While using dagger 2 : e: [kapt] An exception occurred: java.lang.IllegalArgumentException: void

Question

I am using dagger2 and after adding some view model injection code, I get this error:

e: [kapt] An exception occurred: java.lang.IllegalArgumentException: void
    at com.sun.tools.javac.model.JavacTypes.getDeclaredType0(JavacTypes.java:252)
    at com.sun.tools.javac.model.JavacTypes.getDeclaredType(JavacTypes.java:222)
    at dagger.internal.codegen.langmodel.DaggerTypes.getDeclaredType(DaggerTypes.java:345)
    at dagger.internal.codegen.BindsTypeChecker.desiredAssignableType(BindsTypeChecker.java:71)
    at dagger.internal.codegen.BindsTypeChecker.isAssignable(BindsTypeChecker.java:56)
    at dagger.internal.codegen.BindsMethodValidator$Validator.checkParameter(BindsMethodValidator.java:92)
    at dagger.internal.codegen.BindingMethodValidator$MethodValidator.checkParameters(BindingMethodValidator.java:209)
    at dagger.internal.codegen.BindsMethodValidator$Validator.checkParameters(BindsMethodValidator.java:77)
    at dagger.internal.codegen.BindingMethodValidator$MethodValidator.checkAdditionalProperties(BindingMethodValidator.java:144)
    at dagger.internal.codegen.BindingElementValidator$ElementValidator.validate(BindingElementValidator.java:145)
    at dagger.internal.codegen.BindingElementValidator$ElementValidator.access$000(BindingElementValidator.java:129)
    at dagger.internal.codegen.BindingElementValidator.validateUncached(BindingElementValidator.java:78)
    at dagger.internal.codegen.Util.reentrantComputeIfAbsent(Util.java:93)
    at dagger.internal.codegen.BindingElementValidator.validate(BindingElementValidator.java:74)
    at dagger.internal.codegen.AnyBindingMethodValidator.validateUncached(AnyBindingMethodValidator.java:99)
    at dagger.internal.codegen.Util.reentrantComputeIfAbsent(Util.java:93)
    at dagger.internal.codegen.AnyBindingMethodValidator.validate(AnyBindingMethodValidator.java:74)
    at dagger.internal.codegen.ModuleValidator.validateUncached(ModuleValidator.java:189)
    at dagger.internal.codegen.ModuleValidator.lambda$validate$0(ModuleValidator.java:169)
    at dagger.internal.codegen.Util.reentrantComputeIfAbsent(Util.java:93)
    at dagger.internal.codegen.ModuleValidator.validate(ModuleValidator.java:169)
    at dagger.internal.codegen.ModuleValidator.validate(ModuleValidator.java:163)
    at dagger.internal.codegen.ModuleProcessingStep.process(ModuleProcessingStep.java:98)
    at dagger.internal.codegen.ModuleProcessingStep.process(ModuleProcessingStep.java:47)
    at dagger.internal.codegen.TypeCheckingProcessingStep.lambda$process$0(TypeCheckingProcessingStep.java:51)
    at com.google.common.collect.RegularImmutableMap.forEach(RegularImmutableMap.java:185)
    at dagger.internal.codegen.TypeCheckingProcessingStep.process(TypeCheckingProcessingStep.java:48)
    at dagger.internal.codegen.ModuleProcessingStep.process(ModuleProcessingStep.java:89)
    at dagger.internal.codegen.ModuleProcessingStep.process(ModuleProcessingStep.java:47)
    at dagger.internal.codegen.DaggerStatisticsCollectingProcessingStep.process(DaggerStatisticsCollectingProcessingStep.java:52)
    at dagger.shaded.auto.common.BasicAnnotationProcessor.process(BasicAnnotationProcessor.java:330)
    at dagger.shaded.auto.common.BasicAnnotationProcessor.process(BasicAnnotationProcessor.java:181)
    at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor.process(incrementalProcessors.kt)
    at org.jetbrains.kotlin.kapt3.base.ProcessorWrapper.process(annotationProcessing.kt:147)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1068)
    at org.jetbrains.kotlin.kapt3.base.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:79)
    at org.jetbrains.kotlin.kapt3.base.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:35)
    at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.runAnnotationProcessing(Kapt3Extension.kt:230)
    at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:188)
    at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:99)
    at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:96)
    at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:106)
    at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:81)
    at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:555)
    at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:82)
    at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:107)
    at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:546)
    at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:177)
    at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:164)
    at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:54)
    at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:84)
    at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:42)
    at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:104)
    at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1558)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:kaptDebugKotlin'.
> Compilation error. See log for more details

I don't know much about it, why this occurred, but also tried some solution and updating versions of kotlin and dagger2 but didn't work.

Let me know if something else is needed to put in the code.

Answer 1

In a problem similar to the one described in @bibangamba 's answer, it can also happen when using dagger.android and not returning the AndroidInjector.Factory<*> type for the injector factory's binding function declaration:

@Module(subcomponents = [
    ChatComponent::class
])
interface ChatModule {
    @Binds
    @IntoMap
    @ClassKey(ChatFragment::class)
    abstract fun bindChatFragmentInjectorFactory(
        factory: ChatComponent.Factory
    ): AndroidInjector.Factory<*>
}

Answer 2

I just suffered through this exact error. Make sure that you're returning a ViewModel from your module function (provides or binds) e.g.

@Binds
@IntoMap
@ViewModelKey(AuthenticationViewModel::class)
abstract fun bindsAuthViewModel(authViewModel: AuthenticationViewModel) :ViewModel

I'm writing kotlin for the first time in a while and I forgot to add the :ViewModel to return the dependency that'll get injected wherever.

Good luck!