Android Studio Question posted in
The official documentation can be found here.

Error :app:kaptGenerateStubsDebugKotlin and Unknown Kotlin JVM target: 21 after changing Android studio from Iguana to LadyBug

Please help. I changed Android studio from Iguana to LadyBug and the project does not compile. There are two errors during compilation :app:kaptGenerateStubsDebugKotlin’ and Unknown Kotlin JVM target: 21:

Execution failed for task ':app:kaptGenerateStubsDebugKotlin'.
> Error while evaluating property 'compilerOptions.jvmTarget' of task ':app:kaptGenerateStubsDebugKotlin'.
   > Failed to calculate the value of property 'jvmTarget'.
      > Unknown Kotlin JVM target: 21

I reinstalled the JVM and JDK. Like all implementations, I added them in current versions.

Here is my gradle file:
…

plugins {
    id("com.android.application")
    id("org.jetbrains.kotlin.android")
    id("org.jetbrains.kotlin.kapt")
}

android {
    namespace = "com.ollo.stopsindicator"
    compileSdk = 34

    defaultConfig {
        applicationId = "com.ollo.stopsindicator"
        minSdk = 26
        targetSdk = 34
        versionCode = 28
        versionName = "1.28"

        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables {
            useSupportLibrary = true
        }
    }

    buildTypes {
        release {
            isMinifyEnabled = false
            proguardFiles(
                getDefaultProguardFile("proguard-android-optimize.txt"),
                "proguard-rules.pro"
            )
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
    kotlinOptions {
        jvmTarget = "1.8"
    }
    buildFeatures {
        compose = true
    }
    composeOptions {
        kotlinCompilerExtensionVersion = "1.5.15"

    }
    packaging {
        resources {
            excludes += "/META-INF/{AL2.0,LGPL2.1}"
        }
    }
}
dependencies {
    implementation("androidx.core:core-ktx:1.13.1")
    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.6.2")
    implementation("androidx.activity:activity-compose:1.8.2")
    implementation(platform("androidx.compose:compose-bom:2024.09.00"))
    implementation("androidx.compose.ui:ui")
    implementation("androidx.compose.ui:ui-graphics")
    implementation("androidx.compose.ui:ui-tooling-preview")
    implementation("androidx.compose.material3:material3")
    implementation("androidx.appcompat:appcompat:1.6.1")
    testImplementation("junit:junit:4.13.2")
    androidTestImplementation("androidx.test.ext:junit:1.1.5")
    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
    implementation("com.tom-roush:pdfbox-android:2.0.27.0")
    implementation ("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3")
}

I have no idea why the JVM Target is 21, I haven’t set anything like that anywhere.
…

FAILURE: Build failed with an exception.
Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:kaptGenerateStubsDebugKotlin'.
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:38)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:209)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:166)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
    at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:331)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:318)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.lambda$execute$0(DefaultTaskExecutionGraph.java:314)
    at org.gradle.internal.operations.CurrentBuildOperationRef.with(CurrentBuildOperationRef.java:85)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:314)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:303)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:459)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:376)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
    at org.gradle.internal.concurrent.AbstractManagedExecutor$1.run(AbstractManagedExecutor.java:48)
Caused by: org.gradle.api.internal.tasks.properties.PropertyEvaluationException: Error while evaluating property 'compilerOptions.jvmTarget' of task ':app:kaptGenerateStubsDebugKotlin'.
    at org.gradle.api.internal.tasks.properties.InputParameterUtils.prepareInputParameterValue(InputParameterUtils.java:32)
    at org.gradle.api.internal.tasks.execution.TaskExecution.lambda$visitRegularInputs$1(TaskExecution.java:317)
    at org.gradle.internal.execution.impl.DefaultInputFingerprinter$InputCollectingVisitor.visitInputProperty(DefaultInputFingerprinter.java:103)
    at org.gradle.api.internal.tasks.execution.TaskExecution.visitRegularInputs(TaskExecution.java:315)
    at org.gradle.internal.execution.impl.DefaultInputFingerprinter.fingerprintInputProperties(DefaultInputFingerprinter.java:63)
    at org.gradle.internal.execution.steps.AbstractCaptureStateBeforeExecutionStep.captureExecutionStateWithOutputs(AbstractCaptureStateBeforeExecutionStep.java:109)
    at org.gradle.internal.execution.steps.AbstractCaptureStateBeforeExecutionStep.lambda$captureExecutionState$0(AbstractCaptureStateBeforeExecutionStep.java:74)
    at org.gradle.internal.execution.steps.BuildOperationStep$1.call(BuildOperationStep.java:37)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:209)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:166)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
    at org.gradle.internal.execution.steps.BuildOperationStep.operation(BuildOperationStep.java:34)
    at org.gradle.internal.execution.steps.AbstractCaptureStateBeforeExecutionStep.captureExecutionState(AbstractCaptureStateBeforeExecutionStep.java:69)
    at org.gradle.internal.execution.steps.AbstractCaptureStateBeforeExecutionStep.execute(AbstractCaptureStateBeforeExecutionStep.java:62)
    at org.gradle.internal.execution.steps.AbstractCaptureStateBeforeExecutionStep.execute(AbstractCaptureStateBeforeExecutionStep.java:43)
    at org.gradle.internal.execution.steps.AbstractSkipEmptyWorkStep.executeWithNonEmptySources(AbstractSkipEmptyWorkStep.java:125)
    at org.gradle.internal.execution.steps.AbstractSkipEmptyWorkStep.execute(AbstractSkipEmptyWorkStep.java:56)
    at org.gradle.internal.execution.steps.AbstractSkipEmptyWorkStep.execute(AbstractSkipEmptyWorkStep.java:36)
    at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:38)
    at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:36)
    at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:23)
    at org.gradle.internal.execution.steps.HandleStaleOutputsStep.execute(HandleStaleOutputsStep.java:75)
    at org.gradle.internal.execution.steps.HandleStaleOutputsStep.execute(HandleStaleOutputsStep.java:41)
    at org.gradle.internal.execution.steps.AssignMutableWorkspaceStep.lambda$execute$0(AssignMutableWorkspaceStep.java:35)
    at org.gradle.api.internal.tasks.execution.TaskExecution$4.withWorkspace(TaskExecution.java:289)
    at org.gradle.internal.execution.steps.AssignMutableWorkspaceStep.execute(AssignMutableWorkspaceStep.java:31)
    at org.gradle.internal.execution.steps.AssignMutableWorkspaceStep.execute(AssignMutableWorkspaceStep.java:22)
    at org.gradle.internal.execution.steps.ChoosePipelineStep.execute(ChoosePipelineStep.java:40)
    at org.gradle.internal.execution.steps.ChoosePipelineStep.execute(ChoosePipelineStep.java:23)
    at org.gradle.internal.execution.steps.ExecuteWorkBuildOperationFiringStep.lambda$execute$2(ExecuteWorkBuildOperationFiringStep.java:67)
    at org.gradle.internal.execution.steps.ExecuteWorkBuildOperationFiringStep.execute(ExecuteWorkBuildOperationFiringStep.java:67)
    at org.gradle.internal.execution.steps.ExecuteWorkBuildOperationFiringStep.execute(ExecuteWorkBuildOperationFiringStep.java:39)
    at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:46)
    at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:34)
    at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:48)
    at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:35)
    at org.gradle.internal.execution.impl.DefaultExecutionEngine$1.execute(DefaultExecutionEngine.java:61)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:127)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:116)
    at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)
