EDIT

@Transactional(readOnly=true)

public class MediaServiceImpl extends IdentifiableServiceBase<Media,IMediaDao> implements IMediaService {

    public static final Integer IMAGE_READ_TIMEOUT = 3000;

    @Override

    @Autowired

	protected void setDao(IMediaDao dao) {

            String message = null;

            if (ref instanceof MediaRepresentation){

                continue;

                TextData textData = HibernateProxyHelper.deproxy(ref, TextData.class);

                if (description instanceof TaxonDescription){

                    TaxonDescription desc = HibernateProxyHelper.deproxy(description, TaxonDescription.class);

                        result.setAbort();

                    }

                }

               message = "The media can't be deleted from the database because it is referenced by a mediaspecimen. ("+((MediaSpecimen)ref).getTitleCache()+")";

               result.setAbort();

            }else {

            if (message != null){

                result.addException(new ReferencedObjectUndeletableException(message));

                result.addRelatedObject(ref);

            }

        }

        return result;

        }

        if(metadata == null) {

        }

        return metadata;

    }

    protected List<String> mediaMetadataKeyExludes(){

        CdmPreference pref = prefsService.findExact(CdmPreference.NewKey(PreferenceSubject.NewDatabaseInstance(), PreferencePredicate.MediaMetadataKeynameExcludes));

        if(pref == null) {

        }

        return pref.splitStringListValue();

    }

        }

        return pref.splitStringListValue();

    }

}