I needed to make the following SQL query with Hibernate 
SELECT COUNT(*), state FROM download_request WHERE id IN (<id list>) GROUP BY state;
and being new to Hibernate it came out a lot differently than how I thought it would. To perform the IN query a Criteria query needs to be created 
Criteria criteria = session.createCriteria(DownloadRequestEntity.class)
    .add(Restrictions.in("id", ids))
For the count and order by a Projection needs to be added to the criteria 
ProjectionList projectionList = Projections.projectionList();
projectionList.add(Projections.groupProperty("state"));
projectionList.add(Projections.rowCount());
criteria.setProjection(projectionList);
This is the resulting code 
public Map getStateCounts(final Collection ids) {
  HibernateSession hibernateSession = new HibernateSession();
  Session session = hibernateSession.getSession();
  Criteria criteria = session.createCriteria(DownloadRequestEntity.class)
	.add(Restrictions.in("id", ids));
  ProjectionList projectionList = Projections.projectionList();
  projectionList.add(Projections.groupProperty("state"));
  projectionList.add(Projections.rowCount());
  criteria.setProjection(projectionList);
  List results = criteria.list();
  Map stateMap = new HashMap();
  for(Object[] obj: results) {
      	DownloadState downloadState = (DownloadState)obj[0];
       	stateMap.put(downloadState.getDescription().toLowerCase(), (Integer)obj[1]);
  }
  hibernateSession.closeSession();
  return stateMap;
}
Something completely different from what I expected. That's what I love about solving problems sometimes the solution is something you might never expect.