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Spring WebFlux Masterclass: High-Performance Reactive APIs (Udemy.com)

Build 10x Faster, Scalable Spring Boot WebFlux Microservices: Non-Blocking I/O, R2DBC, WebClient, HTTP/2, Streaming

4.8
1,920 reviews

Created by: Vinoth Selvaraj

Last updated September 2026

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What you will learn

  • Master Spring WebFlux: Learn how to build modern, scalable, and responsive web applications using Spring WebFlux.
  • Embrace Reactive Programming: Understand the benefits of reactive programming for building efficient and scalable applications.
  • Leverage R2DBC: Learn how to use R2DBC for reactive data access and improve application performance.
  • Achieving High Performance & Scalability With HTTP2
  • Build Reactive Controllers: Create reactive controllers with Spring WebFlux annotations and handle requests and responses efficiently.
  • Implement Error Handling: Learn effective error handling strategies for a robust user experience.
  • Use WebFilters for Pre-processing and Post-processing: Chain WebFilters for complex logic and share data effectively.
  • Implement Streaming: Learn how to implement client-side and server-side streaming for optimized data transfer.

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Quality Score

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Overall Score : 96 / 100

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Course Description

The course project is up to date Spring Boot 4.0

This Masterclass is the practical, complete guide to Spring WebFlux. You will master Non-Blocking I/O techniques, leveraging Reactive Programming principles, to build highly scalable and resilient microservices. The core focus is on maximizing performance and throughput by eliminating thread blocking. Learn advanced Spring Boot and Spring WebFlux skills including R2DBC for reactive data access, and HTTP/2 Streaming for optimal inter-service communication. This course delivers the expertise needed to transform your enterprise architecture for high-concurrency demands.

What You Will Master: Core Skills & Performance

Every module is designed to provide you with an immediate, high-value, and actionable skill:

  • Reactive vs. Traditional APIs: Understand the architectural shift from blocking to Non-Blocking I/O. Master the fundamental differences between Traditional APIs and Reactive APIs for maximum scalability.

  • Reactive Data Access & Benchmarking (R2DBC): Implement non-blocking data access using R2DBC drivers and Spring Data R2DBC repositories. Benchmark and prove the throughput and resource efficiency of R2DBC against Spring Data JPA.

  • Reactive Controller Development: Master creating reactive controllers, handling requests and responses using Flux/Mono, and validating logic using the dedicated WebTestClient tool.

  • Advanced Error Handling: Discover techniques for managing exceptions within reactive pipelines. Implement strategies to return meaningful, consistent error responses for a robust user experience.

  • WebFilter Chaining & Cross-Cutting Concerns: Explore how to implement and chain multiple WebFilters for complex logic. Master pre-processing and post-processing requests and effectively share data across the reactive flow.

  • Functional Programming in WebFlux: Leverage the power of lambda expressions to write concise, readable code. Build controllers using the modern functional endpoints (Router Functions) pattern.

  • Building Non-Blocking Clients (WebClient): Learn to use WebClient to consume external APIs asynchronously using reactive streams. Handle asynchronous responses efficiently in a truly non-blocking manner.

  • Streaming & Real-Time Data: Implement client-side and server-side data streaming for large file transfers using WebClient. Master backpressure handling for optimized performance. Enable real-time updates using Server-Sent Events (SSE) with Spring WebFlux.

  • Optimizing for Performance (Microservice Communication): Implement Gzip compression for maximum bandwidth savings. Configure HTTP connection pooling to reduce connection overhead. Leverage HTTP/2 protocol and multiplexing for efficient concurrent communication.

  • Integration Testing Mastery: Master end-to-end testing with WebTestClient, embedding rigorous testing practices throughout the entire course.

