RE: Unable to create default RequestDispatcher

[Prashanth Ettaboina]

Hi Grzegorz,

I'm not registering the ExampleServlet anywhere, I'm configuring them in 
web.xml.
In the web.xml we are giving the servlet and servlet mapping with url-pattern 
and class path.

Thanks,
Prashanth Ettaboina.

From: Prashanth Ettaboina
Sent: 14 November 2022 19:11
To: iss...@karaf.apache.org; dev@karaf.apache.org; u...@karaf.apache.org
Subject: Unable to create default RequestDispatcher

Hi Team,

I have updated my KARAF version from 4.2.15 to 4.4.1 and Java from 8 to 11 in 
my application.
Gone through the official Release notes and updated some dependencies as well.

Upgraded OSGI-Core from 6.0.0 to 8.0.0.
Upgraded osgi.compendium 5.0.0 to osgi.cmpn 7.0.0
Upgraded Jetty from 9.4.43.v20210629 to 9.4.46.v20220331.
Upgraded pax-web-spi from 4.3.4 to 7.2.11.
I'm using javax.servlet-api 3.1.0 version in my application.

I'm unable to create default RequestDispatcher.
Please check the below code lines.

public class ExampleServlet extends HttpServlet {
      protected void doGet(HttpServletRequest request, HttpServletResponse 
response) throws ServletException, IOException {
             RequestDispatcher requestDispatcher = 
getServletContext().getNamedDispatcher("default"); // get getServletContext() 
is calling the method in GenericServlet.
             requestDispatcher.include(request, response);
      }
}

the above code used to work fine before the version upgrades but now I'm 
getting the requestDispatcher as null.

Can anyone please look at it, let me know if I'm missing something.

Thanks,
Prashanth Ettaboina