I'm writing a pretty simple sample project for familiarizing myself with Jasper Reports. I'd like to export a report I've configured to a PDF `OutputStream`, but there's no factory method for it:

```
InputStream template = JasperReportsApplication.class
    .getResourceAsStream("/sampleReport.xml");
JasperReport report = JasperCompileManager.compileReport(template);
JasperFillManager.fillReport(report, new HashMap<String, String>());
// nope, just chuck testa.  
//JasperExportManager.exportReportToPdfStream(report, new FileOutputStream(new File("/tmp/out.pdf")));

```

How can I get the PDF in an `OutputStream`?