Getting Started on Undertow Server

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 <dependency>
        <groupId>io.undertow</groupId>
        <artifactId>undertow-core</artifactId>
        <version>${undertow.version}</version>
 </dependency>
 <dependency>
        <groupId>io.undertow</groupId>
        <artifactId>undertow-servlet</artifactId>
        <version>${undertow.version}</version>
 </dependency>
 <dependency>
        <groupId>io.undertow</groupId>
        <artifactId>undertow-websockets-jsr</artifactId>
        <version>${undertow.version}</version>
 </dependency

1. undertow-core: Undertow core, which provides support for non blocking handlers and web sockets
2. undertow-servlet: Support for Servlet 3.1
3. undertow-websockets-jsr: for the Java API for Websockets (JSR-356) standard

public class HelloWorldServer {

    public static void main(final String[] args) {
        Undertow server = Undertow.builder()
                .addHttpListener(8080, "localhost")
                .setHandler(new HttpHandler() {
                    @Override
                    public void handleRequest(final HttpServerExchange exchange) throws Exception {
                        exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/html");
                        StringBuilder output = new StringBuilder("<h1>Checking Status Undertow</h1>");
                        output.append("<h3 style='color:green'>I am up and running at port 8080!!!</h3>");
                        exchange.getResponseSender().send(output.toString());
                    }
                }).build();
        server.start();
    }
}

Mar 12, 2019 3:38:10 AM org.xnio.Xnio <clinit>
INFO: XNIO version 3.3.8.Final
Mar 12, 2019 3:38:10 AM org.xnio.nio.NioXnio <clinit>
INFO: XNIO NIO Implementation Version 3.3.8.Final

 HttpHandler handle404Example = new HttpHandler() {
  @Override
  public void handleRequest(HttpServerExchange exchange) throws Exception {
   exchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
   exchange.getResponseSender().send("File Not Found");
  }
 };


 ResourceHandler resourceHandler = new ResourceHandler(
                 new PathResourceManager(Paths.get(System.getProperty("user.home")), 100), handle404Example)
                 .setDirectoryListingEnabled(true);
 RequestDumpingHandler requestDumpingHandler = new RequestDumpingHandler(resourceHandler);
 Undertow server = Undertow.builder()
                 .addHttpListener(8080, "localhost")
                 .setHandler(path(Handlers.path()
                 .addPrefixPath("/", requestDumpingHandler)))
                 .build();
 server.start();

   RoutingHandler routes = new RoutingHandler().get("/users", new HttpHandler() {
           public void handleRequest(HttpServerExchange httpServerExchange) throws Exception {
                 httpServerExchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
                 httpServerExchange.getResponseSender().send(users.toString());
            }
    })
       .post("/users", new RequestDumpingHandler(new HttpHandler() {
            public void handleRequest(HttpServerExchange httpServerExchange) throws Exception {
                 FormParserFactory.Builder builder = FormParserFactory.builder();

                 final FormDataParser formDataParser = builder.build().createParser(httpServerExchange);

                if (formDataParser != null) {
                     FormData formData = formDataParser.parseBlocking();
                     Integer id = Integer.parseInt(formData.get("id").peek().getValue());
                     User user1 = new User(id, formData.get("name").peek().getValue());
                     formDataParser.close();
                     users.add(user1);
                     httpServerExchange.getResponseHeaders().put(Headers.CONTENT_TYPE, "text/plain");
                     httpServerExchange.getResponseSender().send("added successfully");
               }

       }
   }));


  Undertow undertow = Undertow.builder()
                     .addHttpListener(8080, "localhost")
                     .setHandler(routes).build();
 
 undertow.start();

  $ java -jar undertow-examples.jar
     Welcome to the Undertow Examples
     Please select an example:
     a) Basic Authentication
     b) Chat
     c) File Serving
     d) HTTP2
     e) Hello World
     f) JSR Web Sockets
     g) ModCluster Proxy Server
     h) Reverse Proxy
     i) Server Sent Events
     j) Servlet
    k) Session Handling
    l) Web Socket Extensions
   m) Web Sockets