# How to debug gradle failure with "String index out of range: 0"

**URL:** <https://discuss.gradle.org/t/how-to-debug-gradle-failure-with-string-index-out-of-range-0/24732>\
**Category:** Help/Discuss\
**Created:** [November 10, 2017, 9:03am UTC](https://discuss.gradle.org/t/how-to-debug-gradle-failure-with-string-index-out-of-range-0/24732 "2017-11-10T09:03:18Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![davidrichardson](https://sea1.discourse-cdn.com/gradle/user_avatar/discuss.gradle.org/davidrichardson/32/6592_2.png) [@davidrichardson](https://discuss.gradle.org/u/davidrichardson)\
**Post date:** [November 10, 2017, 9:03am UTC](https://discuss.gradle.org/t/how-to-debug-gradle-failure-with-string-index-out-of-range-0/24732/1 "2017-11-10T09:03:18Z")

</div>

Hi,

I’ve run into a frustrating bug in the last few days. Everytime I run gradle, irrespective of which repo or task I use, I get an error - “String index out of range: 0”

I don’t know what version of gradle I was using when the problem occurred, but I’ve upgraded to 4.3.1 and still get the same error. The only changes I’m aware of making are upgrading macos to High Sierra, and the SSD file system being updated to APFS.

Colleagues have made the same change without any problems.

To rule out a problem with our projects, I’ve reproduced the problem with the gradle repo from github (output below). I’m not sure how to proceed here, any advice would be welcome.

> **Output of ./gradlew tasks --stacktrace**
>
> ./gradlew tasks --stacktrace
> 
> FAILURE: Build failed with an exception.
> 
> - What went wrong:  
> String index out of range: 0
> 
> - Try:  
> Run with --info or --debug option to get more log output.
> 
> - Exception is:  
> java.lang.StringIndexOutOfBoundsException: String index out of range: 0  
> at org.gradle.internal.reflect.JavaReflectionUtil.toMethodName(JavaReflectionUtil.java:158)  
> at org.gradle.internal.reflect.JavaReflectionUtil.writeablePropertyIfExists(JavaReflectionUtil.java:126)  
> at org.gradle.initialization.ProjectPropertySettingBuildLoader$CachingPropertyApplicator.configureProperty(ProjectPropertySettingBuildLoader.java:102)  
> at org.gradle.initialization.ProjectPropertySettingBuildLoader.addPropertiesToProject(ProjectPropertySettingBuildLoader.java:77)  
> at org.gradle.initialization.ProjectPropertySettingBuildLoader.setProjectProperties(ProjectPropertySettingBuildLoader.java:54)  
> at org.gradle.initialization.ProjectPropertySettingBuildLoader.load(ProjectPropertySettingBuildLoader.java:50)  
> at org.gradle.initialization.NotifyingBuildLoader$1.call(NotifyingBuildLoader.java:54)  
> at org.gradle.initialization.NotifyingBuildLoader$1.call(NotifyingBuildLoader.java:44)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:350)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:340)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:120)  
> at org.gradle.initialization.NotifyingBuildLoader.load(NotifyingBuildLoader.java:44)  
> at org.gradle.initialization.DefaultGradleLauncher$ConfigureBuild.run(DefaultGradleLauncher.java:248)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)  
> at org.gradle.initialization.DefaultGradleLauncher.configureBuild(DefaultGradleLauncher.java:167)  
> at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:126)  
> at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:109)  
> at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:78)  
> at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:75)  
> at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:152)  
> at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:100)  
> at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:75)  
> at org.gradle.initialization.buildsrc.BuildSrcUpdateFactory.build(BuildSrcUpdateFactory.java:63)  
> at org.gradle.initialization.buildsrc.BuildSrcUpdateFactory.create(BuildSrcUpdateFactory.java:48)  
> at org.gradle.initialization.buildsrc.BuildSrcUpdateFactory.create(BuildSrcUpdateFactory.java:32)  
> at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:217)  
> at org.gradle.cache.internal.DefaultPersistentDirectoryStore.useCache(DefaultPersistentDirectoryStore.java:147)  
> at org.gradle.cache.internal.DefaultCacheFactory$ReferenceTrackingCache.useCache(DefaultCacheFactory.java:185)  
> at org.gradle.initialization.buildsrc.BuildSourceBuilder.buildBuildSrc(BuildSourceBuilder.java:109)  
> at org.gradle.initialization.buildsrc.BuildSourceBuilder.access$000(BuildSourceBuilder.java:46)  
> at org.gradle.initialization.buildsrc.BuildSourceBuilder$3.call(BuildSourceBuilder.java:88)  
> at org.gradle.initialization.buildsrc.BuildSourceBuilder$3.call(BuildSourceBuilder.java:85)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:350)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:340)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:120)  
> at org.gradle.initialization.buildsrc.BuildSourceBuilder.createBuildSourceClasspath(BuildSourceBuilder.java:85)  
> at org.gradle.initialization.buildsrc.BuildSourceBuilder.buildAndCreateClassLoader(BuildSourceBuilder.java:70)  
> at org.gradle.initialization.DefaultSettingsLoader.findSettingsAndLoadIfAppropriate(DefaultSettingsLoader.java:88)  
> at org.gradle.initialization.DefaultSettingsLoader.findAndLoadSettings(DefaultSettingsLoader.java:47)  
> at org.gradle.internal.composite.CompositeBuildSettingsLoader.findAndLoadSettings(CompositeBuildSettingsLoader.java:49)  
> at org.gradle.initialization.NotifyingSettingsLoader.findAndLoadSettings(NotifyingSettingsLoader.java:31)  
> at org.gradle.initialization.DefaultGradleLauncher$LoadBuild.run(DefaultGradleLauncher.java:235)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)  
> at org.gradle.initialization.DefaultGradleLauncher.loadSettings(DefaultGradleLauncher.java:159)  
> at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:122)  
> at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:109)  
> at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:78)  
> at org.gradle.internal.invocation.GradleBuildController$1.call(GradleBuildController.java:75)  
> at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:152)  
> at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:100)  
> at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:75)  
> 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$1.run(RunAsBuildOperationBuildActionRunner.java:43)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)  
> at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)  
> at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:40)  
> at org.gradle.tooling.internal.provider.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:51)  
> at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:47)  
> 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:80)  
> at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:53)  
> at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:57)  
> at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:32)  
> 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:64)  
> at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:29)  
> 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:45)  
> 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:82)  
> 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](https://help.gradle.org)
> 
> BUILD FAILED in 0s