Incremental compilation fails when project does not produce jar file

when you configure JavaCompile task to use incremental compilation with

options.incremental = true

then the javaCompile task fails when a project has a dependency to another project which does not produce any jar file (e.g. when you disable it with jar.enabled = false or when the project does not have any sources) with

java.io.FileNotFoundException

Thanks for the report Daniel. I’ve raised as GRADLE-3263.

Do you have a stacktrace handy that I can add to the report?

Sure thing…

FAILURE: Build failed with an exception.
  * What went wrong:
Execution failed for task ':pppppp:compileJava'.
> java.io.FileNotFoundException: /path/to/xxxxxxxxx.jar (No such file or directory)
  * Try:
Run with --info or --debug option to get more log output.
  * Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':pppppp:compileJava'.
 at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
 at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
 at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
 at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
 at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
 at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42)
 at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
 at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
 at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
 at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:306)
 at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79)
 at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63)
 at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51)
 at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23)
 at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:88)
 at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
 at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
 at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
 at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
 at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
 at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
 at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
 at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149)
 at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
 at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
 at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:80)
 at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
 at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
 at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:36)
 at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
 at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:51)
 at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:169)
 at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
 at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
 at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
 at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
 at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
 at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
 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:33)
 at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
 at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
 at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
 at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
 at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
 at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:127)
 at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:55)
Caused by: org.gradle.api.UncheckedIOException: java.io.FileNotFoundException: /path/to/xxxxxxxxx.jar (No such file or directory)
 at org.gradle.internal.hash.HashUtil.createHash(HashUtil.java:39)
 at org.gradle.api.internal.hash.DefaultHasher.hash(DefaultHasher.java:24)
 at org.gradle.api.internal.tasks.compile.incremental.jar.CachingJarSnapshotter.getHash(CachingJarSnapshotter.java:53)
 at org.gradle.api.internal.tasks.compile.incremental.jar.CachingJarSnapshotter.createSnapshot(CachingJarSnapshotter.java:40)
 at org.gradle.api.internal.tasks.compile.incremental.jar.JarClasspathSnapshotFactory.createSnapshot(JarClasspathSnapshotFactory.java:40)
 at org.gradle.api.internal.tasks.compile.incremental.jar.JarClasspathSnapshotMaker.maybeInitialize(JarClasspathSnapshotMaker.java:60)
 at org.gradle.api.internal.tasks.compile.incremental.jar.JarClasspathSnapshotMaker.storeJarSnapshots(JarClasspathSnapshotMaker.java:42)
 at org.gradle.api.internal.tasks.compile.incremental.IncrementalCompilationFinalizer.execute(IncrementalCompilationFinalizer.java:46)
 at org.gradle.api.internal.tasks.compile.incremental.IncrementalCompilationFinalizer.execute(IncrementalCompilationFinalizer.java:24)
 at org.gradle.api.tasks.compile.JavaCompile.performCompilation(JavaCompile.java:156)
 at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:124)
 at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
 at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.doExecute(AnnotationProcessingTaskFactory.java:235)
 at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:211)
 at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$IncrementalTaskAction.execute(AnnotationProcessingTaskFactory.java:222)
 at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:200)
 at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
 at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
 ... 47 more
Caused by: java.io.FileNotFoundException: /path/to/xxxxxxxxx.jar (No such file or directory)
 at org.gradle.internal.hash.HashUtil.createHash(HashUtil.java:34)
 ... 64 more

I have to correct the original report, if you don’t have any sources, but the jar task is enabled, this problem won’t occur.