code: public static CronMapper fromCron4jToQuartz() {
          return new CronMapper(
                  CronDefinitionBuilder.instanceDefinitionFor(CronType.CRON4J),
                  CronDefinitionBuilder.instanceDefinitionFor(CronType.QUARTZ),
                  setQuestionMark()
          );
      }
docs: Creates a CronMapper that maps a cron4j expression to a quartz expression.
  @return a CronMapper for mapping from cron4j to quartz