Update examples/logging/log4j to use Nima (helidon-io#6861)

* Update examples/logging/log4j to use Nima

Signed-off-by: aserkes <andrii.serkes@oracle.com>

Author: aserkes

examples/logging/log4j/README.md

@@ -22,12 +22,11 @@ java -jar target/helidon-examples-logging-log4j.jar
 
 Expected output should be similar to the following:
 ```text
-2020-11-19 15:44:48,561 main INFO Registered Log4j as the java.util.logging.LogManager.
 15:44:48.596 INFO  [main] io.helidon.examples.logging.log4j.Main - Starting up "startup"
-15:44:48.598 INFO  [main] io.helidon.examples.logging.log4j.Main - Using JUL logger "startup"
+15:44:48.598 INFO  [main] io.helidon.examples.logging.log4j.Main - Using System logger "startup"
 15:44:48.600 INFO  [pool-2-thread-1] io.helidon.examples.logging.log4j.Main - Running on another thread "propagated"
-15:44:48.704 INFO  [features-thread] io.helidon.common.features.HelidonFeatures - Helidon SE 2.2.0 features: [Config, WebServer] ""
-15:44:48.801 INFO  [nioEventLoopGroup-2-1] io.helidon.reactive.webserver.NettyWebServer - Channel '@default' started: [id: 0xa215c23d, L:/0:0:0:0:0:0:0:0:8080] ""
+15:44:48.704 INFO  [features-thread] io.helidon.common.features.HelidonFeatures - Helidon NIMA 4.0.0-SNAPSHOT features: [Config, Encoding, Media, WebServer] ""
+15:44:48.801 INFO  [main] io.helidon.nima.webserver.LoomServer - Started all channels in 12 milliseconds. 746 milliseconds since JVM startup. Java 20.0.1+9-29 "propagated"
 ```
 
 # Running as native image

examples/logging/log4j/pom.xml

@@ -41,8 +41,8 @@
 
     <dependencies>
         <dependency>
-            <groupId>io.helidon.reactive.webserver</groupId>
-            <artifactId>helidon-reactive-webserver</artifactId>
+            <groupId>io.helidon.nima.webserver</groupId>
+            <artifactId>helidon-nima-webserver</artifactId>
         </dependency>
         <dependency>
             <groupId>io.helidon.logging</groupId>

examples/logging/log4j/src/main/java/io/helidon/examples/logging/log4j/Main.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2020, 2022 Oracle and/or its affiliates.
+ * Copyright (c) 2020, 2023 Oracle and/or its affiliates.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -19,14 +19,13 @@
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
-import java.util.concurrent.TimeUnit;
 
 import io.helidon.common.context.Context;
 import io.helidon.common.context.Contexts;
 import io.helidon.logging.common.HelidonMdc;
 import io.helidon.logging.common.LogConfig;
-import io.helidon.reactive.webserver.Routing;
-import io.helidon.reactive.webserver.WebServer;
+import io.helidon.nima.webserver.WebServer;
+import io.helidon.nima.webserver.http.HttpRouting;
 
 import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.LogManager;
@@ -68,18 +67,17 @@ public static void main(String[] args) {
         // done by the webserver
         Contexts.runInContext(Context.create(), Main::logging);
 
-        WebServer.builder()
-                .routing(Routing.builder()
-                                 .get("/", (req, res) -> {
-                                     HelidonMdc.set("name", String.valueOf(req.requestId()));
-                                     logger.info("Running in webserver, id:");
-                                     res.send("Hello");
-                                 })
-                                 .build())
-                .port(8080)
-                .build()
-                .start()
-                .await(10, TimeUnit.SECONDS);
+        WebServer server = WebServer.builder()
+                .routing(Main::routing)
+                .start();
+    }
+
+    private static void routing(HttpRouting.Builder routing) {
+        routing.get("/", (req, res) -> {
+            HelidonMdc.set("name", String.valueOf(req.id()));
+            logger.info("Running in webserver, id:");
+            res.send("Hello");
+        });
     }
 
     private static void logging() {