Learn Spring WebFlux Step-by-Step 🚀 | Reactive Programming in Spring Boot for Beginners

Learn Spring WebFlux Step-by-Step 🚀 | Reactive Programming in Spring Boot for Beginners

Are you ready to master Spring WebFlux? This in-depth crash course walks you through building reactive REST APIs using Spring Boot and Project Reactor — from absolute scratch. Whether you're a beginner or an experienced Spring developer, this video is the perfect entry point to the reactive world.

✅ What You’ll Learn in This Video:
🔹 The difference between Tomcat & Netty
🔹 Why non-blocking I/O matters in modern systems
🔹 Basics of Mono and Flux (Project Reactor)
🔹 How Spring WebFlux works under the hood
🔹 Functional endpoints vs traditional controllers
🔹 How to build and stream data reactively
🔹 Real-world examples using delay, logging & threading

🕒 Timestamps

00:00:00 - 🚀 Introduction to Spring WebFlux
00:01:05 - 🛠️ Setting Up the WebFlux Project from Scratch
00:03:17 - ⚙️ Why Netty? How WebFlux Differs from Tomcat
00:07:53 - 🧵 Understanding Non-Blocking I/O in Reactive Systems
00:26:11 - ⚡ Introduction to Flux in Project Reactor
00:33:15 - 🔧 Building Your First Reactive GET Endpoint
00:46:31 - 📈 Performance Benefits of Reactive Programming
00:52:47 - 📚 What is Spring WebFlux? Core Concepts
00:57:06 - ☝️ Understanding Mono (Publisher)
01:03:27 - ✍️ Writing Your First Functional Endpoint
01:06:31 - 🧩 Creating a Router Configuration
01:10:08 - 🧠 How the `route()` Method Works
01:17:17 - 🧑‍💻 Writing a HandlerFunction
01:25:18 - 🔄 Exploring RouterFunctions in Detail
01:31:27 - 📥 Writing a Request Handler for GET APIs
01:37:54 - ❓ Handling Query Parameters in WebFlux
01:46:50 - 🔀 How to Handle Multiple Requests (Routing Logic)

📚 Prerequisites (Optional but Helpful)
Basic knowledge of Spring Boot
Familiarity with Java 8+, especially Lambda & Streams
Optional: Familiarity with Reactive Java

🎓 Related Courses – For reference
📘 Java Streams & Lambda Expressions (Complete Playlist)
👉 Watch here
   • Stream API in Java : Foundation |  Java 8  

⚡ Reactive Java with Project Reactor (Full Series)
   • Reactive Programming 01 - Java Stream Vs R...  
👉 Watch here

🔁 Generics in Java Explained
👉 Watch here
   • From Beginner to Expert:  Why Java Generic...  

🌐 Spring Boot Crash Course
👉 Watch here
   • Spring Vs Spring Boot - Why Spring Boot ? ...  

What is content Negotitiation?
   • Master Rest API with Spring Boot Step By S...  


🎯 Preparing for Spring Boot or WebFlux Interviews?

This video also covers several key concepts that often come up in Spring Boot + Reactive interviews, including:

Difference between Spring MVC and WebFlux

Why Netty instead of Tomcat?

How Mono and Flux works ?

Threading and non-blocking behavior

Functional routing vs annotation-based APIs

Use this as part of your interview prep for backend Java roles in 2025!


#springboot #springwebflux #reactiveprogramming #javadevelopers #javainterviewprep #springboottutorial

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