Remove Kotlin jvmTarget option

This is obsolete when using toolchains. The Kotlin plugin automatically
sets the jvmTarget to the used toolchain.

See gh-1227

initializr-generator-spring/src/main/java/io/spring/initializr/generator/spring/code/kotlin/KotlinGradleBuildCustomizer.java

@@ -51,7 +51,6 @@ public void customize(GradleBuild build) {
 
 	private void customizeCompilerOptions(GradleBuild build) {
 		build.extensions().customize("kotlin", (kotlin) -> kotlin.nested("compilerOptions", (compilerOptions) -> {
-			compilerOptions.attributeWithType("jvmTarget", getJvmTarget(), "org.jetbrains.kotlin.gradle.dsl.JvmTarget");
 			if (!CollectionUtils.isEmpty(this.settings.getCompilerArgs())) {
 				compilerOptions.invoke("freeCompilerArgs.addAll", quote(this.settings.getCompilerArgs()));
 			}
@@ -62,11 +61,4 @@ private List<String> quote(List<String> compilerArgs) {
 		return compilerArgs.stream().map((element) -> this.quote + element + this.quote).toList();
 	}
 
-	private String getJvmTarget() {
-		if ("1.8".equals(this.settings.getJvmTarget())) {
-			return "JvmTarget.JVM_1_8";
-		}
-		return "JvmTarget.JVM_" + this.settings.getJvmTarget();
-	}
-
 }

initializr-generator-spring/src/test/java/io/spring/initializr/generator/spring/code/kotlin/KotlinGradleBuildCustomizerTests.java

@@ -16,12 +16,9 @@
 
 package io.spring.initializr.generator.spring.code.kotlin;
 
-import io.spring.initializr.generator.buildsystem.gradle.Attribute;
 import io.spring.initializr.generator.buildsystem.gradle.GradleBuild;
 import org.assertj.core.groups.Tuple;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.CsvSource;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -47,13 +44,10 @@ void kotlinPluginsAreConfigured() {
 	void shouldCustomizeCompilerOptions() {
 		GradleBuild build = new GradleBuild();
 		new KotlinGradleBuildCustomizer(new SimpleKotlinProjectSettings("1.2.70"), '\'').customize(build);
-		assertThat(build.extensions().importedTypes()).contains("org.jetbrains.kotlin.gradle.dsl.JvmTarget");
 		assertThat(build.extensions().values()).singleElement().satisfies((kotlin) -> {
 			assertThat(kotlin.getName()).isEqualTo("kotlin");
 			assertThat(kotlin.getNested().values()).singleElement().satisfies((compilerOptions) -> {
 				assertThat(compilerOptions.getName()).isEqualTo("compilerOptions");
-				assertThat(compilerOptions.getAttributes()).singleElement()
-					.isEqualTo(Attribute.set("jvmTarget", "JvmTarget.JVM_1_8"));
 				assertThat(compilerOptions.getInvocations()).singleElement().satisfies((freeCompilerArgs) -> {
 					assertThat(freeCompilerArgs.getTarget()).isEqualTo("freeCompilerArgs.addAll");
 					assertThat(freeCompilerArgs.getArguments()).containsExactly("'-Xjsr305=strict'");
@@ -62,19 +56,4 @@ void shouldCustomizeCompilerOptions() {
 		});
 	}
 
-	@ParameterizedTest
-	@CsvSource(textBlock = """
-			1.8, JvmTarget.JVM_1_8
-			17, JvmTarget.JVM_17
-			21, JvmTarget.JVM_21
-			""")
-	void shouldSetJvmTarget(String jvmTarget, String constant) {
-		GradleBuild build = new GradleBuild();
-		new KotlinGradleBuildCustomizer(new SimpleKotlinProjectSettings("1.2.70", jvmTarget), '\'').customize(build);
-		assertThat(build.extensions().values()).singleElement()
-			.satisfies((kotlin) -> assertThat(kotlin.getNested().values()).singleElement()
-				.satisfies((compilerOptions) -> assertThat(compilerOptions.getAttributes()).singleElement()
-					.isEqualTo(Attribute.set("jvmTarget", constant))));
-	}
-
 }

initializr-generator-spring/src/test/resources/project/gradle/kotlin-java11-build.gradle.gen

@@ -1,5 +1,3 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget
-
 plugins {
 	id 'org.springframework.boot' version '2.4.1'
 	id 'io.spring.dependency-management' version '1.0.6.RELEASE'
@@ -30,7 +28,6 @@ dependencies {
 kotlin {
 	compilerOptions {
 		freeCompilerArgs.addAll '-Xjsr305=strict'
-		jvmTarget = JvmTarget.JVM_11
 	}
 }
 

initializr-generator-spring/src/test/resources/project/gradle/kotlin-java11-build.gradle.kts.gen

@@ -1,5 +1,3 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget
-
 plugins {
 	id("org.springframework.boot") version "2.4.1"
 	id("io.spring.dependency-management") version "1.0.6.RELEASE"
@@ -30,7 +28,6 @@ dependencies {
 kotlin {
 	compilerOptions {
 		freeCompilerArgs.addAll("-Xjsr305=strict")
-		jvmTarget = JvmTarget.JVM_11
 	}
 }
 

initializr-generator-spring/src/test/resources/project/kotlin/standard/build.gradle.gen

@@ -1,5 +1,3 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget
-
 plugins {
 	id 'org.springframework.boot' version '2.4.1'
 	id 'io.spring.dependency-management' version '1.0.6.RELEASE'
@@ -30,7 +28,6 @@ dependencies {
 kotlin {
 	compilerOptions {
 		freeCompilerArgs.addAll '-Xjsr305=strict'
-		jvmTarget = JvmTarget.JVM_1_8
 	}
 }
 

initializr-generator-spring/src/test/resources/project/kotlin/standard/build.gradle.kts.gen

@@ -1,5 +1,3 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget
-
 plugins {
 	id("org.springframework.boot") version "2.4.1"
 	id("io.spring.dependency-management") version "1.0.6.RELEASE"
@@ -30,7 +28,6 @@ dependencies {
 kotlin {
 	compilerOptions {
 		freeCompilerArgs.addAll("-Xjsr305=strict")
-		jvmTarget = JvmTarget.JVM_1_8
 	}
 }
 

initializr-generator-spring/src/test/resources/project/kotlin/standard/war-build.gradle.gen

@@ -1,5 +1,3 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget
-
 plugins {
 	id 'war'
 	id 'org.springframework.boot' version '2.4.1'
@@ -32,7 +30,6 @@ dependencies {
 kotlin {
 	compilerOptions {
 		freeCompilerArgs.addAll '-Xjsr305=strict'
-		jvmTarget = JvmTarget.JVM_1_8
 	}
 }
 

initializr-generator-spring/src/test/resources/project/kotlin/standard/war-build.gradle.kts.gen

@@ -1,5 +1,3 @@
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget
-
 plugins {
 	war
 	id("org.springframework.boot") version "2.4.1"
@@ -32,7 +30,6 @@ dependencies {
 kotlin {
 	compilerOptions {
 		freeCompilerArgs.addAll("-Xjsr305=strict")
-		jvmTarget = JvmTarget.JVM_1_8
 	}
 }