Errormessage using extending HttpServlet

I'm having a class that extends HttpServlet. When I'm making a RequestDispatcherobject I get the following errormessage:
java.lang.IllegalStateException: ServletConfig has not been initialized
at javax.servlet.GenericServlet.getServletContext(GenericServlet.java:185)
public class RegUserController extends HttpServlet {
public void init( ServletConfig config )
throws ServletException {
// call superclass's init method for initialization
super.init( config );
Does anyone know what I'm doing wrong?

I'm making a RequestDispatcherobject in class
RegUserController. What do you write inside the init
method? Nothing more that you have.
Is your custom servlet registered in web.xml via <servlet>...</servlet> and <servlet-mapping>...</servlet-mapping> components?
Has your Servlet been generated, called, and initiated from within normal Servlet activity? Meaning, did you call
RegUserController controller = new RegUserController();
Or did you let the servlet container do all the instantiation for you and you just get to this point when a request is made to it?

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