Proto DataStore interop #1341

charlie-niekirk · 2025-11-07T16:39:28Z

charlie-niekirk
Nov 7, 2025

I've created a datastore module in my application and am trying to use Metro to provide the DataStore<T> dependency and am struggling a bit.

Here's my BindingContainer that provides the DataStore dependencies:

private const val DATASTORE_FILE_NAME = "recent_searches.proto"

@BindingContainer
object DatastoreProviders {

    @Provides
    @SingleIn(AppScope::class)
    fun provideRecentSearchesDatastore(@ApplicationContext context: Context): DataStore<RecentSearches> {
        return DataStoreFactory.create(
            serializer = RecentSearchesSerializer,
            produceFile = { context.dataStoreFile(DATASTORE_FILE_NAME) },
            corruptionHandler = null,
            scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
        )
    }

    @Provides
    @SingleIn(AppScope::class)
    fun provideRecentSearchesDataSource(dataStore: DataStore<RecentSearches>): RecentSearchesDataSource =
        RecentSearchesDataSource(dataStore)
}

Here's how I'm using it in the app module:

@DependencyGraph(
    scope = AppScope::class,
    bindingContainers = [
        NetworkProviders::class,
        DatabaseProviders::class,
        DatastoreProviders::class,
        PlatformProviders::class,
    ]
)
interface OnTrackGraph : ViewModelGraph.Factory, DataProviders {

    @Provides
    @ApplicationContext
    fun provideApplicationContext(application: Application): Context = application

    @Multibinds
    val activityProviders: Map<KClass<out Activity>, Provider<Activity>>

    @DependencyGraph.Factory
    fun interface Factory {
        fun create(@Provides application: Application): OnTrackGraph
    }
}

When I build my project I am getting this (not massively intuitive) error:

java.lang.AssertionError: Code gen exception while processing me/cniekirk/ontrack/di/OnTrackGraph. class org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl cannot be cast to class org.jetbrains.kotlin.ir.types.IrSimpleType (org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl and org.jetbrains.kotlin.ir.types.IrSimpleType are in unnamed module of loader 'app')
Caused by: java.lang.ClassCastException: class org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl cannot be cast to class org.jetbrains.kotlin.ir.types.IrSimpleType (org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl and org.jetbrains.kotlin.ir.types.IrSimpleType are in unnamed module of loader 'app')
	at org.jetbrains.kotlin.ir.types.IrTypeSystemContext$DefaultImpls.withNullability(IrTypeSystemContext.kt:85)
	at org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl.withNullability(IrTypeSystemContext.kt:621)
	at org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl.withNullability(IrTypeSystemContext.kt:621)
	at org.jetbrains.kotlin.types.model.TypeSystemContextContextualKt.withNullability(TypeSystemContextContextual.kt:101)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.checkSubtypeForSpecialCases(AbstractTypeChecker.kt:585)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.completeIsSubTypeOf(AbstractTypeChecker.kt:321)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.isSubtypeOf(AbstractTypeChecker.kt:277)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.isSubtypeOf$default(AbstractTypeChecker.kt:265)

Could it be due to the fact that the Metro compiler can't see the generated type? I'd appreciate any help, thanks!

ZacSweers · 2025-11-07T19:03:15Z

ZacSweers
Nov 7, 2025
Maintainer

Can you paste the full trace? It's currently cut off before any metro sources. IrErrorTypeImpl usually does come up for types that are not visible to the compiler, yeah

1 reply

charlie-niekirk Nov 9, 2025
Author

Yep sure, sorry about that:

Full stacktrace

e: java.lang.AssertionError: Code gen exception while processing me/cniekirk/ontrack/di/OnTrackGraph. class org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl cannot be cast to class org.jetbrains.kotlin.ir.types.IrSimpleType (org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl and org.jetbrains.kotlin.ir.types.IrSimpleType are in unnamed module of loader 'app')
Caused by: java.lang.ClassCastException: class org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl cannot be cast to class org.jetbrains.kotlin.ir.types.IrSimpleType (org.jetbrains.kotlin.ir.types.impl.IrErrorTypeImpl and org.jetbrains.kotlin.ir.types.IrSimpleType are in unnamed module of loader 'app')
	at org.jetbrains.kotlin.ir.types.IrTypeSystemContext$DefaultImpls.withNullability(IrTypeSystemContext.kt:85)
	at org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl.withNullability(IrTypeSystemContext.kt:621)
	at org.jetbrains.kotlin.ir.types.IrTypeSystemContextImpl.withNullability(IrTypeSystemContext.kt:621)
	at org.jetbrains.kotlin.types.model.TypeSystemContextContextualKt.withNullability(TypeSystemContextContextual.kt:101)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.checkSubtypeForSpecialCases(AbstractTypeChecker.kt:585)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.completeIsSubTypeOf(AbstractTypeChecker.kt:321)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.isSubtypeOf(AbstractTypeChecker.kt:277)
	at org.jetbrains.kotlin.types.AbstractTypeChecker.isSubtypeOf$default(AbstractTypeChecker.kt:265)
	at org.jetbrains.kotlin.ir.util.IrTypeUtilsKt.isSubtypeOf(IrTypeUtils.kt:151)
	at dev.zacsweers.metro.compiler.ir.graph.IrBindingGraph.findSimilarBindings(IrBindingGraph.kt:502)
	at dev.zacsweers.metro.compiler.ir.graph.IrBindingGraph.realGraph$lambda$2(IrBindingGraph.kt:92)
	at dev.zacsweers.metro.compiler.graph.MutableBindingGraph.reportMissingBinding(BindingGraph.kt:457)
	at dev.zacsweers.metro.compiler.graph.MutableBindingGraph.reportMissingBinding$default(BindingGraph.kt:444)
	at dev.zacsweers.metro.compiler.graph.MutableBindingGraph.seal$lambda$3$1(BindingGraph.kt:150)
	at dev.zacsweers.metro.compiler.graph.TopologicalSortKt.buildFullAdjacency(topologicalSort.kt:93)
	at dev.zacsweers.metro.compiler.graph.TopologicalSortKt.buildFullAdjacency(topologicalSort.kt:113)
	at dev.zacsweers.metro.compiler.graph.MutableBindingGraph.seal(BindingGraph.kt:136)
	at dev.zacsweers.metro.compiler.ir.graph.IrBindingGraph.seal(IrBindingGraph.kt:240)
	at dev.zacsweers.metro.compiler.ir.transformers.DependencyGraphTransformer.transformDependencyGraph(DependencyGraphTransformer.kt:445)
	at dev.zacsweers.metro.compiler.ir.transformers.DependencyGraphTransformer.processDependencyGraph$compiler(DependencyGraphTransformer.kt:231)
	at dev.zacsweers.metro.compiler.ir.transformers.DependencyGraphTransformer.tryProcessDependencyGraph(DependencyGraphTransformer.kt:201)
	at dev.zacsweers.metro.compiler.ir.transformers.DependencyGraphTransformer.visitClassNew(DependencyGraphTransformer.kt:178)
	at org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext.visitClass(IrElementTransformerVoidWithContext.kt:62)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitClass(IrElementTransformerVoid.kt:57)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitClass(IrElementTransformerVoid.kt:19)
	at org.jetbrains.kotlin.ir.declarations.IrClass.accept(IrClass.kt:72)
	at org.jetbrains.kotlin.ir.IrElementBase.transform(IrElementBase.kt:33)
	at org.jetbrains.kotlin.ir.util.TransformKt.transformInPlace(transform.kt:35)
	at org.jetbrains.kotlin.ir.declarations.IrPackageFragment.transformChildren(IrPackageFragment.kt:31)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitPackageFragment(IrElementTransformerVoid.kt:146)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitFile(IrElementTransformerVoid.kt:160)
	at org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext.visitFileNew(IrElementTransformerVoidWithContext.kt:122)
	at org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext.visitFile(IrElementTransformerVoidWithContext.kt:55)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitFile(IrElementTransformerVoid.kt:163)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitFile(IrElementTransformerVoid.kt:19)
	at org.jetbrains.kotlin.ir.declarations.IrFile.accept(IrFile.kt:27)
	at org.jetbrains.kotlin.ir.declarations.IrFile.transform(IrFile.kt:30)
	at org.jetbrains.kotlin.ir.declarations.IrFile.transform(IrFile.kt:19)
	at org.jetbrains.kotlin.ir.util.TransformKt.transformInPlace(transform.kt:35)
