AndroidAnnotations with Spring Rest Template does not work when obfuscated

Question

My Android application uses AndroidAnnotations and Spring Rest Template. When creating a debug build, it runs fine. When I create a release build however, the REST call does not work. Below are some relevant snippets from my code and build configuration.

Activity

public class MyActivity extends Activity {
    @Bean
    protected MyService myService;

    @Background
    protected void fetchData() {
        try {
            data = myService.getData();
        } catch (DataAccessException dae) {
            Log.e(getClass().getSimpleName(), dae.getMessage(), dae);
        }
    }
}

Service

@EBean
public class MyService {
    @RestService
    protected MyRestClient myRestClient;

    public Data getData() {
        return myRestClient.getData();
    }
}

RestClient

@Rest(converters = { GsonHttpMessageConverter.class },
      interceptors = { AuthenticationInterceptor.class, UserAgentInterceptor.class },
      rootUrl = "https://myhost/rest")
public interface MyShiftRestClient {
    @Get("/data")
    Data getData();
}

ProGuard configuration

-dontwarn org.apache.http.annotation.Immutable
-dontwarn org.apache.http.annotation.NotThreadSafe
-dontwarn org.springframework.**

-keep class com.mypackage.** {
  public protected private *;
}

-keepclassmembers public class org.springframework.** {
   public *;
}

When running the obfuscated app, the Data object that is returned by MyRestClient is an empty object, i.e. it is initialised but none of its instance variables have any values. I guess it has to do with my ProGuard configuration, that's why I added the last configuration statement, but it had no effect. There is no Exception being logged.

Answer 1

Try to keep members of Data class too. Data class properties must be untouched to allow Gson converter fill it, as it is done based on property names.

Good luck.