GenericDao class

public class PersistenceManagerHibernate extends HibernateDaoSupport implements PersistenceManager {

	protected Logger logger = Logger.getLogger(PersistenceManager.class.getName());
	
	public PersistenceManagerHibernate() {
		super();
	}


	@SuppressWarnings("unchecked")
	public <T> List<T> findAll(Class<T> entityClass) throws DataAccessException {

		//getHibernateTemplate().setCacheQueries(true);
		List<T> results = getHibernateTemplate().loadAll(entityClass);
		
		Set<T> set = new HashSet<T>(results);
		results = new ArrayList<T>(set);
		return results;
	}

	
	@SuppressWarnings("unchecked")
	public <T> T findById(Class<T> entityClass, Long id) throws DataAccessException {
	
		//getHibernateTemplate().setCacheQueries(true);
		T o = (T) getHibernateTemplate().get(entityClass, id);
		if(o == null){
			logger.warn("uh oh, document with id '" + id + "' not found...");
			throw new ObjectRetrievalFailureException(entityClass, id);
		}
		else {
			return o;
		}
	}
	
	public <T> void saveOrUpdate(T entity) throws DataAccessException {
		getHibernateTemplate().saveOrUpdate(entity);
	}


	@SuppressWarnings("unchecked")
	public <T> T merge(T entity) throws DataAccessException {
		return (T) getHibernateTemplate().merge(entity);
	}


	public <T> void remove(T entity) throws DataAccessException {
		getHibernateTemplate().delete(entity);
	}

	public <T> void removeAll(Class<T> entityClass) throws DataAccessException {
		getHibernateTemplate().deleteAll(this.findAll(entityClass));
	}

	@SuppressWarnings("unchecked")
	public <T> List<T> findByNamedQueryAndNamedParam(Class<T> entityClass,
			String queryName, String[] paramNames, Object[] values) throws DataAccessException {

		List<T> results = (List<T>) getHibernateTemplate().findByNamedQueryAndNamedParam(queryName, paramNames, values);
		return results;
	}

	public <T> List<T> findByNamedQueryAndNamedParam(Class<T> entityClass,
			String queryName, Map<String, ?> params) throws DataAccessException {

		String[] paramNames = new String[params.size()];
		Object[] values = new Object[params.size()];
		
		List<String> keys = new ArrayList<String>(params.keySet());
		for(int i=0; i<keys.size(); i++){
			String k = keys.get(i);
			paramNames[i] = k;
			values[i] = params.get(k);
		}
		
		return this.findByNamedQueryAndNamedParam(entityClass, queryName, paramNames, values);
	}

	@SuppressWarnings("unchecked")
	public <T> List<T> findByNamedParam(Class<T> entityClass, String query,
			String[] paramNames, Object[] values) throws DataAccessException {
		
		List<T> results = (List<T>) getHibernateTemplate().findByNamedParam(query, paramNames, values);
		return results;
		
	}

	@SuppressWarnings("unchecked")
	public <T> List<T> findByNamedParam(Class<T> entityClass, String query,
			Map<String, ?> params) throws DataAccessException {
		
		String[] paramNames = new String[params.size()];
		Object[] values = new Object[params.size()];
		
		List<String> keys = new ArrayList<String>(params.keySet());
		for(int i=0; i<keys.size(); i++){
			String k = keys.get(i);
			paramNames[i] = k;
			values[i] = params.get(k);
		}
		
		List<T> results = (List<T>) getHibernateTemplate().findByNamedParam(query, paramNames, values);
		return results;
		
	}
}