public String getJobConfigFactory() {
    String configFactoryClassName = get(CONFIG_JOB_CONFIG_FACTORY);
    if (configFactoryClassName == null) {
      configFactoryClassName = PropertiesConfigFactory.class.getCanonicalName();
      LOG.warn("{} not specified. Defaulting to {}", CONFIG_JOB_CONFIG_FACTORY, configFactoryClassName);
    }
    return configFactoryClassName;
  }
@see BaseResourceConfig#CONFIG_JOB_INSTALLATIONS_PATH
@return the config factory class that has to be used to parse job configurations. If the config key
{@link BaseResourceConfig#CONFIG_JOB_INSTALLATIONS_PATH} is not defined, then returns the {@link PropertiesConfigFactory} class name.
samza-rest/src/main/java/org/apache/samza/rest/resources/BaseResourceConfig.java