code: Set<Class<? extends TrailWriter>> findTrailWriters() {
          Set<Class<? extends TrailWriter>> trailWriters = auditConfig.getWriters();
          if (trailWriters.isEmpty()) {
              LOGGER.info("No TrailWriter specified");
          }
          return trailWriters;
      }
docs: Finds the trail writers as configured in the props.
  
  @return a collection of trail writer classes.