code: public void setAuditorAware(AuditorAware<?> auditorAware) {
  
  		Assert.notNull(auditorAware, "AuditorAware must not be null!");
  		this.auditorAware = Optional.of(auditorAware);
  	}
docs: Setter to inject a {@code AuditorAware} component to retrieve the current auditor.
  @param auditorAware must not be {@literal null}.