ServletContext context = ((WebApplication) getApplication()).getServletContext();
final File reportFile = new File(context.getRealPath("/reports/WebappReport.jasper"));
final Map parameters = new HashMap();
parameters.put("BaseDir", new File(context.getRealPath("/reports")));
JRResource pdfResource = new JRPdfResource(reportFile).setReportParameters(parameters).setReportDataSource(new WebappDataSource());
add(new EmbeddedJRReport("report", pdfResource));
}