Dynamic context registration

In the preceding servlets and web components section, we saw how to declare a servlet and its context path through the @WebServlet annotation or through the web.xml descriptor file. The same thing can be done dynamically at the programming level. As an example, we will write a servlet without context path and a context listener that dynamically registers the servlet. Here's the servlet:

public class RegistrationDynamicServlet extends HttpServlet {
   @Override
   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      resp.getWriter().print("dynamic GET");
   }
}

This is the context listener:

@WebListener
public class RegistrationContextListener implements ServletContextListener {
   @Override
   public void contextInitialized(ServletContextEvent sce) {
       ServletRegistration.Dynamic registration = sce.getServletContext().addServlet("dynamic",RegistrationDynamicServlet.class);
       registration.addMapping...