    at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:209)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
    at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:166)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
    at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
    at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:331)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:318)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.lambda$execute$0(DefaultTaskExecutionGraph.java:314)
    at org.gradle.internal.operations.CurrentBuildOperationRef.with(CurrentBuildOperationRef.java:85)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:314)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:303)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:459)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:376)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
    at org.gradle.internal.concurrent.AbstractManagedExecutor$1.run(AbstractManagedExecutor.java:48)
Caused by: org.gradle.api.internal.provider.AbstractProperty$PropertyQueryException: Failed to calculate the value of property 'jvmTarget'.
    at org.gradle.api.internal.provider.AbstractProperty.finalizeNow(AbstractProperty.java:284)
    at org.gradle.api.internal.provider.AbstractProperty.lambda$beforeRead$0(AbstractProperty.java:276)
    at org.gradle.api.internal.provider.ValueState.finalizeOnReadIfNeeded(ValueState.java:139)
    at org.gradle.api.internal.provider.AbstractProperty.beforeRead(AbstractProperty.java:276)
    at org.gradle.api.internal.provider.AbstractProperty.beforeRead(AbstractProperty.java:268)
    at org.gradle.api.internal.provider.AbstractProperty.calculateOwnValue(AbstractProperty.java:162)
    at org.gradle.api.internal.provider.AbstractMinimalProvider.getOrNull(AbstractMinimalProvider.java:105)
    at org.gradle.api.internal.provider.ProviderResolutionStrategy$1.resolve(ProviderResolutionStrategy.java:27)
    at org.gradle.util.internal.DeferredUtil.unpack(DeferredUtil.java:59)
    at org.gradle.util.internal.DeferredUtil.unpackOrNull(DeferredUtil.java:49)
    at org.gradle.api.internal.tasks.properties.InputParameterUtils.prepareInputParameterValue(InputParameterUtils.java:38)
    at org.gradle.api.internal.tasks.properties.InputParameterUtils.prepareInputParameterValue(InputParameterUtils.java:30)
    ... 69 more
Caused by: java.lang.IllegalArgumentException: Unknown Kotlin JVM target: 21
    at org.jetbrains.kotlin.gradle.dsl.JvmTarget$Companion.fromTarget(JvmTarget.kt:26)
    at org.jetbrains.kotlin.gradle.tasks.DefaultKotlinJavaToolchain$wireJvmTargetToToolchain$1$1.invoke(DefaultKotlinJavaToolchain.kt:78)
    at org.jetbrains.kotlin.gradle.tasks.DefaultKotlinJavaToolchain$wireJvmTargetToToolchain$1$1.invoke(DefaultKotlinJavaToolchain.kt:70)
    at org.jetbrains.kotlin.gradle.tasks.DefaultKotlinJavaToolchain$sam$org_gradle_api_Transformer$0.transform(DefaultKotlinJavaToolchain.kt)
    at org.gradle.api.internal.provider.ValueSupplier$Present.transform(ValueSupplier.java:518)
    at org.gradle.api.internal.provider.TransformBackedProvider.mapValue(TransformBackedProvider.java:91)
    at org.gradle.api.internal.provider.TransformBackedProvider.calculateOwnValue(TransformBackedProvider.java:82)
    at org.gradle.api.internal.provider.AbstractMinimalProvider.calculateValue(AbstractMinimalProvider.java:115)
    at org.gradle.api.internal.provider.TransformBackedProvider.calculateOwnValue(TransformBackedProvider.java:81)
    at org.gradle.api.internal.provider.AbstractMinimalProvider.calculateValue(AbstractMinimalProvider.java:115)
    at org.gradle.api.internal.provider.AbstractMinimalProvider.withFinalValue(AbstractMinimalProvider.java:168)
    at org.gradle.api.internal.provider.DefaultProperty.finalValue(DefaultProperty.java:162)
    at org.gradle.api.internal.provider.DefaultProperty.finalValue(DefaultProperty.java:33)
    at org.gradle.api.internal.provider.AbstractProperty.finalizeNow(AbstractProperty.java:281)
    ... 80 more
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I hope my experiences will help someone. The most important thing is to fill in carefully to the exact selection of configuration in the build.gradle.kts(app) file.

    I made the following changes to run the project I wrote in Android Studio Iguana. It didn't work on Android Studio Lady Bug. I installed Android Studio Koala Feature Drop and then made changes to the configuration.

    The most important thing for everything to work was to select Compose to Kotlin Compatibility Map:

    https://developer.android.com/jetpack/androidx/releases/compose-kotlin

    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_17
        targetCompatibility = JavaVersion.VERSION_17
    }
    kotlinOptions {
        jvmTarget = "17"
    }
    buildFeatures {
        compose = true
    }
    composeOptions {
        kotlinCompilerExtensionVersion = "1.4.2"
    }

    And once again, big thanks to Robert, who gave me the hint to check the configuration.


  2. 0

    I had the same problem, just change the JDK in Settings -> build, execution, deployment -> build tools -> gradle.
    With the new android studio it updated the JDK to 21, even though the Java targeting version was 17.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search