[RESOLVIDO]Obter o real Caminho arquivo fisico

public void create(List dados, HashMap parameters, String reportName, boolean thereAreSubReports) throws ReportException {

		FacesContext facesContext = FacesContext.getCurrentInstance();
		HttpServletResponse response = (HttpServletResponse) facesContext.getExternalContext().getResponse();
		InputStream reportStream = facesContext.getExternalContext().getResourceAsStream("/WEB-INF/classes/br/com/renaissance/reports/" + reportName + ".jasper");

		if(thereAreSubReports){
			parameters.put("SUBREPORT_DIR", facesContext.getExternalContext().getRealPath("/WEB-INF/classes/br/com/renaissance/reports/").concat("\\"));
		}

		JRDataSource jrds = new JRBeanCollectionDataSource(dados);

		try {
			ServletOutputStream servletOutputStream = response.getOutputStream();
			response.setContentType("application/pdf");
			facesContext.responseComplete();

			try {
				JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream, parameters, jrds);
			} catch (JRException e) {
				throw new ReportException(e.getMessage());
			}
			servletOutputStream.flush();
			servletOutputStream.close();
		} catch (IOException e) {
			throw new ReportException(e.getMessage());
		} catch (Exception e) {
			throw new ReportException(e.getMessage());
		}
	}