	at org.jetbrains.kotlin.ir.declarations.IrModuleFragment.transformChildren(IrModuleFragment.kt:46)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitModuleFragment(IrElementTransformerVoid.kt:102)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitModuleFragment(IrElementTransformerVoid.kt:107)
	at org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid.visitModuleFragment(IrElementTransformerVoid.kt:19)
	at org.jetbrains.kotlin.ir.declarations.IrModuleFragment.accept(IrModuleFragment.kt:36)
	at org.jetbrains.kotlin.ir.declarations.IrModuleFragment.transform(IrModuleFragment.kt:39)
	at dev.zacsweers.metro.compiler.ir.MetroIrGenerationExtension.generateInner(MetroIrGenerationExtension.kt:70)
	at dev.zacsweers.metro.compiler.ir.MetroIrGenerationExtension.generate(MetroIrGenerationExtension.kt:44)
	at org.jetbrains.kotlin.fir.pipeline.ConvertToIrKt.applyIrGenerationExtensions(convertToIr.kt:498)
	at org.jetbrains.kotlin.fir.pipeline.Fir2IrPipeline.runActualizationPipeline(convertToIr.kt:253)
	at org.jetbrains.kotlin.fir.pipeline.Fir2IrPipeline.convertToIrAndActualize(convertToIr.kt:134)
	at org.jetbrains.kotlin.fir.pipeline.ConvertToIrKt.convertToIrAndActualize(convertToIr.kt:100)
	at org.jetbrains.kotlin.fir.pipeline.ConvertToIrKt.convertToIrAndActualize$default(convertToIr.kt:73)
	at org.jetbrains.kotlin.cli.jvm.compiler.legacy.pipeline.JvmCompilerPipelineKt.convertToIrAndActualizeForJvm(jvmCompilerPipeline.kt:101)
	at org.jetbrains.kotlin.cli.pipeline.jvm.JvmFir2IrPipelinePhase.executePhase(JvmFir2IrPipelinePhase.kt:30)
	at org.jetbrains.kotlin.cli.pipeline.jvm.JvmFir2IrPipelinePhase.executePhase(JvmFir2IrPipelinePhase.kt:25)
	at org.jetbrains.kotlin.cli.pipeline.jvm.JvmFir2IrPipelinePhase.executePhase(JvmFir2IrPipelinePhase.kt:19)
	at org.jetbrains.kotlin.cli.pipeline.PipelinePhase.phaseBody(PipelinePhase.kt:68)
	at org.jetbrains.kotlin.cli.pipeline.PipelinePhase.phaseBody(PipelinePhase.kt:58)
	at org.jetbrains.kotlin.config.phaser.NamedCompilerPhase.invoke(CompilerPhase.kt:102)
	at org.jetbrains.kotlin.backend.common.phaser.CompositePhase.invoke(PhaseBuilders.kt:22)
	at org.jetbrains.kotlin.config.phaser.CompilerPhaseKt.invokeToplevel(CompilerPhase.kt:53)
	at org.jetbrains.kotlin.cli.pipeline.AbstractCliPipeline.runPhasedPipeline(AbstractCliPipeline.kt:109)
	at org.jetbrains.kotlin.cli.pipeline.AbstractCliPipeline.execute(AbstractCliPipeline.kt:68)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecutePhased(K2JVMCompiler.kt:79)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecutePhased(K2JVMCompiler.kt:45)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:90)
	at org.jetbrains.kotlin.cli.common.CLICompiler.exec(CLICompiler.kt:352)
	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunnerBase.runCompiler(IncrementalJvmCompilerRunnerBase.kt:176)
	at org.jetbrains.kotlin.incremental.IncrementalJvmCompilerRunnerBase.runCompiler(IncrementalJvmCompilerRunnerBase.kt:39)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.doCompile(IncrementalCompilerRunner.kt:499)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileImpl(IncrementalCompilerRunner.kt:416)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compileNonIncrementally(IncrementalCompilerRunner.kt:301)
	at org.jetbrains.kotlin.incremental.IncrementalCompilerRunner.compile(IncrementalCompilerRunner.kt:128)
	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.execIncrementalCompiler(CompileServiceImpl.kt:684)
	at org.jetbrains.kotlin.daemon.CompileServiceImplBase.access$execIncrementalCompiler(CompileServiceImpl.kt:94)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1810)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
	at java.rmi/sun.rmi.transport.Transport$1.run(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Unknown Source)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
	at java.base/java.security.AccessController.doPrivileged(Unknown Source)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

easyhooon · 2025-11-20T04:24:56Z

easyhooon
Nov 20, 2025

Seems similar to this issue. #1358

1 reply

ZacSweers Nov 20, 2025
Maintainer

Likely same type of issue #1358 (reply in thread)

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ZacSweers Nov 7, 2025 Maintainer

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charlie-niekirk Nov 9, 2025 Author

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Nov 7, 2025
Maintainer

charlie-niekirk Nov 9, 2025
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easyhooon
Nov 20, 2025

ZacSweers Nov 20, 2025
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