IssueTracker

Thanks for reporting, would you be able to provide a reproducible case for when this incremental error occurs? The task for merging java resources has multiple incremental inputs depending on where the java resource originates - providing a sample project where this issue can be triggered will help the team narrow what task input is impacted. A longer stacktrace of the issue from #1 might also be useful.

Unfortunately I cannot reproduce it consistently. In fact I don't even know what triggers it (it seems to be some combination of changes).

Like I mentioned above, my hunch is that this is due to having several modules with the same name (impl). The resource in question (impl_debug.kotlin_module) contains the name of the Gradle module and it likely means that there will be conflicts since there are several modules with the same name.

The stack trace looks like this:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:mergeDebugJavaResource'.	
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:149)	
	at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:282)	
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:147)	
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:135)	
	at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)	
	at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)	
	at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)	
	at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)	
	at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)	
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)	
	at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:337)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:324)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:317)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:303)	
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:463)	
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:380)	
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)	
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:49)	
Caused by: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing com.android.build.gradle.internal.tasks.MergeJavaResWorkAction	
	at org.gradle.workers.internal.DefaultWorkerExecutor$WorkItemExecution.waitForCompletion(DefaultWorkerExecutor.java:283)	
	at org.gradle.internal.work.DefaultAsyncWorkTracker.lambda$waitForItemsAndGatherFailures$2(DefaultAsyncWorkTracker.java:130)	
	at org.gradle.internal.Factories$1.create(Factories.java:31)	
	at org.gradle.internal.work.DefaultWorkerLeaseService.withoutLocks(DefaultWorkerLeaseService.java:321)	
	at org.gradle.internal.work.DefaultWorkerLeaseService.withoutLocks(DefaultWorkerLeaseService.java:304)	
	at org.gradle.internal.work.DefaultWorkerLeaseService.withoutLock(DefaultWorkerLeaseService.java:309)	
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForItemsAndGatherFailures(DefaultAsyncWorkTracker.java:126)	
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForItemsAndGatherFailures(DefaultAsyncWorkTracker.java:92)	
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForAll(DefaultAsyncWorkTracker.java:78)	
	at org.gradle.internal.work.DefaultAsyncWorkTracker.waitForCompletion(DefaultAsyncWorkTracker.java:66)	
	at org.gradle.api.internal.tasks.execution.TaskExecution$3.run(TaskExecution.java:250)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:47)	
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:68)	
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeAction(TaskExecution.java:227)	
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeActions(TaskExecution.java:210)	
	at org.gradle.api.internal.tasks.execution.TaskExecution.executeWithPreviousOutputFiles(TaskExecution.java:193)	
	at org.gradle.api.internal.tasks.execution.TaskExecution.execute(TaskExecution.java:166)	
	at org.gradle.internal.execution.steps.ExecuteStep.executeInternal(ExecuteStep.java:105)	
	at org.gradle.internal.execution.steps.ExecuteStep.access$000(ExecuteStep.java:44)	
	at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:59)	
	at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:56)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)	
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)	
	at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:56)	
	at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:44)	
	at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:67)	
	at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:37)	
	at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:41)	
	at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:74)	
	at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:55)	
	at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:50)	
	at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:28)	
	at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.executeDelegateBroadcastingChanges(CaptureStateAfterExecutionStep.java:100)	
	at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:72)	
	at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:50)	
	at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:40)	
	at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:29)	
	at org.gradle.internal.execution.steps.BuildCacheStep.executeWithoutCache(BuildCacheStep.java:166)	
	at org.gradle.internal.execution.steps.BuildCacheStep.lambda$execute$1(BuildCacheStep.java:70)	
	at org.gradle.internal.Either$Right.fold(Either.java:175)	
	at org.gradle.internal.execution.caching.CachingState.fold(CachingState.java:59)	
	at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:68)	
	at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:46)	
	at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:36)	
	at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:25)	
	at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:36)	
	at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:22)	
	at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:91)	
