fields.add(getColumn("videoWidth"));
fields.add(getColumn("videoHeight"));
criteria.setProjection(fields);
ModelViewResultTransformer<TutorialVideoDTO> resultTransformer = //
new ModelViewResultTransformer<TutorialVideoDTO>(new TutorialVideoDTOFactory());
criteria.setResultTransformer(resultTransformer);
List<TutorialVideoDTO> tutorialVideoSet = criteria.list();
return new HashSet<TutorialVideoDTO>(tutorialVideoSet);