public void createTestData() throws ApplicationException {
PostgreSQLUtil.truncateTables(artistRecommendationDao);
List<ArtistRelation> artistRelations = new ArrayList<>();
for (Artist targetArtist : asList(madonna, cyndi, celine, kylie)) {
artistRelations.add(new ArtistRelation(targetArtist, 0.33f));
}
artistRelationDao.createArtistRelations(cher, artistRelations);
tagDao.createTags(asList("disco"));
tagDao.createTopArtists(Arrays.asList(new TagTopArtists("disco",