Attempt to invoke virtual method 'java.lang.String java.lang.Package.getName()' - from Retrofit generating implementations from interfaces

Curious if this is currently supported. I have tried many different things but none seem to work.
The issue seems to stem from the fact that the Retrofit (http://square.github.io/retrofit/) library generates implementations from interfaces and relies on the ability to take say an interface file (for example):

public interface SpotifyService {...

And generate an implementation by doing this restAdapter.create(SpotifyService.class) which crashes immediately with:

com.tns.NativeScriptException: 
Error: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Package.getName()' on a null object reference
    com.tns.Runtime.getTypeMetadata(Runtime.java:426)
    com.tns.Runtime.getTypeMetadata(Runtime.java:403)
    com.tns.Runtime.callJSMethodNative(Native Method)
    com.tns.Runtime.dispatchCallJSMethodNative(Runtime.java:861)
    com.tns.Runtime.callJSMethodImpl(Runtime.java:726)
    com.tns.Runtime.callJSMethod(Runtime.java:712)
    com.tns.Runtime.callJSMethod(Runtime.java:693)
    com.tns.Runtime.callJSMethod(Runtime.java:683)

The library I'm trying to use does this here:
https://github.com/kaaes/spotify-web-api-android/blob/master/spotify-api/src/main/java/kaaes/spotify/webapi/android/SpotifyApi.java#L69

Is there a way to make this work currently or is support for this planned and if so, it would be much appreciated to know approximately when?

UPDATE:
I found this https://github.com/NativeScript/android-runtime/pull/501, curious if it's related and if that PR which is now merged will make something like the above possible with 2.2.0?

/cc @bradmartin

spotify-api/src/main/java/kaaes/spotify/webapi/android/SpotifyApi.java の69行目付近にある失敗している呼び出しと、Runtime.java の426行目および403行目付近にあるスタックトレースの位置から始めてください。リンクされている android-runtime の pull request 501 を確認し、インターフェースから生成された実装に対応しているかどうかを判断してください。完了とするには、restAdapter.create(SpotifyService.class) が動作することを確認するか、引き続きサポートされていないことを文書化する必要があります。