apollo-core/src/main/java/com/ctrip/framework/foundation/internals/provider/DefaultApplicationProvider.java/DefaultApplicationProvider/initialize
class DefaultApplicationProvider:  @Override
  public void initialize(InputStream in) {
    try {
      if (in != null) {
        try {
          m_appProperties
              .load(new InputStreamReader(new BOMInputStream(in), StandardCharsets.UTF_8));
        } finally {
          in.close();
        }
      }

      initAppId();
      initAppLabel();
      initAccessKey();
    } catch (Throwable ex) {
      logger.error("Initialize DefaultApplicationProvider failed.", ex);
    }
  }