Resolving Singleton Issues with Component Dependencies in Dagger

Why do I receive an error about scoped bindings when using singletons with Dagger components?

@Component(modules = CCModule.class) 
public interface CComponent {
    XXX getXXX();
}

@Module
public class CCModule {
    @Provides @Singleton
    public XXX provideXXX(){
        return new XXX();
    }
}

@Component(dependencies = CComponent.class, modules = AAModule.class) 
public interface AComponent {
    YYY getYYY();
}

class YYY {
   @Inject
   public YYY(XXX xxx) {
       ...
   }
}

CComponent c_component = Dagger_CComponent.builder().cCModule(new CCModule()).build();

AComponent a_component = Dagger_AComponent.builder()
        .cComponent(c_component)
        .aAModule(new AAModule())
        .build();

The error arises due to a restrictions in Dagger regarding component scoping. When using the `@Singleton` annotation within a module, it mandates that the component that includes this module also be scoped appropriately. Your current setup does not align with Dagger's requirements for component dependencies and scoping.

@Singleton
@Component(modules = CCModule.class) 
public interface CComponent {
    XXX getXXX();
}

@Singleton
@Component(dependencies = CComponent.class, modules = AAModule.class) 
public interface AComponent {
    YYY getYYY();
} 

// Maintain the initialization code as it is.

Causes

• The `CComponent` is unscoped, meaning it does not declare a scope annotation, while `provideXXX` is annotated with `@Singleton`.
• Dagger does not allow an unscoped component to reference bindings that are scoped, as it cannot guarantee the singleton nature of the provided instances.

Solutions

• Add a `@Singleton` annotation to your `CComponent` definition.
• Ensure all components that refer to scoped bindings also have a matching scope annotation.

Mistake: Forgetting to annotate a component with the same scope as its dependencies.

Solution: Always ensure that your components match the scoping of their dependencies.

Mistake: Not following Dagger's guidelines on component hierarchy and scope management.

Solution: Review Dagger documentation on component scoping and hierarchies for best practices.