@Nullable
  public static Sdk getInternalJavaSdk(final Sdk sdk) {
    final SdkAdditionalData data = sdk.getSdkAdditionalData();
    if (data instanceof Sandbox) {
      return ((Sandbox)data).getJavaSdk();
    }
    return null;
  }
@Nullable
  public static Sdk getInternalJavaSdk(final Sdk sdk)