由于 Hilt 错误，应用程序未初始化

Question

I am trying to start a small project, following clean architecture, MVVM and using Retrofit, coroutines and whatnot. I am using Hilt for DI, and followed pretty much what I saw on the docs and other projects.

If I annotate either my Activity or my Fragment with @AndroidEntryPoint or the Application with @HiltAndroidApp, the app cannot even start. The stack trace is not saying a lot to me, but maybe I'm skipping something. If I don't annotate the classes, the app tries to start, but since it cannot inject the ViewModel from anywhere, it obviously crashes.

Cause: com.example.searchspotify.presentation.view.activity.Hilt_MainActivity

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformClassesWithAndroidEntryPointTransformForDebug'.
> javassist.NotFoundException: com.example.searchspotify.presentation.view.activity.Hilt_MainActivity

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:transformClassesWithAndroidEntryPointTransformForDebug'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:205)
    at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:263)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:203)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:184)
    at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:109)
    at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:62)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:56)
    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$1.call(EventFiringTaskExecuter.java:52)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
    at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
    at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:41)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:372)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:359)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:352)
    at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:338)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.lambda$run$0(DefaultPlanExecutor.java:127)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:191)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.executeNextNode(DefaultPlanExecutor.java:182)
    at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:124)
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
    at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:48)
    at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:56)
Caused by: java.lang.RuntimeException: javassist.NotFoundException: com.example.searchspotify.Hilt_SearchSpotifyApp
    at com.android.builder.profile.Recorder$Block.handleException(Recorder.java:55)
    at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:108)
    at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:242)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:104)
    at org.gradle.api.internal.project.taskfactory.IncrementalTaskInputsTaskAction.doExecute(IncrementalTaskInputsTaskAction.java:47)
    at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:42)
    at org.gradle.api.internal.project.taskfactory.AbstractIncrementalTaskAction.execute(AbstractIncrementalTaskAction.java:25)
    at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:28)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.run(ExecuteActionsTaskExecuter.java:568)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
    at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
    at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:553)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:536)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.access$300(ExecuteActionsTaskExecuter.java:109)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.executeWithPreviousOutputFiles(ExecuteActionsTaskExecuter.java:276)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$TaskExecution.execute(ExecuteActionsTaskExecuter.java:265)
    at org.gradle.internal.execution.steps.ExecuteStep.lambda$execute$0(ExecuteStep.java:32)
    at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:32)
    at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:26)
    at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:63)
    at org.gradle.internal.execution.steps.CleanupOutputsStep.execute(CleanupOutputsStep.java:35)
    at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:49)
    at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:34)
    at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:43)
    at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:73)
    at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:54)
    at org.gradle.internal.execution.steps.CatchExceptionStep.execute(CatchExceptionStep.java:34)
    at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:44)
    at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:54)
    at org.gradle.internal.execution.steps.SnapshotOutputsStep.execute(SnapshotOutputsStep.java:38)
    at org.gradle.internal.execution.steps.BroadcastChangingOutputsStep.execute(BroadcastChangingOutputsStep.java:49)
    at org.gradle.internal.execution.steps.CacheStep.executeWithoutCache(CacheStep.java:153)
    at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:67)
    at org.gradle.internal.execution.steps.CacheStep.execute(CacheStep.java:41)
    at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:44)
    at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:33)
    at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:38)
    at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:24)
    at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:92)
    at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$0(SkipUpToDateStep.java:85)
    at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55)
    at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:39)
    at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:76)
    at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:37)
    at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:36)
    at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:26)
    at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:94)
    at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:49)
    at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:79)
    at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:53)
    at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:74)
    at org.gradle.internal.execution.steps.SkipEmptyWorkStep.lambda$execute$2(SkipEmptyWorkStep.java:78)
    at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:78)
    at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:34)
    at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:39)
    at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:40)
    at org.gradle.internal.execution.steps.LoadExecutionStateStep.execute(LoadExecutionStateStep.java:28)
    at org.gradle.internal.execution.impl.DefaultWorkExecutor.execute(DefaultWorkExecutor.java:33)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:192)
    ... 30 more
Caused by: javassist.NotFoundException: com.example.searchspotify.Hilt_SearchSpotifyApp
    at javassist.ClassPool.get(ClassPool.java:430)
    at dagger.hilt.android.plugin.AndroidEntryPointClassTransformer.transformClass(AndroidEntryPointClassTransformer.kt:126)
    at dagger.hilt.android.plugin.AndroidEntryPointClassTransformer.transformClassToOutput(AndroidEntryPointClassTransformer.kt:105)
    at dagger.hilt.android.plugin.AndroidEntryPointClassTransformer.transformFile(AndroidEntryPointClassTransformer.kt:101)
    at dagger.hilt.android.plugin.AndroidEntryPointTransform.transformFile(AndroidEntryPointTransform.kt:156)
    at dagger.hilt.android.plugin.AndroidEntryPointTransform.transform(AndroidEntryPointTransform.kt:124)
    at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:284)
    at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:247)
    at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:106)
    ... 92 more

