@VisibleForTesting
  void parseSimple(InputStream in) {
    if (in == null) {
      settings = new HashMap<>();
    } else {
      ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
      try {
        settings = mapper.readValue(in, Map.class);
      } catch (IOException e) {
        throw new RuntimeException("Could not parse extension settings", e);
      }
    }
  }
{@link SettingsExtension} that reads configuration from YAML files on the classpath.
extensions/config/portability-config-yaml/src/main/java/org/datatransferproject/config/yaml/YamlSettingsExtension.java