Undertow does not call the init() method of servlets that implements SingleThreadModel even when load-on-startup is set

	<servlet>
		<servlet-name>testServlet</servlet-name>
		<servlet-class>TestServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>

@Slf4j
public class TestServlet extends HttpServlet implements SingleThreadModel {

	@Override
	public void init(ServletConfig config) throws ServletException {
		log.info("init() in TestServlet");
		super.init(config);
	}

	@Override
	public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		log.info("doGet() in TestServlet");
	}

	@Override
	public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		log.info("doPost() in TestServlet");
	}
}