Servlet 3.0's Annotation based Servlet registration sample

TestServlet.java

@WebServlet(urlPatterns = "/test")
public class TestServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        res.setContentType(MediaType.TEXT_PLAIN_VALUE);
        PrintWriter out = res.getWriter();
        out.write("Hello");
        out.close();
    }
}