Retrofit2 Handle condition when status code 200 but json structure different than datamodel class

Question

I\'m using Retrofit2 and RxJava2CallAdapterFactory.

The API I consume returns status code always as 200 and for success and response JSON string the JSON st

Answer 1

One possible solution is to make Gson fail on unknown properties. There seems to be an issue raised already(https://github.com/google/gson/issues/188). You can use the workaround provided in the issue page. So the steps are as follows:

Add the workaround ValidatorAdapterFactory to the code base:

public class ValidatorAdapterFactory implements TypeAdapterFactory {

@Override
public  TypeAdapter create(Gson gson, TypeToken type) {
    // If the type adapter is a reflective type adapter, we want to modify the implementation using reflection. The
    // trick is to replace the Map object used to lookup the property name. Instead of returning null if the
    // property is not found, we throw a Json exception to terminate the deserialization.
    TypeAdapter delegate = gson.getDelegateAdapter(this, type);

    // Check if the type adapter is a reflective, cause this solution only work for reflection.
    if (delegate instanceof ReflectiveTypeAdapterFactory.Adapter) {

        try {
            // Get reference to the existing boundFields.
            Field f = delegate.getClass().getDeclaredField("boundFields");
            f.setAccessible(true);
            Map boundFields = (Map) f.get(delegate);

            // Then replace it with our implementation throwing exception if the value is null.
            boundFields = new LinkedHashMap(boundFields) {

                @Override
                public Object get(Object key) {

                    Object value = super.get(key);
                    if (value == null) {
                        throw new JsonParseException("invalid property name: " + key);
                    }
                    return value;

                }

            };
            // Finally, push our custom map back using reflection.
            f.set(delegate, boundFields);

        } catch (Exception e) {
            // Should never happen if the implementation doesn't change.
            throw new IllegalStateException(e);
        }

    }
    return delegate;
    }

}

Build a Gson object with this TypeAdaptorFactory:

Gson gson = new GsonBuilder().registerTypeAdapterFactory(new ValidatorAdapterFactory()).create()

And then use this gson instance in GsonConverterFactory like below:

apiClient = new Retrofit.Builder()
                .baseUrl(url)
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .addConverterFactory(GsonConverterFactory.create(gson)) //Made change here
                .client(httpClient)
                .build();

This should throw an error if the unmarshalling step finds an unknown property, in this case the error response structure.