I'm leaving here part of my code, if I should provide anything else, let me know, it's pretty basic as of now.

Application

@HiltAndroidApp
class SearchSpotifyApp: Application(){

}

Activity

@AndroidEntryPoint
class MainActivity: AppCompatActivity(){

    private var binding: ActivityMainBinding? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = DataBindingUtil.setContentView(
            this,
            R.layout.activity_main
        )
    }

    override fun onDestroy() {
        binding = null
        super.onDestroy()
    }

}

Fragment

@AndroidEntryPoint
class SearchFragment : Fragment() {

    private lateinit var binding: FragmentSearchBinding
    private val searchViewModel: SearchViewModel by viewModels()

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = FragmentSearchBinding.inflate(inflater)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        initViews()
    }

    private fun initViews() {
        searchViewModel.getSongs().observe(viewLifecycleOwner, {
            binding.text.text = it.first().title
        })
    }
}

Module

private const val BASE_URL = "http://google.es"

@Module
@InstallIn(ApplicationComponent::class)
object AppModule {

    @Singleton
    @Provides
    fun provideRetrofit(gson: Gson): Retrofit = Retrofit.Builder()
        .baseUrl(BASE_URL)
        .addConverterFactory(GsonConverterFactory.create(gson))
        .build()

    @Provides
    fun provideGson(): Gson = GsonBuilder().create()

    @Provides
    fun provideSearchDataSource(retrofit: Retrofit): SearchDataSource =
        retrofit.create(SearchDataSource::class.java)

    @Singleton
    @Provides
    fun provideSearchRepository(searchDataSource: SearchDataSource) =
        SearchRepositoryImpl(searchDataSource)

    @Provides
    fun provideSearchViewModel(repository: SearchRepository) =
        SearchViewModel(repository)
}

I'm pretty sure I'm missing something really basic that I'm not seeing, because I'm not familiar with setting up DI frameworks. Thanks a lot in advance.

Update: Adding the Manifest just in case. Manifest

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.searchspotify">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:name=".SearchSpotifyApp"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity
            android:screenOrientation="portrait"
            android:name=".presentation.view.activity.MainActivity"
            android:theme="@style/AppTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>

</manifest>

Answer 1

In my case I forgot that I am using Kotlin and used annotationProcessor. I changed back to kapt and no more error.

Answer 2

Add this below in your AndroidManifest.xml file

<application    
     android:name=".SearchSpotifyApp"
</application>

Answer 3

Here's the mistake in your code.

@Provides
fun provideSearchViewModel(repository: SearchRepository) = SearchViewModel(repository)

To inject the ViewModel , you have to use @ViewModelInject annotation from androidx.hilt.lifecycle.ViewModelInject package. So your viewModel code should look something like this

import androidx.hilt.lifecycle.ViewModelInject

class SearchViewModel @ViewModelInject constructor(
    private val searchRepo: SearchRepository
) : ViewModel() {

}

You can find the docs here , and here's an example I've created.