dagger2-example with Kotlin (1.7.x) kapt annotation processor supported Gradle build

kapt documentation

kapt-annotation-processing-for-kotlin

better-annotation-processing-supporting-stubs-in-kapt

Implement Annotation Processing API (JSR 269) natively in Kotlin

Use javac annotation processing implementation, generate AST stubs for Kotlin classes

Dagger2 site

Notes:-

• @Component
  • @Module
    • @Provides

Shows Planets being injected via constructor by qualifier

public class TerrestrialPlanets @Inject (@Named("Mercury") val mercury: Planet,
                                         @Named("Venus") val venus: Planet,
                                         @Named("Earth") val earth: Planet,
                                         @Named("Mars") val mars: Planet) {
}

The TerrestrialPlanetsModule, for example, provides a singleton named "Mercury" etc.

@Module
public class TerrestrialPlanetsModule {

    @Provides @Singleton @Named("Mercury")
    public fun first() : Planet {
        return Mercury()
    }

    @Provides @Singleton @Named("Venus")
    public fun second() : Planet {
        return Venus()
    }

    @Provides @Singleton @Named("Earth")
    public fun third() : Planet {
        return Earth()
    }

    @Provides @Singleton @Named("Mars")
    public fun fourth() : Planet {
        return Mars()
    }

}

• Outer Planets module
  • Jupiter
  • Saturn
  • Uranus
  • Neptune

---

Gradle build

./gradlew run

./gradlew test