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 https://www.youtube.com/watch?v=nQ4B_EWnAvI&list=PL3NrzZBjk6m-jblxwCFWxtvCeYGv05rmj ⚡ Reactive Java with Project Reactor (Full Series) https://www.youtube.com/watch?v=-AnAd7rR2Qk&list=PL3NrzZBjk6m-RrIn2ndllgEnIHpOmz2v3 👉 Watch here 🔁 Generics in Java Explained 👉 Watch here https://www.youtube.com/watch?v=V-Sg8K4oINU&list=PL3NrzZBjk6m8BqPhWC700B1TnG9XUlLdT 🌐 Spring Boot Crash Course 👉 Watch here https://www.youtube.com/watch?v=F_rGkDeihBg&list=PL3NrzZBjk6m-P7k8tmq1wJOdJ0_ZpPxbp What is content Negotitiation? https://www.youtube.com/watch?v=GL4OWv_7k5o&t=28s 🎯 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 For More free/paid courses visit www.seleniumexpress.com 📚 More in‑depth playlists & courses from Selenium Express: ▶️ Spring Core https://www.youtube.com/watch?v=r2Q0Jzl2qMQ&list=PL3NrzZBjk6m-nYX072dSaGfyCJ59Q5TEi ▶️ Spring MVC (Beginner) https://www.youtube.com/watch?v=zCHrZdJODg4&list=PL3NrzZBjk6m-OSeL3DRMD_ISa0u-9c1l1 ▶️ Spring MVC (Intermediate) https://www.youtube.com/watch?v=40YaLHbrwrY&list=PL3NrzZBjk6m_2jw8sC0BkEwSPFHxgQDWr ▶️ Spring JDBC https://www.youtube.com/watch?v=5j_vh1b9dV8&list=PL3NrzZBjk6m-rYTKze-5Y5RvU8eykal4j ▶️ Spring Live Project (End‑to‑End) https://www.youtube.com/watch?v=m_b_FwDjAXM&list=PL3NrzZBjk6m-9CVPueDLLermojwtfuW_f ▶️ Spring Security https://www.youtube.com/watch?v=f0Qsst3hwpQ&list=PL3NrzZBjk6m8pmxjh4i9mF_K-c5mcGuqt ▶️ Spring Boot Microservices https://www.youtube.com/watch?v=T2rBkbT50TE&list=PL3NrzZBjk6m_n8QZCdnF7Yax36cqWkO9j ▶️ Spring Boot Project Build https://www.youtube.com/watch?v=yohGxGYg3t4&list=PL3NrzZBjk6m-JSUXdch7Pk5UMllaanjvs ▶️ Apache Kafka Essentials https://www.youtube.com/watch?v=MkcrLzbu9tc&list=PL3NrzZBjk6m_dQzvBuD6Yn9Tj9xNTmyhl ▶️ Spring Bootcamp (FREE) https://www.youtube.com/watch?v=ZTv6uQ2AlA8&list=PL3NrzZBjk6m_7F2vyEW8DWmUTmnkb_IS3 ▶️ Spring Data https://www.youtube.com/watch?v=y7MZTqzyg5Q&list=PL3NrzZBjk6m_IRkm1uCgf2ufvkQGstJfw ▶️ Spring Data JPA — Entity Mapping https://www.youtube.com/watch?v=na0k_fEmFvw&list=PL3NrzZBjk6m-XiX22zxJYJd6CYzmNENUI ▶️ Spring Live Mock Interview https://www.youtube.com/watch?v=yX2w-Sof95s&list=PL3NrzZBjk6m_Md4nG1uF5113-Z0yVRoA0 Any time you are getting stuck with issues, Feel free to ask for support. Email me at [email protected] Facebook https://www.facebook.com/seleniumexpress Facebook support Group “SeleniumExpress - Support" https://www.facebook.com/groups/187000222361579/ Follow me on Insta https://www.instagram.com/selenium_express/