How should I inject custom ObjectMapper using compile-time dependency injection in Java?

[David Pinn]

I have a BuiltInComponents implementation like this:

import play.core.ObjectMapperComponents;
...
final class MyComponents extends BuiltInComponentsFromContext

        implements HttpFiltersComponents, AssetsComponents,
        AhcWSComponents, EhCacheComponents, ObjectMapperComponents {
...


    @Override
    public ObjectMapper objectMapper() {
        ObjectMapper mapper = Json.newDefaultMapper()
                .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
                .registerModule(new Jdk8Module());
        Json.setObjectMapper(mapper);
        applicationLifecycle().addStopHook(() -> {
            Json.setObjectMapper(null);
            return CompletableFuture.completedFuture(null);
        });
        return mapper;
    }


...
}

The compiler is yelling at me: "MyComponents is not abstract and does not override abstract method applicationLifecycle() in play.core.ObjectMapperComponents". 

I believe that's because applicationLifecycle() in ObjectMapperComponents returns play.api.inject.ApplicationLifecycle; but in BuiltInComponentsFromContext the applicationLifecycle() method returns play.inject.ApplicationLifecycle. What to do?

Am I going about setting up the custom ObjectMapper in the right way?

[Greg Methvin]

play.core.ObjectMapperComponents is actually scala api. You already have implemented the `objectMapper()` method so you don't really need ObjectMapperComponents anyway, do you?

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Greg Methvin

Tech Lead - Play Framework

Lightbend, Inc.