Servlet mapping problem

[Em Aiy]

I have a servlet to download a file, i had made the web.xml accordingly, but it is not working fine ... it is giving the following error

java.lang.NullPointerException
org.apache.jasper.util.SystemLogHandler.findStream(SystemLogHandler.java:105)
org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214)
org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214)
org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214)
org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214)
DownloadReport.processRequest(DownloadReport.java:30)
DownloadReport.doGet(DownloadReport.java:169)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
 

The web.xml which contains its entries is

  <servlet>
    <servlet-name>DownloadReport</servlet-name>
    <servlet-class>DownloadReport</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>DownloadReport</servlet-name>
    <url-pattern>/DownloadReport</url-pattern>
  </servlet-mapping>

please help me out

[Gregg Bolinger]

You'll need to look at your DownloadReport class to find the problem. Here is a hint:

DownloadReport.processRequest(DownloadReport.java:30)