Issue Migrating servlets to 10.1

[Campbell, Lance]

I am migrating from Java 8 tomcat 9 to Java 11 tomcat 10.1 .

I am getting a cast class exception when trying to access my login servlet. In 
my servlets I am using these packages:


import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


  1.  Does either Java 11 or Tomcat 10.1 require that I use Jakarta.servlet.* 
packages instead of javax.servlet.*?
  2.  If that is the case, then what is specifically requiring this? Is it Java 
11 or Tomcat 10.1 or both?

My servlet is getting this error:

21-Nov-2023 14:14:52.768 INFO [main] 
org.apache.catalina.core.ApplicationContext.log Marking servlet [LoginServlet] 
as unavailable
21-Nov-2023 14:14:52.769 SEVERE [main] 
org.apache.catalina.core.StandardContext.loadOnStartup Servlet [LoginServlet] 
in web application [] threw load() exception
        java.lang.ClassCastException: class xyz.servlet.LoginServlet cannot be 
cast to class jakarta.servlet.Servlet
(xyz.servlet.LoginServlet is in unnamed module of loader 
org.apache.catalina.loader.ParallelWebappClassLoader
@2ccca26f; jakarta.servlet.Servlet is in unnamed module of loader 
java.net.URLClassLoader @63e2203c)

Thanks,

Lance