public List<Employee> getEmployeesWithoutVacationsCriteria()
	{
		CriteriaBuilder builder = manager.getCriteriaBuilder();
		
		CriteriaQuery<Employee> critQuery = builder.createQuery(Employee.class);
		Root<Employee> root = critQuery.from(Employee.class);
		
		critQuery.select(root).where(builder.equal(builder.size(root.<List<VacationEntry>>get("vacations")), 0));
		
		TypedQuery<Employee> query = manager.createQuery(critQuery);
		
		return query.getResultList();
	}