Kotlin-dsl-samples: Gradle 5.0 causes error Val cannot be reassigned when using Kotlin DSL in buid.gradle.kts

Created on 28 Nov 2018 · 16Comments · Source: gradle/kotlin-dsl-samples

Expected Behavior

I expect the build to complete successfully because when I use gradle 4.10.2 on the same build.gradle.kts file the error Val cannot be reassigned doesn't appear.

build.gradle.kts

@file:Suppress("SpellCheckingInspection")

import org.jetbrains.kotlin.gradle.dsl.KotlinCommonOptions
import org.jetbrains.kotlin.gradle.dsl.KotlinCommonToolOptions
import org.jetbrains.kotlin.gradle.dsl.KotlinCompile
import org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions

group = "app.example"
version = "0.0.1-SNAPSHOT"

buildscript {
    val kotlinVersion = "1.3.0"
    val springBootVersion = "2.1.0.RELEASE"

    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:$springBootVersion")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
        classpath("org.jetbrains.kotlin:kotlin-allopen:$kotlinVersion")
    }
}

repositories {
    mavenCentral()
}

plugins {
    java
    jacoco
    eclipse
}

apply(plugin = "kotlin")
apply(plugin = "kotlin-spring")
apply(plugin = "eclipse")
apply(plugin = "org.springframework.boot")
apply(plugin = "io.spring.dependency-management")


tasks {
    withType<KotlinCompile<KotlinJvmOptions>> {
        kotlinOptions.freeCompilerArgs = listOf("-Xjsr305=strict")
        kotlinOptions.jvmTarget = "1.8"
    }

    withType<JacocoReport> {
        reports {
            xml.isEnabled = false
            csv.isEnabled = false
            html.destination = file("$buildDir/jacocoHtml")
        }

        afterEvaluate {
            val filesToAvoidForCoverage = listOf(
                    "/dto",
                    "/config",
                    "MyApplicationKt.class"
            )
            val filesToCover = mutableListOf<String>()
            File("build/classes/kotlin/main/app/example/core/")
                    .walkTopDown()
                    .mapNotNull { file ->
                        var match = false
                        filesToAvoidForCoverage.forEach {
                            if (file.absolutePath.contains(it)) {
                                match = true
                            }
                        }
                        return@mapNotNull if (!match) {
                            file.absolutePath
                        } else {
                            null
                        }
                    }
                    .filter { it.contains(".class") }
                    .toCollection(filesToCover)

            classDirectories = files(filesToCover) // causes error
        }
    }
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-actuator")
    implementation("org.springframework.boot:spring-boot-starter-data-mongodb-reactive")
    implementation("org.springframework.boot:spring-boot-starter-security")
    implementation("org.springframework.boot:spring-boot-starter-webflux")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("io.jsonwebtoken:jjwt:0.9.1")
    runtimeOnly("org.springframework.boot:spring-boot-devtools")

    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.3.1")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
    testImplementation("de.flapdoodle.embed:de.flapdoodle.embed.mongo")
    testImplementation("io.projectreactor:reactor-test")
    testImplementation("org.springframework.security:spring-security-test")
    testImplementation("org.junit.jupiter:junit-jupiter-api:5.3.1")
}

stack trace

* Exception is:
ScriptCompilationException(errors=[ScriptCompilationError(message=Val cannot be reassigned, location=/private/var/folders/2w/9mw39xsn3lq41bm_c6k80sdr0000gn/T/gradle-kotlin-dsl-4566836874229877397.tmp/build.gradle.kts (80:13))])
        at org.gradle.kotlin.dsl.support.KotlinCompilerKt.compileKotlinScriptToDirectory(KotlinCompiler.kt:97)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler$compileScript$1.invoke(ResidualProgramCompiler.kt:562)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler$compileScript$1.invoke(ResidualProgramCompiler.kt:93)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost$runCompileBuildOperation$1.call(KotlinScriptEvaluator.kt:162)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost$runCompileBuildOperation$1.call(KotlinScriptEvaluator.kt:159)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:315)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:305)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:101)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.runCompileBuildOperation(KotlinScriptEvaluator.kt:159)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1$1$1$1$1.invoke(Interpreter.kt:482)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1$1$1$1$1.invoke(Interpreter.kt:355)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.compileScript(ResidualProgramCompiler.kt:561)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.compileScript$default(ResidualProgramCompiler.kt:559)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.emitStage2ProgramFor(ResidualProgramCompiler.kt:243)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1.invoke(Interpreter.kt:483)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1.invoke(Interpreter.kt:355)
        at org.gradle.kotlin.dsl.cache.ScriptCache.initializeCacheDir(ScriptCache.kt:113)
        at org.gradle.kotlin.dsl.cache.ScriptCache.access$initializeCacheDir(ScriptCache.kt:37)
        at org.gradle.kotlin.dsl.cache.ScriptCache$cacheDirFor$1.execute(ScriptCache.kt:60)
        at org.gradle.kotlin.dsl.cache.ScriptCache$cacheDirFor$1.execute(ScriptCache.kt:37)
        at org.gradle.cache.internal.DefaultPersistentDirectoryCache$Initializer.initialize(DefaultPersistentDirectoryCache.java:98)
        at org.gradle.cache.internal.FixedSharedModeCrossProcessCacheAccess$1.run(FixedSharedModeCrossProcessCacheAccess.java:85)
        at org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock.doWriteAction(DefaultFileLockManager.java:207)
        at org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock.writeFile(DefaultFileLockManager.java:197)
        at org.gradle.cache.internal.FixedSharedModeCrossProcessCacheAccess.open(FixedSharedModeCrossProcessCacheAccess.java:83)
        at org.gradle.cache.internal.DefaultCacheAccess.open(DefaultCacheAccess.java:141)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(DefaultPersistentDirectoryStore.java:78)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(DefaultPersistentDirectoryStore.java:42)
        at org.gradle.cache.internal.DefaultCacheFactory.doOpen(DefaultCacheFactory.java:94)
        at org.gradle.cache.internal.DefaultCacheFactory.open(DefaultCacheFactory.java:68)
        at org.gradle.cache.internal.DefaultCacheRepository$PersistentCacheBuilder.open(DefaultCacheRepository.java:117)
        at org.gradle.kotlin.dsl.cache.ScriptCache.cacheDirFor(ScriptCache.kt:67)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.cacheDirFor(KotlinScriptEvaluator.kt:253)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.cachedDirFor(KotlinScriptEvaluator.kt:242)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.compileSecondStageScript(Interpreter.kt:452)
        at Program.loadSecondStageFor(Unknown Source)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.evaluateSecondStageOf(Interpreter.kt:409)
        at Program.execute(Unknown Source)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.eval(Interpreter.kt:504)
        at org.gradle.kotlin.dsl.execution.Interpreter.eval(Interpreter.kt:182)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator.evaluate(KotlinScriptEvaluator.kt:114)
        at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:51)
        at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:36)
        at org.gradle.kotlin.dsl.provider.KotlinScriptPlugin.apply(KotlinScriptPlugin.kt:34)
        at org.gradle.configuration.BuildOperationScriptPlugin$1$1.run(BuildOperationScriptPlugin.java:69)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:66)
        at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:63)
        at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.apply(DefaultUserCodeApplicationContext.java:48)
        at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperationScriptPlugin.java:63)
        at org.gradle.configuration.project.BuildScriptProcessor$1.run(BuildScriptProcessor.java:44)
        at org.gradle.internal.Factories$1.create(Factories.java:25)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:200)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:186)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:41)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:26)
        at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
        at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject$1.run(LifecycleProjectEvaluator.java:107)
        at org.gradle.internal.Factories$1.create(Factories.java:25)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
        at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withProjectLock(DefaultProjectStateRegistry.java:226)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:220)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:186)
        at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.run(LifecycleProjectEvaluator.java:96)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:68)
        at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:687)
        at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:140)
        at org.gradle.execution.TaskPathProjectEvaluator.configure(TaskPathProjectEvaluator.java:35)
        at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:60)
        at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:41)
        at org.gradle.initialization.DefaultGradleLauncher$ConfigureBuild.run(DefaultGradleLauncher.java:286)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.initialization.DefaultGradleLauncher.configureBuild(DefaultGradleLauncher.java:194)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)
        at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:133)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:79)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:76)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:103)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:96)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
        at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
        at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:96)
        at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:76)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.run(RunAsBuildOperationBuildActionRunner.java:49)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:44)
        at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:47)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:44)
        at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:79)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:44)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:39)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:25)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:78)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:52)
        at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:62)
        at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:34)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:31)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:44)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:46)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:30)
        at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)
        at org.gradle.util.Swapper.swap(Swapper.java:38)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:62)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:81)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)
        at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:295)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)

Looking into the class JacocoReportBase I can see that the class property classDirectories is not final and a valid setter has been provided.

public abstract class JacocoReportBase extends JacocoBase {
    private FileCollection executionData;
    private FileCollection sourceDirectories;
    private FileCollection classDirectories;

    ...

    public void setClassDirectories(FileCollection classDirectories) {
        this.classDirectories = classDirectories;
    }

Current Behavior

Gradle spits out a Val cannot be reassigned error.

