Something

   private void CetakActionPerformed(java.awt.event.ActionEvent evt) {                                      
        String fileName ="/home/toni/Data/netbeans/iReport/";
        Map map = new HashMap();
map.put("nama", "saiful haqqi");
        try {
            JasperCompileManager.compileReportToFile(fileName + "Nama1.jrxml");
            JasperFillManager.fillReportToFile(fileName + "Nama1.jasper", map, getConnection());
            JasperViewer.viewReport(fileName + "Nama1.jrprint", false);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }