EDIT

import org.hibernate.criterion.Projections;

import eu.etaxonomy.cdm.model.description.DescriptionElementSource;

import eu.etaxonomy.cdm.model.name.HybridRelationship;

import eu.etaxonomy.cdm.persistence.query.OrderHint;

	@Override

    public <T extends DescriptionElementSource>  Long countWithNameUsedInSource(Class<T> clazz){

        Criteria criteria = getSession().createCriteria(HybridRelationship.class);

        clazz = clazz != null? clazz : (Class<T>) DescriptionElementSource.class;

        Criteria crit = getSession().createCriteria(clazz);

        //count

        criteria.setProjection(Projections.rowCount());

        long result = (Long)criteria.uniqueResult();

        return result;

	}

	@Override

	public <T extends DescriptionElementSource> List<T> listWithNameUsedInSource(Class<T> clazz,

	        Integer pageSize, Integer pageNumber,List<OrderHint> orderHints, List<String> propertyPaths){

	    clazz = clazz != null? clazz : (Class<T>) DescriptionElementSource.class;

	    Criteria crit = getSession().createCriteria(clazz);

	    crit.add(Restrictions.isNotNull("nameUsedInSource"));

	    crit.addOrder(Order.desc("created"));

	    @SuppressWarnings({ "unchecked" })

	    List<T> results = crit.list();

	    return results;

	}

import eu.etaxonomy.cdm.model.description.DescriptionElementSource;

import eu.etaxonomy.cdm.persistence.query.OrderHint;

    public <T extends DescriptionElementSource> List<T> listWithNameUsedInSource(Class<T> clazz, Integer pageSize, Integer pageNumber,

            List<OrderHint> orderHints, List<String> propertyPaths);

    public <T extends DescriptionElementSource> Long countWithNameUsedInSource(Class<T> clazz);

import eu.etaxonomy.cdm.model.name.NomenclaturalSource;

    /**

     * Returns all or a page of all original spellings in the database.

     * As original spellings are

     *

     * @param pageSize the page size

     * @param pageStart the number of the page

     * @param orderHints the order hints

     * @param propertyPaths the property path to initialize the resulting objects

     * @return list of nomenclatural the filter criteria

     */

    public List<NomenclaturalSource> listOriginalSpellings(Integer pageSize,

            Integer pageNumber, List<OrderHint> orderHints, List<String> propertyPaths);

import eu.etaxonomy.cdm.model.name.NomenclaturalSource;

import eu.etaxonomy.cdm.persistence.dao.reference.IOriginalSourceDao;

    private IOccurrenceService occurrenceService;

    private ICollectionService collectionService;

    private ITaxonService taxonService;

    private ICommonService commonService;

    private ISourcedEntityDao<SourcedEntityBase<?>> sourcedEntityDao;

    private IOriginalSourceDao sourcedDao;

    @Override

    public List<NomenclaturalSource> listOriginalSpellings(Integer pageSize, Integer pageNumber,

            List<OrderHint> orderHints, List<String> propertyPaths) {

        Long numberOfResults = sourcedDao.countWithNameUsedInSource(NomenclaturalSource.class);

        List<NomenclaturalSource> results = new ArrayList<>();

        if(numberOfResults > 0) {

            results = sourcedDao.listWithNameUsedInSource(NomenclaturalSource.class, pageSize, pageNumber, orderHints, propertyPaths);

        }

        return results;

    }