diff --git a/.github/workflows/graalvm-latest.yml b/.github/workflows/graalvm-latest.yml
index 8b7f9fbbaa3..f79dede7f51 100644
--- a/.github/workflows/graalvm-latest.yml
+++ b/.github/workflows/graalvm-latest.yml
@@ -29,3 +29,4 @@ jobs:
           GRADLE_ENTERPRISE_ACCESS_KEY: ${{ secrets.GRADLE_ENTERPRISE_ACCESS_KEY }}
           GRADLE_ENTERPRISE_CACHE_USERNAME: ${{ secrets.GRADLE_ENTERPRISE_CACHE_USERNAME }}
           GRADLE_ENTERPRISE_CACHE_PASSWORD: ${{ secrets.GRADLE_ENTERPRISE_CACHE_PASSWORD }}
+
diff --git a/buildSrc/src/main/groovy/io.micronaut.internal.build.starter-openapi-module.gradle b/buildSrc/src/main/groovy/io.micronaut.internal.build.starter-openapi-module.gradle
index 6aeb2983e62..89991f17781 100644
--- a/buildSrc/src/main/groovy/io.micronaut.internal.build.starter-openapi-module.gradle
+++ b/buildSrc/src/main/groovy/io.micronaut.internal.build.starter-openapi-module.gradle
@@ -38,4 +38,4 @@ abstract class OpenApiSystemPropertyOverride implements CommandLineArgumentProvi
     Iterable<String> asArguments() {
         ["-Dmicronaut.openapi.config.file=${openApiPropertiesFile.asFile.get().absolutePath}".toString()]
     }
-}
+}
\ No newline at end of file
diff --git a/buildSrc/src/main/groovy/io.micronaut.internal.starter.base-module.gradle b/buildSrc/src/main/groovy/io.micronaut.internal.starter.base-module.gradle
index 0f2a2f9271e..6cffc3ffdf9 100644
--- a/buildSrc/src/main/groovy/io.micronaut.internal.starter.base-module.gradle
+++ b/buildSrc/src/main/groovy/io.micronaut.internal.starter.base-module.gradle
@@ -47,12 +47,3 @@ dependencies {
         exclude group: "org.apache.groovy", module: "groovy-all"
     }
 }
-java {
-    sourceCompatibility = JavaVersion.toVersion("21")
-    targetCompatibility = JavaVersion.toVersion("21")
-}
-java {
-    toolchain {
-        languageVersion = JavaLanguageVersion.of(21)
-    }
-}
\ No newline at end of file
diff --git a/buildSrc/src/main/groovy/io.micronaut.internal.starter.published-module.gradle b/buildSrc/src/main/groovy/io.micronaut.internal.starter.published-module.gradle
index dbd9c73c648..cfcad4f0bf8 100644
--- a/buildSrc/src/main/groovy/io.micronaut.internal.starter.published-module.gradle
+++ b/buildSrc/src/main/groovy/io.micronaut.internal.starter.published-module.gradle
@@ -2,3 +2,12 @@ plugins {
     id "io.micronaut.internal.starter.base-module"
     id "io.micronaut.build.internal.publishing"
 }
+java {
+    sourceCompatibility = JavaVersion.toVersion("17")
+    targetCompatibility = JavaVersion.toVersion("17")
+}
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
\ No newline at end of file
diff --git a/starter-cli/build.gradle b/starter-cli/build.gradle
index d2e83923108..2513f76b963 100644
--- a/starter-cli/build.gradle
+++ b/starter-cli/build.gradle
@@ -66,7 +66,7 @@ application {
 }
 
 rocker {
-    javaVersion = '21'
+    javaVersion = '17'
     postProcessing = ['io.micronaut.starter.rocker.WhitespaceProcessor']
 }
 
diff --git a/starter-core/build.gradle b/starter-core/build.gradle
index 13b05236758..d12eabb8bea 100644
--- a/starter-core/build.gradle
+++ b/starter-core/build.gradle
@@ -1,7 +1,7 @@
 import io.micronaut.internal.starter.tasks.WriteMicronautVersionInfoTask
 
 plugins {
-    id "io.micronaut.internal.starter.published-module"
+    id("io.micronaut.internal.starter.published-module")
     id "io.micronaut.internal.starter.convention"
     id "io.micronaut.starter.rocker"
     id "io.micronaut.internal.starter.coordinates"
@@ -50,6 +50,6 @@ TaskProvider<WriteMicronautVersionInfoTask> micronautVersionInfo = tasks.registe
 sourceSets.main.resources.srcDir(micronautVersionInfo)
 
 rocker {
-    javaVersion = '21'
+    javaVersion = '17'
     postProcessing = ['io.micronaut.starter.rocker.WhitespaceProcessor']
 }
diff --git a/starter-core/src/test/groovy/io/micronaut/starter/feature/build/KaptSpec.groovy b/starter-core/src/test/groovy/io/micronaut/starter/feature/build/KaptSpec.groovy
index 8217970c250..9fcff860c94 100644
--- a/starter-core/src/test/groovy/io/micronaut/starter/feature/build/KaptSpec.groovy
+++ b/starter-core/src/test/groovy/io/micronaut/starter/feature/build/KaptSpec.groovy
@@ -15,7 +15,6 @@ import io.micronaut.starter.options.JdkVersion
 import io.micronaut.starter.options.Language
 import io.micronaut.starter.options.Options
 import io.micronaut.starter.options.TestFramework
-import spock.lang.Ignore
 import spock.lang.Shared
 import spock.lang.Subject
 
