Gradle test fails with error

Question

I see next in my output:

FAILURE: Build failed with an exception.  * What went wrong: Execution failed for task ':test'. > superClassName is empty! 

I appreciate if someone knows how to fix it.

I've already took a look to the http://issues.gradle.org/browse/GRADLE-1682. But any solution didn't help

Created Gist with more information: https://gist.github.com/emartynov/c88194c702b77f42a7c0

Here is stacktrace:

* Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':test'.     at   org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter. java:72)         at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:49 )     at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskEx ecuter.java:34)     at org.gradle.api.internal.changedetection.CacheLockHandlingTaskExecuter$1.run(CacheLockHandlingTaskExecuter.jav a:34)     at org.gradle.internal.Factories$1.create(Factories.java:22)     at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:179)     at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:232)     at org.gradle.cache.internal.DefaultPersistentDirectoryStore.longRunningOperation(DefaultPersistentDirectoryStor e.java:142)     at org.gradle.api.internal.changedetection.DefaultTaskArtifactStateCacheAccess.longRunningOperation(DefaultTaskA rtifactStateCacheAccess.java:83)     at org.gradle.api.internal.changedetection.CacheLockHandlingTaskExecuter.execute(CacheLockHandlingTaskExecuter.j ava:32)     at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:55)     at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:57)     at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExec uter.java:41)     at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.j ava:51)     at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:52)     at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.j ava:42)     at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:275)     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.executeTask(DefaultTaskPlanExecutor.java:52)     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.processTask(DefaultTaskPlanExecutor.java:38)     at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:30)     at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:84)     at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)     at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)     at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)     at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)     at org.gradle.api.internal.changedetection.TaskCacheLockHandlingBuildExecuter$1.run(TaskCacheLockHandlingBuildEx ecuter.java:31)     at org.gradle.internal.Factories$1.create(Factories.java:22)     at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:124)     at org.gradle.cache.internal.DefaultCacheAccess.useCache(DefaultCacheAccess.java:112)     at org.gradle.cache.internal.DefaultPersistentDirectoryStore.useCache(DefaultPersistentDirectoryStore.java:134)     at org.gradle.api.internal.changedetection.DefaultTaskArtifactStateCacheAccess.useCache(DefaultTaskArtifactState CacheAccess.java:79)     at org.gradle.api.internal.changedetection.TaskCacheLockHandlingBuildExecuter.execute(TaskCacheLockHandlingBuild Executer.java:29)     at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)     at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)     at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)     at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)     at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)     at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:54)     at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:165)     at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:113)     at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:81)     at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:38)     at org.gradle.launcher.exec.InProcessGradleLauncherActionExecuter.execute(InProcessGradleLauncherActionExecuter. java:39)     at org.gradle.launcher.exec.InProcessGradleLauncherActionExecuter.execute(InProcessGradleLauncherActionExecuter. java:25)     at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:50)     at org.gradle.api.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)     at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:20 1)     at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:17 4)     at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)     at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)     at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)     at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)     at org.gradle.launcher.Main.doAction(Main.java:48)     at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)     at org.gradle.launcher.Main.main(Main.java:39)     at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)     at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:32)     at org.gradle.launcher.GradleMain.main(GradleMain.java:26) Caused by: java.lang.IllegalArgumentException: superClassName is empty!     at org.gradle.api.internal.tasks.testing.detection.AbstractTestFrameworkDetector.getSuperTestClassFile(AbstractT estFrameworkDetector.java:63)     at org.gradle.api.internal.tasks.testing.junit.JUnitDetector.processTestClass(JUnitDetector.java:51)     at org.gradle.api.internal.tasks.testing.detection.AbstractTestFrameworkDetector.processSuperClass(AbstractTestF rameworkDetector.java:142)     at org.gradle.api.internal.tasks.testing.junit.JUnitDetector.processTestClass(JUnitDetector.java:54)     at org.gradle.api.internal.tasks.testing.detection.AbstractTestFrameworkDetector.processSuperClass(AbstractTestF rameworkDetector.java:142)     at org.gradle.api.internal.tasks.testing.junit.JUnitDetector.processTestClass(JUnitDetector.java:54)     at org.gradle.api.internal.tasks.testing.detection.AbstractTestFrameworkDetector.processTestClass(AbstractTestFr ameworkDetector.java:131)     at org.gradle.api.internal.tasks.testing.detection.DefaultTestClassScanner$1.visitClassFile(DefaultTestClassScan ner.java:58)     at org.gradle.api.internal.tasks.testing.detection.DefaultTestClassScanner$ClassFileVisitor.visitFile(DefaultTes tClassScanner.java:78)     at org.gradle.api.internal.file.collections.DirectoryFileTree.walkDir(DirectoryFileTree.java:156)     at org.gradle.api.internal.file.collections.DirectoryFileTree.walkDir(DirectoryFileTree.java:171)     at org.gradle.api.internal.file.collections.DirectoryFileTree.walkDir(DirectoryFileTree.java:171)     at org.gradle.api.internal.file.collections.DirectoryFileTree.walkDir(DirectoryFileTree.java:171)     at org.gradle.api.internal.file.collections.DirectoryFileTree.visitFrom(DirectoryFileTree.java:124)     at org.gradle.api.internal.file.collections.DirectoryFileTree.visit(DirectoryFileTree.java:114)     at org.gradle.api.internal.file.collections.FileTreeAdapter.visit(FileTreeAdapter.java:96)     at org.gradle.api.internal.file.CompositeFileTree.visit(CompositeFileTree.java:54)     at org.gradle.api.internal.tasks.testing.detection.DefaultTestClassScanner.detectionScan(DefaultTestClassScanner .java:56)     at org.gradle.api.internal.tasks.testing.detection.DefaultTestClassScanner.run(DefaultTestClassScanner.java:50)     at org.gradle.api.internal.tasks.testing.processors.TestMainAction.run(TestMainAction.java:43)     at org.gradle.api.internal.tasks.testing.detection.DefaultTestExecuter.execute(DefaultTestExecuter.java:77)     at org.gradle.api.tasks.testing.Test.executeTests(Test.java:448)     at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:216)     at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:122)     at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:147)     at org.gradle.api.tasks.testing.Test_Decorated.invokeMethod(Unknown Source)     at org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23)     at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$4.execute(AnnotationProcessingTas kFactory.java:161)     at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$4.execute(AnnotationProcessingTas kFactory.java:156)     at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:510)     at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:499)     at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter. java:64)     ... 57 more 

Answer 1

Sounds like GRADLE-1682. Turning off class file scanning should solve the problem:

tasks.withType(Test) {     scanForTestClasses = false     include "**/*Test.class" // whatever Ant pattern matches your test class files }