Static Key Registry

final class ServerOptions implements StaticConfigComments {
  @ConfigComment("Address used by the public listener.")
  static final ConfigProperty<String> HOST =
    ConfigProperty.of("server.host", String.class, "0.0.0.0");

  @ConfigComment("Port used by the public listener.")
  static final ConfigProperty<Integer> PORT =
    ConfigProperty.of("server.port", Integer.class, 25565);

  @ConfigComment("Whether metrics should be collected.")
  static final ConfigProperty<Boolean> METRICS =
    ConfigProperty.of("features.metrics", Boolean.class, true);

  private ServerOptions() {
  }

  @Override
  public void registerComments(StaticConfigCommentRegistry comments) {
    comments.setRootComment("Application configuration.");
    comments.setComment("server", "Network listener settings.");
    comments.setComment("features", "Feature toggles.");
  }
}

var store = StaticConfigStore.builder()
  .holders(ServerOptions.class)
  .format(YamlConfigFormat.INSTANCE)
  .build();

var session = store.update(Path.of("config.yml"));

var host = session.get(ServerOptions.HOST);
var port = session.get(ServerOptions.PORT);
var metrics = session.get(ServerOptions.METRICS);