Criando relatorio com jasper

@WebServlet("/gastos")
public class RelatorioServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    try {
        String nome = request.getServletContext().getRealPath("/WEB-INF/jasper/gasto_por_mes.jasper");
        Connection connection = new ConnectionFactory().getConnection();        
        Map<String, Object> parametros = new HashMap<String, Object>();

        GeradorRelatorio gerador = new GeradorRelatorio(nome, parametros, connection);
        gerador.geraPDFParaOutputStream(response.getOutputStream());


        connection.close();
    } catch (SQLException e) {
        throw new ServletException(e);
    }         
    }
}

@RequestMapping(value = "/report/relatorio", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
	public String form(@RequestParam("id[]") int id[],
			@RequestParam("dateIni") @DateTimeFormat(pattern = "dd/MM/yyyy") Date dateIni,
			@RequestParam("dateFim") @DateTimeFormat(pattern = "dd/MM/yyyy") Date dateFim,
			@RequestParam("horaInit") String horaInit, @RequestParam("minutoInit") String minutoInit,
			@RequestParam("horaFim") String horaFim, @RequestParam("minutoFim") String minutoFim) throws JRException {

	
	Calendar cal = Calendar.getInstance();

	Relatorio relatorio = new Relatorio();
	
	relatorio.setTag((int) cal.getTimeInMillis());
	relatorio.setMachinesIds(id);
	relatorio.setDateIni(dateIni);
	relatorio.setDateFim(dateFim);
	relatorio.setHoraInit(horaInit);
	relatorio.setMinutoInit(minutoInit);
	relatorio.setHoraFim(horaFim);
	relatorio.setMinutoFim(minutoFim);
	
	System.out.println(relatorio.toString());
	
	for (int i = 0; i < relatorio.getMachinesIds().length; i++) {
		TemporaryMachineId tempMachine = new TemporaryMachineId();
		
		tempMachine.setMachineId(relatorio.getMachinesIds()[i]);
		tempMachine.setTag(relatorio.getTag());
		
		tempMachineDao.gravar(tempMachine);
	}
	
	//HttpServletRequest request = null;
	//String path = request.getServletContext().getRealPath("/WEB-INF/jasper/reportMaquinaData.jrxml");
	//JasperCompileManager.compileReportToFile(path);
	
	return "/relatorio/ok";
}