생성자가 만들어지는 시점..

다음 코드에서 생성자가 만들어지는 시점이 궁금한데요

ServletApplication으로 서버를 키면 생성자가 만들어져 저코드가 메모리에 저장되었다가  요청이 들어오면 밑 코드를 사용하여 맵핑을 찾는건가요 ?

String requestURL = request.getRequestURI();
ControllerV1 controller = controllerMap.get(requestURL);

@WebServlet(name = "frontControllerServletV1",urlPatterns = "/front-controller/v1/*")
public class FrontControllerServletV1 extends HttpServlet {

    private Map<String,ControllerV1> controllerMap = new HashMap<>();

    public FrontControllerServletV1() {
        controllerMap.put("/front-controller/v1/members/new-form",new MemberFromControllerV1());
        controllerMap.put("/front-controller/v1/members/save",new MemberSaveControllerV1());
        controllerMap.put("/front-controller/v1/members",new MemberListControllerV1());
    }

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String requestURL = request.getRequestURI();
        ControllerV1 controller = controllerMap.get(requestURL);
        if(controller==null){
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            return ;
        }
        controller.process(request,response);
    }
}