By the end of this course, you will be the expert ready to build modern, high-throughput, and scalable Spring WebFlux microservices that maximize resource efficiency under load.
Read More All Levels All Levels product length iconTime: 13.3h

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Instructor Details

Vinoth Selvaraj

I am a Principal Engineer with certifications as an AWS Certified Solutions Architect Associate, Certified Kubernetes Application Developer, and Google Cloud Engineer. I am passionate about software development, with a focus on building scalable, high-performance distributed systems and modern AI-powered applications.

My areas of interest include Java, Spring, Agentic AI, AI Agents, MCP (Model Context Protocol), Observability, Cloud Computing, and Distributed System Design. I enjoy simplifying complex engineering topics and creating practical, industry-focused courses for developers.

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Reviews

4.8

1,920 ratings on Udemy

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By Mohit Kumar on 1/13/2026

This course explains reactive programming and Spring WebFlux in a very clear and practical way. The concepts like non-blocking I/O, Mono/Flux, R2DBC, and reactive streams are broken down step by step with real-world examples, which makes a complex topic much easier to understand. It really helped me shift my mindset from traditional Spring MVC to reactive programming. Highly recommended for anyone working with modern Spring microservices!

By Amrit Anand Bhandari on 9/21/2025

Good coverage of Spring Webflux. Covers all the areas needed to get started. If you are new to Reactive Programming highly recommend doing the 1st course in the series "Mastering Java Reactive Programming [ From Scratch ]", it will help in making this course much more understandable.

By Mikhail Sokolov on 6/18/2025

This course is very good at showing practical use for reactive programming. I highly recommend this course if you have completed (or are well familiar with) reactive programming - it shows how it can be applied in an actual application.

By Gabriel Garcia Garrido on 7/17/2024

It will be perfect course if it would include things of normal spring boot that in reactive way are difficult to handle as: MDC, security context, distributed tracing in reactive way (since there are no thread context), aspects in reactive way. But in general, the course is super good

By Manickaraj Murugesan on 12/9/2023

I have taken Spring Webflux course after Vinoth's React programming from Scratch. Spring Webflux course is well structure and relevant topics/contents have been thoughtfully included. The course contains variety of use cases covered. For example embedded db, docker deployed db, r2dbc, in memory db, JPA based etc. This course needs Reactive Programing knowledge as the base. Overall, thouroughly enjoyed the course

By Rafael de Queiroz Guzmán on 10/16/2022

The course is very detailed and the didactics are impeccable. You cannot take it in its entirety without having taken the Project Reactor course. Seriously, take the Project Reactor course first. You will thank me later.

By Pawan Kumar on 10/10/2022

Very Good Course, to get started with web-flux, one thing that i would like to see more is examples that shows more error handling with retry(Prod ready kind). Like when retrying you would only retry certain types of exception and design patterns/approaches around building resilient reactive web apis

By 셔널 래 on 8/14/2022

I am interested in webflux and I am enroll all of your related courses. I had to listen to it over and over again because of the different language regions, but I enjoyed taking it with the concept of realizing interest in the topic of Webflux.

By Carlo Marcello on 9/29/2021

Pretty good, content is well structured and easy to understand (provided you have some background on reactive programming and Spring REST APIs). I feel it could have had a bit more of theory (there is some) on how requests are processed and how things work under the hood. A good course nevertheless.

By Pintu Das on 5/4/2021

Reactive is the new future. This course gives you a good introduction to spring-webflux. Request you to add a section on securing reactive REST API using Reactive Spring Security. For the newbies in Reactive (eg Project Reactor) please take the Reactive Programming using Project Reactor prior to this course for making best use of this course. Thank you Vins for such an awesome course. I am great fan of you and bought every courses of your's.

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Spring WebFlux Masterclass: High-Performance Reactive APIs
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  • Video Duration: icon 13.3h
  • Price: $84.99 Track Price 11.99 Track Price
  • Provider: icon Udemy
  • Updated: icon September 2026
  • Level: All Levels All Levels
  • Language: icon English
  • Certificate: icon Yes
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