Context

I can no longer build my pipeline and would have to look into downgrading back to version 4.10.2

Steps to Reproduce (for bugs)

Try to set the classDirectories property in build.gradle.kts using Kotlin DSL.

Your Environment

locally on a Mac running High Sierra
gradle version 5.0
kotlin version 1.3.0

Source

clementohNZ

👍4

Most helpful comment

cool ~ this is working for me now classDirectories.setFrom(files(filesToCover)). Not really sure why it's working for me now though because I haven't changed from gradle tag v.5.0.0 😮 perhaps it was a local caching issue? either way I'll close this for now and upvote your stackoverflow answer 😄 Thank you @madhead !

clementohNZ on 3 Dec 2018

🎉3

All 16 comments

Can you provide the full stack trace?

JLLeitschuh on 28 Nov 2018

same thing has been happening with me after 5.0-rc-1
ie: a build file works fine with:
4.1
4.2
4.10
5.0-rc-1

but, results in this error with
5.0rc-2
5.0-rc-3, and
5.0 (ie: the release version):

* What went wrong:
Script compilation errors:

  Line 307:     classDirectories = files("build/classes")
                ^ Val cannot be reassigned

  Line 308:     sourceDirectories = files("src/main")
                ^ Val cannot be reassigned

2 errors

if I rollback to 5.0-rc-1 the error goes away !

davidmoshal on 29 Nov 2018

Here is the full stacktrace:

org.gradle.api.ProjectConfigurationException: A problem occurred configuring root project 'au-vertx-kotlin'.
    at org.gradle.configuration.project.LifecycleProjectEvaluator.wrapException(LifecycleProjectEvaluator.java:80)
    at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:73)
    at org.gradle.configuration.project.LifecycleProjectEvaluator.access$600(LifecycleProjectEvaluator.java:54)
    at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject$1.run(LifecycleProjectEvaluator.java:109)
    at org.gradle.internal.Factories$1.create(Factories.java:25)
    at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
    at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
    at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withProjectLock(DefaultProjectStateRegistry.java:226)
    at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:220)
    at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:186)
    at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.run(LifecycleProjectEvaluator.java:96)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
    at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:68)
    at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:687)
    at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:140)
    at org.gradle.execution.TaskPathProjectEvaluator.configure(TaskPathProjectEvaluator.java:35)
    at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:60)
    at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:41)
    at org.gradle.initialization.DefaultGradleLauncher$ConfigureBuild.run(DefaultGradleLauncher.java:286)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
    at org.gradle.initialization.DefaultGradleLauncher.configureBuild(DefaultGradleLauncher.java:194)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)
    at org.gradle.initialization.DefaultGradleLauncher.getConfiguredBuild(DefaultGradleLauncher.java:128)
    at org.gradle.internal.invocation.GradleBuildController$2.execute(GradleBuildController.java:88)
    at org.gradle.internal.invocation.GradleBuildController$2.execute(GradleBuildController.java:85)
    at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:103)
    at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:96)
    at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
    at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
    at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:96)
    at org.gradle.internal.invocation.GradleBuildController.configure(GradleBuildController.java:85)
    at org.gradle.tooling.internal.provider.runner.ClientProvidedBuildActionRunner.run(ClientProvidedBuildActionRunner.java:70)
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
    at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32)
    at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.run(RunAsBuildOperationBuildActionRunner.java:49)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
    at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:44)
    at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:47)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:44)
    at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:79)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:44)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)
    at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:39)
    at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:25)
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:78)
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:52)
    at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:62)
    at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:34)
    at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36)
    at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25)
    at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43)
    at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29)
    at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:59)
    at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:31)
    at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:59)
    at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:44)
    at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:46)
    at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:30)
    at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)
    at org.gradle.util.Swapper.swap(Swapper.java:38)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:62)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:81)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
    at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)
    at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:295)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.gradle.cache.CacheOpenException: Could not open cache directory 525rgsltw9he6towcfarjxr1s (/home/davem/.sdkman/candidates/gradle/5.0-rc-1/caches/5.0/gradle-kotlin-dsl/525rgsltw9he6towcfarjxr1s).
    at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(DefaultPersistentDirectoryStore.java:80)
    at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(DefaultPersistentDirectoryStore.java:42)
    at org.gradle.cache.internal.DefaultCacheFactory.doOpen(DefaultCacheFactory.java:94)
    at org.gradle.cache.internal.DefaultCacheFactory.open(DefaultCacheFactory.java:68)
    at org.gradle.cache.internal.DefaultCacheRepository$PersistentCacheBuilder.open(DefaultCacheRepository.java:117)
    at org.gradle.kotlin.dsl.cache.ScriptCache.cacheDirFor(ScriptCache.kt:67)
    at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.cacheDirFor(KotlinScriptEvaluator.kt:253)
    at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.cachedDirFor(KotlinScriptEvaluator.kt:242)
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.compileSecondStageScript(Interpreter.kt:452)
    at Program.loadSecondStageFor(Unknown Source)
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.evaluateSecondStageOf(Interpreter.kt:409)
    at Program.execute(Unknown Source)
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.eval(Interpreter.kt:504)
    at org.gradle.kotlin.dsl.execution.Interpreter.eval(Interpreter.kt:204)
    at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator.evaluate(KotlinScriptEvaluator.kt:114)
    at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:51)
    at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:36)
    at org.gradle.kotlin.dsl.provider.KotlinScriptPlugin.apply(KotlinScriptPlugin.kt:34)
    at org.gradle.configuration.BuildOperationScriptPlugin$1$1.run(BuildOperationScriptPlugin.java:69)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
    at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:66)
    at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:63)
    at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.apply(DefaultUserCodeApplicationContext.java:48)
    at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperationScriptPlugin.java:63)
    at org.gradle.configuration.project.BuildScriptProcessor$1.run(BuildScriptProcessor.java:44)
    at org.gradle.internal.Factories$1.create(Factories.java:25)
    at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:200)
    at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:186)
    at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:41)
    at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:26)
    at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
    at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject$1.run(LifecycleProjectEvaluator.java:107)
    ... 98 more
Caused by: org.gradle.internal.exceptions.LocationAwareException: Build file '/home/davem/au/codebase/au-2016/au-vertx-kotlin/build.gradle.kts' line: 307
Script compilation errors:

