HttpSessionListener.sessionCreated() not being called

I have a very simple Servlet and a very simple HttpSessionListener:

@WebServlet("/HelloWorld")
public class HelloWorld extends HttpServlet {
    private static final long serialVersionUID = 1L;


    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        getServletContext().setAttribute("applicationHits", new AtomicInteger(0));  
    }


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        System.out.println("get");

        ((AtomicInteger) request.getServletContext().getAttribute("applicationHits")).incrementAndGet();
        ((AtomicInteger) request.getSession(true).getAttribute("sessionHits")).incrementAndGet();
        request.setAttribute("requestHits", 0);

        getServletContext().getRequestDispatcher("/view/HelloWorld.jsp").forward(request, response);
    }

}

@WebListener
public class SessionListener implements HttpSessionListener {

    public SessionListener() {
    }

    public void sessionCreated(HttpSessionEvent arg0)  {
        System.out.println("session listener");
        arg0.getSession().setAttribute("sessionHits", new AtomicInteger(0));
    }

    public void sessionDestroyed(HttpSessionEvent arg0)  { 
    }

}

My HttpSessionListener.sessionCreated() method is never called (no log output), and I end up getting a NullPointerException on the line where I'm calling getSession()

((AtomicInteger) request.getSession(true).getAttribute("sessionHits")).incrementAndGet();
        request.setAttribute("requestHits", 0);

I tried calling getSession() without true as well, but same problem.

I don't get it - isn't the @WebListener annotation enough to invoke my listener? Eclipse even displays it as a listener under Deployment Descriptor/Listeners.

Turns out it was one of those stupid Eclipse issues...

Project->Clean... and restarting Tomcat did the trick.