dagger-2

I have a ViewModel class just like the one defined in the Connecting ViewModel and repository section of Architecture guide . When I run my app I get a runtime exception. Does anyone know how to get around this? Should I not be injecting the ViewModel? Is there a way to tell the ViewModelProvider to use Dagger to create the model? public class DispatchActivityModel extends ViewModel { private final API api; @Inject public DispatchActivityModel(API api) { this.api = api; } } Caused by: java.lang.InstantiationException: java.lang.Class has no zero argument constructor at java.lang.Class

This is a Canonical Question because there are a lot of misconceptions about object initialization with Dagger 2. If your question was flagged as a duplicate please read this post carefully and make sure to understand the difference between constructor injection and field injection. I try to inject a Context into my presenter, but I get a NullPointerException when trying to use it. class MyPresenter { @Inject Context context; private MyView view; @Inject MyPresenter(MyView view) { this.view = view; } } My module looks like this @Module class MyModule { @Provides MyPresenter provideMyPresenter

Build error after update from Kotling 1.3.21 to 1.3.30: AppComponent.java:16: error: [Dagger/MissingBinding] java.util.Map<java.lang.Class<? extends androidx.lifecycle.ViewModel>, javax.inject.Provider<androidx.lifecycle.ViewModel>> cannot be provided without an @Provides-annotated method. Reproduced on two different projects with similar dependencies on Kotlin, Dagger and Architecture components. I suspect it somehow related to the recent kapt updates in kotlin 1.3.30: https://blog.jetbrains.com/kotlin/2019/04/kotlin-1-3-30-released/ Tried to disable/enable the kapt options from the article,

I am following the guide here: https://github.com/ecgreb/dagger-2-testing-demo I have the following setup in my app/src/main (the injection and @Provides code omitted): public class FlingyApplication extends Application { @Singleton @Component(modules = { FlingyModule.class }) public interface FlingyComponent } @Module public class FlingyModule In app/src/test: public class TestFlingyApplication extends Application { @Singleton @Component(modules = { TestFlingyModule.class }) public interface TestFlingyComponent extends FlingyComponent } @Module public class TestFlingyModule So far, it is