  Line 307:     classDirectories = files("build/classes")
                ^ Val cannot be reassigned

  Line 308:     sourceDirectories = files("src/main")
                ^ Val cannot be reassigned

2 errors
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1.invoke(Interpreter.kt:630)
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1.invoke(Interpreter.kt:355)
    at org.gradle.kotlin.dsl.cache.ScriptCache.initializeCacheDir(ScriptCache.kt:101)
    at org.gradle.kotlin.dsl.cache.ScriptCache.access$initializeCacheDir(ScriptCache.kt:37)
    at org.gradle.kotlin.dsl.cache.ScriptCache$cacheDirFor$1.execute(ScriptCache.kt:60)
    at org.gradle.kotlin.dsl.cache.ScriptCache$cacheDirFor$1.execute(ScriptCache.kt:37)
    at org.gradle.cache.internal.DefaultPersistentDirectoryCache$Initializer.initialize(DefaultPersistentDirectoryCache.java:98)
    at org.gradle.cache.internal.FixedSharedModeCrossProcessCacheAccess$1.run(FixedSharedModeCrossProcessCacheAccess.java:85)
    at org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock.doWriteAction(DefaultFileLockManager.java:207)
    at org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock.writeFile(DefaultFileLockManager.java:197)
    at org.gradle.cache.internal.FixedSharedModeCrossProcessCacheAccess.open(FixedSharedModeCrossProcessCacheAccess.java:83)
    at org.gradle.cache.internal.DefaultCacheAccess.open(DefaultCacheAccess.java:141)
    at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(DefaultPersistentDirectoryStore.java:78)
    ... 133 more
Caused by: ScriptCompilationException(errors=[ScriptCompilationError(message=Val cannot be reassigned, location=/tmp/gradle-kotlin-dsl-3904255216401523068.tmp/build.gradle.kts (307:5)), ScriptCompilationError(message=Val cannot be reassigned, location=/tmp/gradle-kotlin-dsl-3904255216401523068.tmp/build.gradle.kts (308:5))])
    at org.gradle.kotlin.dsl.support.KotlinCompilerKt.compileKotlinScriptToDirectory(KotlinCompiler.kt:97)
    at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler$compileScript$1.invoke(ResidualProgramCompiler.kt:562)
    at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler$compileScript$1.invoke(ResidualProgramCompiler.kt:93)
    at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost$runCompileBuildOperation$1.call(KotlinScriptEvaluator.kt:162)
    at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost$runCompileBuildOperation$1.call(KotlinScriptEvaluator.kt:159)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:315)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:305)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:101)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
    at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.runCompileBuildOperation(KotlinScriptEvaluator.kt:159)
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1$1$1$1$1.invoke(Interpreter.kt:482)
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1$1$1$1$1.invoke(Interpreter.kt:355)
    at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.compileScript(ResidualProgramCompiler.kt:561)
    at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.compileScript$default(ResidualProgramCompiler.kt:559)
    at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.emitStage2ProgramFor(ResidualProgramCompiler.kt:243)
    at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1.invoke(Interpreter.kt:483)
    ... 145 more