	at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$2(SkipUpToDateStep.java:55)	
	at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55)	
	at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:37)	
	at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:65)	
	at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:36)	
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:37)	
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:27)	
	at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:76)	
	at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:37)	
	at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:94)	
	at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:49)	
	at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:71)	
	at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:45)	
	at org.gradle.internal.execution.steps.SkipEmptyWorkStep.executeWithNonEmptySources(SkipEmptyWorkStep.java:177)	
	at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:81)	
	at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:53)	
	at org.gradle.internal.execution.steps.RemoveUntrackedExecutionStateStep.execute(RemoveUntrackedExecutionStateStep.java:32)	
	at org.gradle.internal.execution.steps.RemoveUntrackedExecutionStateStep.execute(RemoveUntrackedExecutionStateStep.java:21)	
	at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:38)	
	at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:36)	
	at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:23)	
	at org.gradle.internal.execution.steps.CleanupStaleOutputsStep.execute(CleanupStaleOutputsStep.java:75)	
	at org.gradle.internal.execution.steps.CleanupStaleOutputsStep.execute(CleanupStaleOutputsStep.java:41)	
	at org.gradle.internal.execution.steps.AssignWorkspaceStep.lambda$execute$0(AssignWorkspaceStep.java:32)	
	at org.gradle.api.internal.tasks.execution.TaskExecution$4.withWorkspace(TaskExecution.java:287)	
	at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:30)	
	at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:21)	
	at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:37)	
	at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:27)	
	at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:47)	
	at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:34)	
	at org.gradle.internal.execution.impl.DefaultExecutionEngine$1.execute(DefaultExecutionEngine.java:64)	
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:146)	
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:135)	
	at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)	
	at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)	
	at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)	
	at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)	
	at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)	
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)	
	at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)	
	at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:337)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:324)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:317)	
	at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:303)	
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:463)	
	at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:380)	
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)	
	at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:49)	
Caused by: java.lang.IllegalStateException: Unexpected combination of states CHANGED, REMOVED for file /path/to/module/build/intermediates/java_res/debug/out/META-INF/impl_debug.kotlin_module	
	at com.android.build.gradle.internal.tasks.IncrementalFileMergerTaskUtils.collectChanges(IncrementalFileMergerTaskUtils.kt:275)	
	at com.android.build.gradle.internal.tasks.IncrementalFileMergerTaskUtils.toInputs(IncrementalFileMergerTaskUtils.kt:229)	
	at com.android.build.gradle.internal.tasks.MergeJavaResWorkAction.run(MergeJavaResWorkAction.kt:68)	
	at com.android.build.gradle.internal.profile.ProfileAwareWorkAction.execute(ProfileAwareWorkAction.kt:74)	
	at org.gradle.workers.internal.DefaultWorkerServer.execute(DefaultWorkerServer.java:63)	
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:66)	
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1$1.create(NoIsolationWorkerFactory.java:62)	
	at org.gradle.internal.classloader.ClassLoaderUtils.executeInClassloader(ClassLoaderUtils.java:100)	
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.lambda$execute$0(NoIsolationWorkerFactory.java:62)	
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:44)	
	at org.gradle.workers.internal.AbstractWorker$1.call(AbstractWorker.java:41)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)	
	at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)	
	at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)	
	at org.gradle.workers.internal.AbstractWorker.executeWrappedInBuildOperation(AbstractWorker.java:41)	
	at org.gradle.workers.internal.NoIsolationWorkerFactory$1.execute(NoIsolationWorkerFactory.java:59)	
	at org.gradle.workers.internal.DefaultWorkerExecutor.lambda$submitWork$0(DefaultWorkerExecutor.java:169)	
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runExecution(DefaultConditionalExecutionQueue.java:187)	
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.access$700(DefaultConditionalExecutionQueue.java:120)	
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner$1.run(DefaultConditionalExecutionQueue.java:162)	
	at org.gradle.internal.Factories$1.create(Factories.java:31)	
	at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:249)	
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:109)	
	at org.gradle.internal.work.DefaultWorkerLeaseService.runAsWorkerThread(DefaultWorkerLeaseService.java:114)	
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.runBatch(DefaultConditionalExecutionQueue.java:157)	
	at org.gradle.internal.work.DefaultConditionalExecutionQueue$ExecutionRunner.run(DefaultConditionalExecutionQueue.java:126)	
	... 2 more

