In this servlet, we populate a key/value pair with an instance of java.util.
HashMap and pass that HashMap to the report template via the JasperRunManager.
runReportToPdfStream() method. As can be seen in the code, the Map 's key must
match the parameter name in the JRXML template. After deploying the servlet and
browsing the appropriate URL, we should see a PDF report being rendered in the
browser, as demonstrated in the following screenshot: