Merge branch 'master' into BAEL-16633

libraries-http/src/main/java/com/baeldung/javalin/JavalinApp.java

@@ -0,0 +1,16 @@
+package com.baeldung.javalin;
+
+import com.baeldung.javalin.User.UserController;
+import io.javalin.Javalin;
+
+public class JavalinApp {
+    public static void main(String[] args) {
+        Javalin app = Javalin.create()
+                .port(7000)
+                .start();
+
+        app.get("/hello", ctx -> ctx.html("Hello, Javalin!"));
+        app.get("/users", UserController.fetchAllUsernames);
+        app.get("/users/:id", UserController.fetchById);
+    }
+}