Thanks for the additional information. I have refactored the Java Resource merging incremental handling to better handle source file path roots - so hopefully this is enough to eliminate the possibility of collisions between java resources. However, it would be great to test these changes resolve your issue. My current assumption is that the issue occurs when there is a library structure where there are two modules of the same name nested within two differently named modules such as:

app
foo_lib
  foo
bar_lib
  foo

Could you confirm that this setup is similar in your project or if not, can you please provide your project structure or even a project if possible?

Yes, our setup looks like this:

:features
  :feature1
    :public
    :impl
  :feature2
    :public
    :impl
...

The modules mentioned in the error would always be one of these impl or public modules.

Unfortunately I cannot share our project and even if I could, I don't know how to replicate the issue.

I will say though that since upgrading to the latest AGP 8.2 alpha I have not seen the issue so it's possible that it's already been fixed as a part of another change.

Oops, spoke too soon. It just happened.

Once it happens ever run will trigger it so if you need me to log or try something let me know. Removing the app level build directory fixes the issue.

BTW, what is the target release for this fix?

For now, we've worked around this by adding this to our Kotlin convention plugin:

tasks.withType<KotlinCompile>().configureEach {
    compilerOptions {
        moduleName.set(path.removePrefix(":").replace(":", "_"))
    }
}

Thanks for sharing the workaround. I needed to slightly adapt it to work for us, otherwise kapt and ksp would fail because they'd expect different names for internal symbols.

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompilationTask.class).configureEach {
    if (!name.containsIgnoreCase("ksp") && !name.containsIgnoreCase("kapt")) {
       compilerOptions {
       moduleName.set(path.substring(1).replace(":", "_"))
    }
}

Actually, I found a better way to solve this. The default module name is based on the base plugin's archivesName property. So you can do this instead:

base {
    archivesName.set(path.removePrefix(":").replace(":", "_"))
}

It seems AGP is not correctly excluding kotlin_module files during java resource merging, so we'd expect a collision - although this error message isn't clear.

Until we release we have a fix for the issue, a workaround may be to add packagingOptions { exclude 'META-INF/*.kotlin_module' } to the build.gradle conflicting libraries, so AGP doesn't attempt to merge them.

Alternatively you can give them unique names e.g.

kotlin {
    compilerOptions {
        moduleName.set(project.path)
    }
}

applied to all projects

We set the module to the dashified project gradle path. Kinda feel like this should be the default for the module merging issue in general

In my case, I had similar errors with MergeJavaResourcesTask
But in my case, errors were against for META-INF metadata from Google AutoService instead of kotlin-module

And I did set same workaround with Comment #8, then errors were gone.

I also had an error from Google AutoService and packagingOptions { exclude 'META-INF/*.kotlin_module' } removes the error in next build but it does not look correct solution. Can someone help me to fix this issue. For my case the error is for some debug source code which we generate using Google AutoService. Should I exclude those files or use pickFirst for them?

I have same issue again after Comment #14
I'm not sure, but I'm guessing that error was raised again after applied AGP 8.2

In my case, module A and module B have implementations of interface Xxx which can be loaded by AutoService.

and MergeJavaResourcesTask was failed of app C while merge META-INF/services/Xxx from module A and module B

I had previously applied the workaround from #10 to our build, however it caused packaging issues that manifested as runtime crashes. I'll be taking a second look at the workaround to see if I can fix our previous issues with it since we are starting to see this problem happen a lot more frequently. An issue with Anvil has been causing our developers to use --rerun and --rerun-tasks more frequently than usual, which masks the issue here. With the latest beta release of anvil, those options are no longer needed and this bug pops up a lot more frequently. We are using AGP 8.2.2 currently

With the latest beta release of anvil, those options are no longer needed and this bug pops up a lot more frequently.