@@ -147,15 +146,14 @@ class KaptSpec extends ApplicationContextSpec implements CommandOutputFixture {
         output.".mvn/jvm.config" == KotlinSupportFeature.JDK_21_KAPT_MODULES
     }
 
-    @Ignore
     void 'Corrected jdk21 = jdk17 is specified in build = #buildTool for kapt'(BuildTool buildTool) {
         when:
-        def output = generate(ApplicationType.DEFAULT, new Options(Language.KOTLIN, TestFramework.DEFAULT_OPTION, buildTool, JdkVersion.JDK_21),['kapt'])
-        def buildFile = buildTool == BuildTool.GRADLE ? output["build.gradle"] : output["build.gradle.kts"]
+        Map<String, String> output = generate(ApplicationType.DEFAULT, new Options(Language.KOTLIN, TestFramework.DEFAULT_OPTION, buildTool, JdkVersion.JDK_21),['kapt'])
+        String buildFile = buildTool == BuildTool.GRADLE ? output["build.gradle"] : output["build.gradle.kts"]
 
         then:
         buildFile
-        buildFile.contains('sourceCompatibility = JavaVersion.toVersion("17")')
+        buildFile.contains('sourceCompatibility = JavaVersion.toVersion("21")')
         !buildFile.contains('targetCompatibility = JavaVersion.toVersion("17")')
         !buildFile.contains('targetCompatibility = JavaVersion.toVersion("21")')
 
diff --git a/starter-core/src/test/groovy/io/micronaut/starter/feature/test/SpockSpec.groovy b/starter-core/src/test/groovy/io/micronaut/starter/feature/test/SpockSpec.groovy
index 00516a29823..cc8fc6a454e 100644
--- a/starter-core/src/test/groovy/io/micronaut/starter/feature/test/SpockSpec.groovy
+++ b/starter-core/src/test/groovy/io/micronaut/starter/feature/test/SpockSpec.groovy
@@ -6,7 +6,6 @@ import io.micronaut.starter.options.BuildTool
 import io.micronaut.starter.options.JdkVersion
 import io.micronaut.starter.options.Language
 import io.micronaut.starter.options.TestFramework
-import spock.lang.Ignore
 import spock.lang.Issue
 
 class SpockSpec extends ApplicationContextSpec {
@@ -78,8 +77,7 @@ tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
         Language.JAVA   | TestFramework.KOTEST
     }
 
-    @Ignore
-    void 'With #language, #testFramework and #jdk and kapt we use the kotlin toolchain for JDK17'() {
+    void 'With #language, #testFramework and #jdk and kapt we use the kotlin toolchain for JDK17'(Language language, TestFramework testFramework, JdkVersion jdk) {
         when:
         String template = new BuildBuilder(beanContext, BuildTool.GRADLE)
                 .language(language)
@@ -89,20 +87,35 @@ tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
                 .render()
 
         then:
-        template.contains('sourceCompatibility = JavaVersion.toVersion("17")')
+        template.contains('sourceCompatibility = JavaVersion.toVersion("' + jdk.majorVersion() + '")')
 
-        template.contains('''\
+        if (jdk.majorVersion() == 17) {
+            assert template.contains('''\
 kotlin {
     jvmToolchain {
         languageVersion.set(JavaLanguageVersion.of(17))
     }
 }''')
-        !template.contains('''\
+            assert !template.contains('''\
 tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
     compilerOptions {
         jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
     }
 }''')
+        } else if (jdk.majorVersion() == 21) {
+            assert template.contains('''\
+kotlin {
+    jvmToolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}''')
+            assert !template.contains('''\
+tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_21
+    }
+}''')
+        }
 
         where:
         language        | testFramework        | jdk
diff --git a/test-features/build.gradle b/test-features/build.gradle
index a6de7d34155..62f4ae7ad62 100644
--- a/test-features/build.gradle
+++ b/test-features/build.gradle
@@ -25,6 +25,6 @@ sourceSets {
 }
 
 rocker {
-    javaVersion = '21'
+    javaVersion = '17'
     postProcessing = ['io.micronaut.starter.rocker.WhitespaceProcessor']
 }