EDIT

    /**

     * {@inheritDoc}

     */

    @Override

    public List<FieldUnit> getFieldUnitsForGatheringEvent(UUID gatheringEventUuid, Integer limit, Integer start, List<OrderHint> orderHints, List<String> propertyPaths) {

        String queryString = "FROM SpecimenOrObservationBase s WHERE s.gatheringEvent.uuid = :gatheringEventUuid";

        if(orderHints != null && orderHints.size() > 0){

            queryString += " order by ";

            String orderStr = "";

            for(OrderHint orderHint : orderHints){

                if(orderStr.length() > 0){

                    orderStr += ", ";

                }

                queryString += "descriptions." + orderHint.getPropertyName() + " " + orderHint.getSortOrder().toHql();

            }

            queryString += orderStr;

        }

        Query query = getSession().createQuery(queryString);

        query.setParameter("gatheringEventUuid", gatheringEventUuid);

        if(limit != null) {

            if(start != null) {

                query.setFirstResult(start);

            } else {

                query.setFirstResult(0);

            }

            query.setMaxResults(limit);

        }

        List results = query.list();

        defaultBeanInitializer.initializeAll(results, propertyPaths);

        return results;

    }

import eu.etaxonomy.cdm.model.occurrence.GatheringEvent;

    /**

     *

     * Returns all {@link FieldUnit}s that are referencing this {@link GatheringEvent}

     * @param gatheringEventUuid the {@link UUID} of the gathering event

     * @param limit

     * @param start

     * @param orderHints

     * @param propertyPaths

     * @return a list of field units referencing the gathering event

     */

    public List<FieldUnit> getFieldUnitsForGatheringEvent(UUID gatheringEventUuid, Integer limit, Integer start, List<OrderHint> orderHints, List<String> propertyPaths);

import eu.etaxonomy.cdm.model.occurrence.GatheringEvent;

    /**

     * Returns all {@link FieldUnit}s that are referencing this {@link GatheringEvent}

     * @param gatheringEventUuid the {@link UUID} of the gathering event

     * @return a list of field units referencing the gathering event

     */

    public List<FieldUnit> getFieldUnitsForGatheringEvent(UUID gatheringEventUuid);

    /**

     * {@inheritDoc}

     */

    @Override

    public List<FieldUnit> getFieldUnitsForGatheringEvent(UUID gatheringEventUuid) {

        return dao.getFieldUnitsForGatheringEvent(gatheringEventUuid, null, null, null, null);

    }

        /**

         * {@inheritDoc}

         */

        @Override

        public List<FieldUnit> getFieldUnitsForGatheringEvent(UUID gatheringEventUuid) {

            return null;

        }