It doesn't seem like the latest beta has resolved these issues :/ https://github.com/square/anvil/issues/876

Have been having the same issue in recent builds, rm -rf app/build is what helped in my case.

I've managed to get what looks like a reliable reproduction case for this.

This is mitigated in 22ea772c902a9891a6023ed1ebdc832871775ba6 but I am suspicious there are other lurking issues by inspection and from #comment19

Filed issue 327603250 to follow up, marking this as closed as the initial issue should no longer directly bite.

Thank you for your patience while our engineering team worked to resolve this issue. A fix for this issue is now available in:

• Android Studio Jellyfish | 2023.3.1 Canary 12
• Android Gradle Plugin 8.4.0-alpha12

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.

Thank you for taking the time to submit feedback — we really appreciate it!

AGP 8.3 final version was released at today.
Could this fix be applied to AGP 8.3.x patch version?
Or is there another solution that can alleviate this issue?

Re #comment19 - are you using merge or pickFirst in packagingOptions?

No, we have some exclude rules but don't use either merge or pickFirst

The fixes for this issue are now also available in:

• Android Studio Iguana | 2023.2.1 Patch 1
• Android Gradle Plugin 8.3.1

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.

Ben, can you check if updating to 8.3.28 resolves the issue?

You may still see a small regression, since https://r8.googlesource.com/r8/+/e98da634de940e3d0098e0467d08af80c532139d is fixing a situation where R8 would not always evaluate -if rules correctly, but hopefully not anywhere near the regression you reported here.

With R8 8.3.28, we observe app size reduced by 90KB.

Btw, Soren when I replaced our Gson rules with the rules from upstream, our app size increases by 600KB.

Here are the rules we are using for GSON:

##---------------Begin: proguard configuration for Gson  ----------
# Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
-keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

# Prevent proguard from stripping interface information from TypeAdapterFactory,
# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
-keep,allowobfuscation class * implements com.google.gson.TypeAdapterFactory
-keep,allowobfuscation class * implements com.google.gson.JsonSerializer
-keep,allowobfuscation class * implements com.google.gson.JsonDeserializer

# @SerializedName annotation
-keep @interface com.google.gson.annotations.SerializedName { *; }

# Do not strip any field that is annotated with @SerializedName
-keepclassmembers,allowobfuscation class * {
    @com.google.gson.annotations.SerializedName <fields>;
}

# Ensure init methods are preserved if class has @SerializedName annotations
# Ref: https://partnerissuetracker.corp.google.com/issues/280658459#comment4
-if class * {
  @com.google.gson.annotations.SerializedName <fields>;
}
-keepclasseswithmembers,allowobfuscation class <1> {
  <init>(...);
}
-if class *
-keepclasseswithmembers,allowshrinking,allowobfuscation class <1> {
  @com.google.gson.annotations.SerializedName <fields>;
}

##---------------End: proguard configuration for Gson  ----------

Note, when doing this comparison I didn't switch the <init>(...) with <init>() yet.

Thanks for the update. I will mark this as fixed then.

Thank you for your patience while our engineering team worked to resolve this issue. A fix for this issue is now available in:

• Android Studio Iguana | 2023.2.1 Beta 2
• Android Gradle Plugin 8.3.0-beta02

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.

Thank you for taking the time to submit feedback — we really appreciate it!

The fixes for this issue are now also available in:

• Android Studio Hedgehog | 2023.1.1 Patch 2
• Android Gradle Plugin 8.2.2

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.

Comment added by automation: A postmortem has been automatically requested for this issue. Please author a postmortem on IRM. See go/android-postmortem-guidance for more context and details, including how to handle the case when this issue does not need a postmortem. If you have any questions not answered by go/android-postmortem-guidance, please email android-hygiene-tpm@, instead of reassigning the fixed bug. Thank you.

Further fixes for this issue are now available in:

• Android Studio Iguana | 2023.2.1 RC 1
• Android Gradle Plugin 8.3.0-rc01

We encourage you to try the latest update.

If you notice further issues or have questions, please file a new bug report.