and here are the relevant lines in the build file, lines 307 and 308 are marked below:

tasks.withType<JacocoReport> {
    dependsOn("test")
    reports {
        html.apply {
            isEnabled = true
            //destination = File("reports/jacoco.xml") // defaults to: File("build/reports/jacoco.xml")
        }
        executionData(tasks.withType<Test>())
    }
    classDirectories = files("build/classes")    # line 307
    sourceDirectories = files("src/main")        # line 308
}

NOTE: commenting out the JacocoReport task resolved the problem.
(I'm not currently using that task anyway).

davidmoshal on 29 Nov 2018

Apologies for the late reply @JLLeitschuh haven't been free since haha. I have included the stack trace above :)

clementohNZ on 29 Nov 2018

👍2

Running into this too. How do you guys get the Kotlin compiler stacktrace?

jivimberg on 29 Nov 2018

@jivimberg you can add the --stacktrace option to your gradle command e.g. gradle dependencies --stacktrace :)

clementohNZ on 29 Nov 2018

I'm also seeing Val cannot be reassigned on Gradle 5.0 with JaCoCo.

tasks.withType<JacocoReport> {
    doFirst {
        classDirectories = fileTree("build/classes/kotlin/main").apply {
            exclude("**/*\$run$1.class")
        }

        reports {
            html.isEnabled = true
            xml.isEnabled = true
        }
    }
}

  Line 28:         classDirectories = fileTree("build/classes/kotlin/main").apply {
                   ^ Val cannot be reassigned

 ./gradlew clean --stacktrace

> Configure project :
e: /Users/user/code/flank/test_runner/build.gradle.kts:28:9: Val cannot be reassigned
e: /Users/user/code/flank/test_runner/build.gradle.kts:28:28: Type mismatch: inferred type is ConfigurableFileTree but ConfigurableFileCollection! was expected
e: /Users/user/code/flank/test_runner/build.gradle.kts:28:66: Type mismatch: inferred type is ConfigurableFileTree but ConfigurableFileCollection! was expected

FAILURE: Build failed with an exception.

* Where:
Build file '/Users/user/code/flank/test_runner/build.gradle.kts' line: 28

* What went wrong:
Script compilation errors:

  Line 28:         classDirectories = fileTree("build/classes/kotlin/main").apply {
                   ^ Val cannot be reassigned

  Line 28:         classDirectories = fileTree("build/classes/kotlin/main").apply {
                                      ^ Type mismatch: inferred type is ConfigurableFileTree but ConfigurableFileCollection! was expected

  Line 28:         classDirectories = fileTree("build/classes/kotlin/main").apply {
                                                                            ^ Type mismatch: inferred type is ConfigurableFileTree but ConfigurableFileCollection! was expected

