Hilt Worker Inject throws NoSuchMethodException

Currently using com.google.dagger:hilt-android:2.37, compiler is com.google.dagger:hilt-android-compiler:2.37, noticing issue after upgrading from 2.33. This error occurs when a repository or another dependency injected component, is injected into the worker, it works fine without the repository injected. This previously worked on v2.33 and I don’t see any breaking changes in the changelog.

Error message:

E/WM-WorkerFactory: Could not instantiate com.testapp.TestApp.services.workers.TestWorker
    java.lang.NoSuchMethodException: com.testapp.TestApp.services.workers.TestWorker.<init> [class android.content.Context, class androidx.work.WorkerParameters]
        at java.lang.Class.getConstructor0(Class.java:2332)
        at java.lang.Class.getDeclaredConstructor(Class.java:2170)
        at androidx.work.WorkerFactory.createWorkerWithDefaultFallback(WorkerFactory.java:95)
        at androidx.work.impl.WorkerWrapper.runWorker(WorkerWrapper.java:244)
        at androidx.work.impl.WorkerWrapper.run(WorkerWrapper.java:136)
        at androidx.work.impl.utils.SerialExecutor$Task.run(SerialExecutor.java:91)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
        at java.lang.Thread.run(Thread.java:923)
2021-06-14 20:04:16.894 5119-5335/com.testapp.TestApp E/WM-WorkerWrapper: Could not create Worker com.testapp.TestApp.services.workers.TestWorker

Worker code example:

@HiltWorker
class TestWorker @AssistedInject constructor(
    @Assisted appContext: Context,
    @Assisted workerParams: WorkerParameters,
    val repository: TestRepository
) : CoroutineWorker(appContext, workerParams) {

    override suspend fun doWork(): Result = withContext(Dispatchers.IO){
        // Indicate whether the work finished successfully with the Result
        return@withContext try{
            Result.success()
        } catch (e: Exception) {
            Result.retry()
        }
    }

Default initializer removed

<provider
            android:name="androidx.startup.InitializationProvider"
            android:authorities="${applicationId}.androidx-startup"
            android:exported="false"
            tools:node="merge">
            <!-- If you are using androidx.startup to initialize other components -->
            <meta-data
                android:name="androidx.work.impl.WorkManagerInitializer"
                android:value="androidx.startup"
                tools:node="remove" />
        </provider>

Application file

@HiltAndroidApp
class App : Application(), Configuration.Provider {

    @Inject
    lateinit var workerFactory: HiltWorkerFactory

    /**
     * Work Manager Configuration
     */
    override fun getWorkManagerConfiguration(): Configuration {
        return Configuration.Builder()
            .setWorkerFactory(workerFactory)
            .setMinimumLoggingLevel(android.util.Log.DEBUG)
            .build()
    }
}

Repository injection

@Module
@InstallIn(SingletonComponent::class)
object RepositoryModule {

    @Provides
    @Singleton
    fun provideTestRepository(
        testDao: TestDao,
        api: Api,
        appExecutors: AppExecutors
    ): TestRepository {
        return TestRepository(testDao, api, appExecutors)
    }
}

Viewmodel code to call worker request

val workRequest = PeriodicWorkRequestBuilder<TestWorker>(15, TimeUnit.MINUTES)
                            .setInitialDelay(1, TimeUnit.MINUTES)
                            .setConstraints(constraints)
                            .build()

                        WorkManager.getInstance(requireContext()).enqueueUniquePeriodicWork(Constants.Worker.WORKER, ExistingPeriodicWorkPolicy.REPLACE, workRequest )

[danysantiago]

Ah - I think this is a bit lost in the release notes, but WorkManagerInitializer got moved in alpha02 and onward, and based on the code that you have you are still removing the one in the outdated package, androidx.work.impl.WorkManagerInitializer vs androidx.work.WorkManagerInitializer.

The full code to only remove WorkManager’s initializer (without disabling all of androidx.startup) should be:

<provider
    android:name="androidx.startup.InitializationProvider"
    android:authorities=\"${applicationId}.androidx-startup"
    android:exported="false"
    tools:node="merge">
    <!-- If you are using androidx.startup to initialize other components -->
    <meta-data
        android:name="androidx.work.WorkManagerInitializer"
        android:value="androidx.startup"
        tools:node="remove" />
 </provider>

[vincent-paing]

I’m on work manager 2.7.1 and hilt 2.41. Seeing this issue. The only workaround is to create own factory. Seems like workerFactories is empty list in WorkerFactoryModule.