public ParkingSpace createParkingSpace(int slot, String label)
	{
		try
		{
			begin();
			ParkingSpace parkingSpace = new ParkingSpace(slot, label);
			manager.persist(parkingSpace);
			commit();
			return parkingSpace;
		}
		catch(PersistenceException e)
		{
			e.printStackTrace();
			rollback();
			throw e;
		}
	}