3 errors

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
ScriptCompilationException(errors=[ScriptCompilationError(message=Val cannot be reassigned, location=/private/var/folders/14/h2zk5sx1315b__blzdt7hz1m4k0by8/T/gradle-kotlin-dsl-5713916682901633581.tmp/build.gradle.kts (28:9)), ScriptCompilationError(message=Type mismatch: inferred type is ConfigurableFileTree but ConfigurableFileCollection! was expected, location=/private/var/folders/14/h2zk5sx1315b__blzdt7hz1m4k0by8/T/gradle-kotlin-dsl-5713916682901633581.tmp/build.gradle.kts (28:28)), ScriptCompilationError(message=Type mismatch: inferred type is ConfigurableFileTree but ConfigurableFileCollection! was expected, location=/private/var/folders/14/h2zk5sx1315b__blzdt7hz1m4k0by8/T/gradle-kotlin-dsl-5713916682901633581.tmp/build.gradle.kts (28:66))])
        at org.gradle.kotlin.dsl.support.KotlinCompilerKt.compileKotlinScriptToDirectory(KotlinCompiler.kt:97)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler$compileScript$1.invoke(ResidualProgramCompiler.kt:562)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler$compileScript$1.invoke(ResidualProgramCompiler.kt:93)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost$runCompileBuildOperation$1.call(KotlinScriptEvaluator.kt:162)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost$runCompileBuildOperation$1.call(KotlinScriptEvaluator.kt:159)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:315)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:305)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:101)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.runCompileBuildOperation(KotlinScriptEvaluator.kt:159)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1$1$1$1$1.invoke(Interpreter.kt:482)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1$1$1$1$1.invoke(Interpreter.kt:355)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.compileScript(ResidualProgramCompiler.kt:561)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.compileScript$default(ResidualProgramCompiler.kt:559)
        at org.gradle.kotlin.dsl.execution.ResidualProgramCompiler.emitStage2ProgramFor(ResidualProgramCompiler.kt:243)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1.invoke(Interpreter.kt:483)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost$compileSecondStageScript$cacheDir$1.invoke(Interpreter.kt:355)
        at org.gradle.kotlin.dsl.cache.ScriptCache.initializeCacheDir(ScriptCache.kt:113)
        at org.gradle.kotlin.dsl.cache.ScriptCache.access$initializeCacheDir(ScriptCache.kt:37)
        at org.gradle.kotlin.dsl.cache.ScriptCache$cacheDirFor$1.execute(ScriptCache.kt:60)
        at org.gradle.kotlin.dsl.cache.ScriptCache$cacheDirFor$1.execute(ScriptCache.kt:37)
        at org.gradle.cache.internal.DefaultPersistentDirectoryCache$Initializer.initialize(DefaultPersistentDirectoryCache.java:98)
        at org.gradle.cache.internal.FixedSharedModeCrossProcessCacheAccess$1.run(FixedSharedModeCrossProcessCacheAccess.java:85)
        at org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock.doWriteAction(DefaultFileLockManager.java:207)
        at org.gradle.cache.internal.DefaultFileLockManager$DefaultFileLock.writeFile(DefaultFileLockManager.java:197)
        at org.gradle.cache.internal.FixedSharedModeCrossProcessCacheAccess.open(FixedSharedModeCrossProcessCacheAccess.java:83)
        at org.gradle.cache.internal.DefaultCacheAccess.open(DefaultCacheAccess.java:141)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(DefaultPersistentDirectoryStore.java:78)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(DefaultPersistentDirectoryStore.java:42)
        at org.gradle.cache.internal.DefaultCacheFactory.doOpen(DefaultCacheFactory.java:94)
        at org.gradle.cache.internal.DefaultCacheFactory.open(DefaultCacheFactory.java:68)
        at org.gradle.cache.internal.DefaultCacheRepository$PersistentCacheBuilder.open(DefaultCacheRepository.java:117)
        at org.gradle.kotlin.dsl.cache.ScriptCache.cacheDirFor(ScriptCache.kt:67)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.cacheDirFor(KotlinScriptEvaluator.kt:253)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator$InterpreterHost.cachedDirFor(KotlinScriptEvaluator.kt:242)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.compileSecondStageScript(Interpreter.kt:452)
        at Program.loadSecondStageFor(Unknown Source)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.evaluateSecondStageOf(Interpreter.kt:409)
        at Program.execute(Unknown Source)
        at org.gradle.kotlin.dsl.execution.Interpreter$ProgramHost.eval(Interpreter.kt:504)
        at org.gradle.kotlin.dsl.execution.Interpreter.eval(Interpreter.kt:182)
        at org.gradle.kotlin.dsl.provider.StandardKotlinScriptEvaluator.evaluate(KotlinScriptEvaluator.kt:114)
        at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:51)
        at org.gradle.kotlin.dsl.provider.KotlinScriptPluginFactory$create$1.invoke(KotlinScriptPluginFactory.kt:36)
        at org.gradle.kotlin.dsl.provider.KotlinScriptPlugin.apply(KotlinScriptPlugin.kt:34)
        at org.gradle.configuration.BuildOperationScriptPlugin$1$1.run(BuildOperationScriptPlugin.java:69)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:66)
        at org.gradle.configuration.BuildOperationScriptPlugin$1.execute(BuildOperationScriptPlugin.java:63)
        at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.apply(DefaultUserCodeApplicationContext.java:48)
        at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperationScriptPlugin.java:63)
        at org.gradle.configuration.project.BuildScriptProcessor$1.run(BuildScriptProcessor.java:44)
        at org.gradle.internal.Factories$1.create(Factories.java:25)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:200)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:186)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:41)
        at org.gradle.configuration.project.BuildScriptProcessor.execute(BuildScriptProcessor.java:26)
        at org.gradle.configuration.project.ConfigureActionsProjectEvaluator.evaluate(ConfigureActionsProjectEvaluator.java:34)
        at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject$1.run(LifecycleProjectEvaluator.java:107)
        at org.gradle.internal.Factories$1.create(Factories.java:25)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
        at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withProjectLock(DefaultProjectStateRegistry.java:226)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:220)
        at org.gradle.api.internal.project.DefaultProjectStateRegistry$ProjectStateImpl.withMutableState(DefaultProjectStateRegistry.java:186)
        at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.run(LifecycleProjectEvaluator.java:96)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:68)
        at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:687)
        at org.gradle.api.internal.project.DefaultProject.evaluate(DefaultProject.java:140)
        at org.gradle.execution.TaskPathProjectEvaluator.configure(TaskPathProjectEvaluator.java:35)
        at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:60)
        at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:41)
        at org.gradle.initialization.DefaultGradleLauncher$ConfigureBuild.run(DefaultGradleLauncher.java:286)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.initialization.DefaultGradleLauncher.configureBuild(DefaultGradleLauncher.java:194)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)
        at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:133)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:79)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:76)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:103)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:96)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
        at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
        at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:96)
        at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:76)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.run(RunAsBuildOperationBuildActionRunner.java:49)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:301)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:293)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:175)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:44)
        at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:47)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:44)
        at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:79)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:44)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:39)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:25)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:78)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:52)
        at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:62)
        at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:34)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:36)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:25)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:31)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:44)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:46)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:30)
        at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:37)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72)
        at org.gradle.util.Swapper.swap(Swapper.java:38)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:62)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:81)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:122)
        at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50)
        at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:295)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55)


* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.0/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 0s

bootstraponline on 29 Nov 2018

Looks like classDirectories actually is not a writible property anymore: if you look at the source getClassDirectories has return type of ConfigurableFileCollection and setClassDirectories accepts FileCollection. So this is not a valid Java Beans property, because getter and setter operate on different types. So only getter is seen by Kotlin as val and assignments are not supported. It's a feature.

You can either try to call setClassDirectories directly (setClassDirectories(…) instead of classDirectories = …), or to use classDirectories.setFrom, as suggested by the Javadocs.

madhead on 1 Dec 2018

👍2

Thank you! classDirectories.setFrom solved the issue.

bootstraponline on 1 Dec 2018

👍1

@madhead @bootstraponline just wondering where the setFrom method comes from because I can't seem to find it.

I'm currently using the manual calling of the setter like so:

@Suppress("UsePropertyAccessSyntax")
setClassDirectories(files(filesToCover))

Cheers :)

clementohNZ on 2 Dec 2018

It's here.

madhead on 2 Dec 2018

Just wondering if there's a version difference for us because when I look at the getter it returns a FileCollection not a ConfigurableFileCollection so the setFrom method is not available to me.

@PathSensitive(PathSensitivity.RELATIVE)
@InputFiles
public FileCollection getClassDirectories() {
    return classDirectories;
}

Cheers :)

clementohNZ on 2 Dec 2018

@clementohNZ, take a look at this commit: https://github.com/gradle/gradle/commit/76fecd4f823a1108f0044a2269aad92383a6660e.

madhead on 2 Dec 2018

🎉2

awesome! I'll get the right version and report back :) thanks @madhead

clementohNZ on 2 Dec 2018

👍1

Might explain why Gradle version > 5.0-rc-1 failed with this error?

davidmoshal on 2 Dec 2018

clementohNZ on 3 Dec 2018

🎉3

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