[RESOLVIDO]Ajuda com código do IREPORT

@Action
    public void Gerar() throws JRException {
        JasperPrint jp = null;
        TableModel model = new ReportTableModel();
        JRTableModelDataSource ds = new JRTableModelDataSource(model);
        System.out.println("this.reportTable.getRowCount() = " + this.reportTable.getRowCount());
        for (int j = 0; j < this.reportTable.getRowCount(); j++) {
            Map registro = new HashMap();
            String date = this.reportTable.getValueAt(j, 0).toString();
            System.out.println("dt = " + date);
            String vol = this.reportTable.getValueAt(j, 1).toString();
            System.out.println("vol = " + vol);
            String desc = this.reportTable.getValueAt(j, 2).toString();
            System.out.println("desc = " + desc);
            String port = this.reportTable.getValueAt(j, 3).toString();
            System.out.println("port = " + port);
            registro.put("data", date);
            registro.put("desc", desc);
            registro.put("vol", vol);
            registro.put("port", port);
        try {
            jp = JasperFillManager.fillReport("report4.jasper", registro, ds);
           
         } catch (JRException e) {
            e.printStackTrace();
        }
     }
     JasperViewer.viewReport(jp, false);
    }