ExecutionPeriod element = (ExecutionPeriod) iter.next();
IExecutionPeriod element = (IExecutionPeriod) iter.next();
    public List readPublic() throws ExcepcaoPersistencia {           Collection executionPeriods = readAll(ExecutionPeriod.class);           List executionPeriodsAux = new ArrayList();             for (Iterator iter = executionPeriods.iterator(); iter.hasNext();) {            ExecutionPeriod element = (ExecutionPeriod) iter.next();            if((!element.getState().equals(PeriodState.NOT_OPEN)) &&                     (element.getSemester().compareTo(new Integer(0)) > 0))                executionPeriodsAux.add(element);        }             return executionPeriodsAux;    }