public static class EchoContextListener implements ServletContextListener {

    static AtomicBoolean INIT = new AtomicBoolean(false);
    ServletContextEvent sce;

    @Override
    public void contextInitialized(ServletContextEvent sce) {
       INIT.set(true);
       this.sce = sce;
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
       INIT.set(false);
    }

}

@Test
public void echoContextListener() throws IOException, InterruptedException {
    server.addServletListener(EchoContextListener.class.getName());
    server.start();

    assertEquals(true, EchoContextListener.INIT.get());

    server.stop();

    assertEquals(false, EchoContextListener.INIT.get());
} 

@Override
public void start() {
    if (isStarted()) {
       throw new IllegalStateException("Already started");
    }
    worker = buildXnioWorker();
    buildDeploymentManager();
    buildPathHandler();
    buildAccessLogHandler();
    buildUndertow();

    undertow.start();
} 

private void buildDeploymentManager() {
    deploymentManager = Servlets.newContainer().addDeployment(buildDeploymentInfo());
    deploymentManager.deploy();
}

private void buildPathHandler() {
    try {
       this.pathHandler = Handlers.path(Handlers.redirect("/")).addPrefixPath("/",
             requireNonNull(deploymentManager).start());
    } catch (ServletException e) {
       throw new RuntimeException(e);
    }
}

private void buildAccessLogHandler() {
    accessLogHandler = new LogHttpHandler(requireNonNull(pathHandler), Predicates.truePredicate());
    accessLogHandler.start();
}

private void buildUndertow() {
    undertow = Undertow.builder().addHttpListener(config.getHttpPort(), config.getHost())
          .setWorker(requireNonNull(worker)).setDirectBuffers(true).setHandler(requireNonNull(accessLogHandler))
          .build();
}

public void stop() {
    if (!isStarted()) {
       return;
    }
    try {
       deploymentManager.undeploy();
       deploymentManager = null;
    } finally {
       try {
          accessLogHandler.stop();
          accessLogHandler = null;
       } finally {
          try {
             undertow.stop();
             undertow = null;
          } finally {
             worker.shutdown();
             worker = null;
          }
       }
    }
}