddependencyinjection.multipleconstructors
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interface RiskAssessor {
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}

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/using/springbeansanddependencyinjection/singleconstructor/AccountService.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
8+
* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
14+
* limitations under the License.
15+
*/
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package org.springframework.boot.docs.using.springbeansanddependencyinjection.singleconstructor
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interface AccountService {
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}

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/using/springbeansanddependencyinjection/singleconstructor/RiskAssessor.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.using.springbeansanddependencyinjection.singleconstructor
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interface RiskAssessor {
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}

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/using/usingthespringbootapplicationannotation/individualannotations/AnotherConfiguration.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.using.usingthespringbootapplicationannotation.individualannotations
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class AnotherConfiguration

‎spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/using/usingthespringbootapplicationannotation/individualannotations/SomeConfiguration.kt

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/*
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* Copyright 2012-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.docs.using.usingthespringbootapplicationannotation.individualannotations
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class SomeConfiguration

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