Timertask calling method twice

Question

I have a TimerTask which calls a method every 1 minute, but the method is called twice. This method checks some factors and sends an email, as the method is called twice the email is sent twice. Does anyone know where the problem might be?

private void tarefa() {
        new Timer().schedule(
                new TimerTask() {
                    @Override
                    public void run() {
                        alertaGeral();
                        System.out.println("Alertando..");
                    }

                }, 0, 1000 * 60 * 1);
    }

Method that is called in the TimerTask:

private void alertaGeral() {
        try {
            DateFormat df = new SimpleDateFormat("HH:mm");
            String hora = df.format(new Date());

            SimpleDateFormat formatador = new SimpleDateFormat("HH:mm");
            Date hour = formatador.parse(hora);
            Time time = new Time(hour.getTime());

            Calendar alertDate = Calendar.getInstance();
            alertDate.setTime(time);
            alertDate.add(Calendar.MINUTE, 0);

            Date d = new Date();
            SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
            String data = dateFormat.format(d);
            SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
            Date dataf = formatter.parse(data);

            List<Compromisso> lista = atualizarDataInicial(s);

            for (Compromisso c : lista) {
                Time time1 = new Time(c.getHoraInicial().getTime());
                java.util.Date utilDate = new java.util.Date(c.getDataInicio().getTime());
                Calendar alertHour = Calendar.getInstance();
                alertHour.setTime(time1);
                alertHour.add(Calendar.MINUTE, -5);

                if (alertHour.compareTo(alertDate) == 0 && utilDate.compareTo(dataf) == 0) {
                    EnviaEmail e = new EnviaEmail();
                    e.enviaEmail(c.getNomeBeneficiario(), c.getDataInicio(), c.getHoraInicial(), c.getCompromisso());
                }
                System.out.println("HORA INICIAL CORRETA: " + c.getHoraInicial());
                System.out.println("HORA INICIAL ADIANTADA: " + alertHour.getTime());
                System.out.println("HORA SISTEMA " + alertDate.getTime());

            }
        } catch (ParseException ex) {
            ex.printStackTrace();
        }
    }