8 Best Reactive Programming Courses On Udemy (2025)

Reactive programming is a powerful paradigm that allows you to write efficient, asynchronous, and event-driven code, making it ideal for building modern, scalable applications.

It leverages the concept of data streams, enabling you to handle events and data changes in a non-blocking and responsive manner.

Mastering reactive programming can unlock exciting opportunities in areas like web development, microservices, and data processing, equipping you to build performant applications that gracefully handle complexity and concurrency.

Finding a good reactive programming course on Udemy can be a daunting task.

You’re looking for a course that is comprehensive, engaging, and taught by experts, but also fits your learning style and goals.

With so many options available, it’s easy to feel overwhelmed and unsure where to start.

For the best reactive programming course overall on Udemy, we recommend Reactive Angular Course (with RxJs, Angular 17).

This course provides a comprehensive introduction to reactive programming with Angular and RxJS, covering everything from basic concepts to advanced techniques.

You’ll learn how to leverage RxJS operators to build efficient, observable-based services, manage state reactively, and optimize component interactions.

The course also includes hands-on projects and real-world examples, allowing you to solidify your understanding and apply your knowledge in practical scenarios.

While this is our top pick, there are other great options available on Udemy, focusing on different languages and frameworks, like Java and Spring.

Keep reading to discover a range of courses tailored to your specific learning needs and career goals.

Reactive Angular Course (with RxJs, Angular 17)

You’ll start by reviewing a traditional imperative-style component and understanding its potential problems.

Then, you’ll dive into the stateless observable-based services design pattern, learning how to consume these services using the async pipe and avoid duplicate HTTP requests with shareReplay.

The course also explores reactive component interaction, teaching you how to decouple communication using shared services, custom observables, and behavior subjects.

You’ll implement loading and error handling services reactively, and even learn about local error handling in Angular Material dialogs.

As you progress, you’ll gain insights into Angular state management and build a store service step-by-step, including optimistic data modification operations.

The authentication state management section covers implementing an authentication store, adapting the UI based on user status, and supporting browser refreshes with local storage.

The master-detail UI pattern is a highlight, where you’ll build a complete implementation with built-in state management.

Additionally, the single data observable pattern is introduced, and you’ll refactor an application to use OnPush change detection.

The instructor’s clear explanations and step-by-step implementations make it easy to follow along and understand the concepts.

Build Reactive MicroServices using Spring WebFlux/SpringBoot

You’ll start by grasping the fundamentals of reactive programming, exploring its benefits and core concepts like Reactive Streams and Project Reactor.

Project Reactor, a Java library for reactive programming, will be your tool for creating and manipulating reactive streams using Flux and Mono.

Next, you’ll dive into building reactive REST APIs with Spring WebFlux, mastering RestController and @WebFluxTest for robust testing.

You’ll learn to handle diverse scenarios, including creating infinite streams using Server-Sent Events (SSE), integrating with MongoDB for data persistence, and utilizing ResponseEntity for dynamic response status adjustments.

The course takes you beyond the basics, introducing the functional web module in Spring WebFlux for a more declarative approach to API development.

You’ll become proficient in exception handling with GlobalErrorHandler and implement bean validation using ControllerAdvice.

Finally, you’ll put your knowledge into practice by building real-world microservices.

You’ll learn to connect multiple services using Spring WebClient, a non-blocking HTTP client ideal for reactive applications.

You’ll tackle network exceptions, simulate errors using WireMock, and master retry strategies with backoff mechanisms.

The course also covers Server-Sent Events (SSE) and Sinks for building streaming endpoints.

You’ll have gained hands-on experience with essential concepts like Flux, Mono, WebClient, ReactiveMongoRepository, and ResponseEntity.

You’ll also master error handling techniques and implement robust validation practices.

Mastering Java Reactive Programming [ From Scratch - 2024 ]

This course provides a comprehensive deep dive into the world of Java reactive programming.

You’ll start by building a solid foundation in the core concepts, exploring the fundamentals of processes, threads, CPUs, and RAM.

You’ll learn about different IO models and how reactive programming offers a modern, efficient approach to handling data streams.

The course breaks down the Reactive Streams Specification, guiding you through the publisher/subscriber communication pattern.

You’ll then dive into the practical applications of reactive programming with the powerful Mono and Flux classes.

You’ll learn to create, manipulate, and consume reactive data streams using a variety of operators like just, empty, error, defer, and more.

The course explores external services and teaches you how to build non-blocking IO clients using Netty for high performance.

Throughout the course, you’ll gain hands-on experience through code examples, demos, and assignments.

The course emphasizes best practices, including error handling, using operators like timeout, switchIfEmpty, and defaultIfEmpty.

You’ll also learn about hot and cold publishers, and how to manage them effectively using tools like refCount and autoConnect.

The course dives into threading and schedulers, teaching you how to customize the execution of reactive streams.

You’ll learn to use subscribeOn and publishOn to control thread allocation for maximum performance.

You’ll also learn about back pressure and overflow strategies to ensure your reactive applications are resilient and handle high-volume data streams effectively.

You’ll explore powerful combination operators like concatWith, merge, zip, and flatMap, allowing you to manipulate data streams in innovative ways.

You’ll also learn how to batch, window, and group data using operators like buffer, window, and groupBy.

The course covers techniques for repeating and retrying operations, which are crucial for handling unreliable data sources.

Finally, you’ll learn about sinks, enabling you to handle output from reactive streams.

You’ll explore different sink types like Unicast, Multicast, and Replay, and learn how to manage them effectively.

The course dives into the concept of context, showing you how to propagate and manage data throughout your reactive applications.

The course offers a wealth of resources like source code and Maven dependencies, making learning both engaging and efficient.

You’ll also gain practical experience through assignments and quizzes, reinforcing your knowledge.

The course provides guidance on unit testing, including the use of Step Verifier for reactive streams.

You’ll be well-prepared to design and build robust, scalable, and efficient applications using the power of Java reactive programming.

Functional & Reactive programming in Java : Modern Style

This course offers a comprehensive exploration of functional and reactive programming in Java, equipping you with the skills to write modern, efficient, and maintainable code.

You’ll begin by mastering the fundamentals of functional programming, learning why it’s beneficial and how it contrasts with traditional imperative programming.

The course provides a clear explanation of lambdas and functional interfaces, essential concepts in Java 8 and beyond.

You’ll delve into predefined functional interfaces like Predicate, Consumer, Supplier, and Function, and practice writing your own lambdas with various signatures.

You’ll also master the use of method and constructor references, streamlining your code further.

The course then delves into the heart of functional programming, exploring key concepts like pure functions, higher-order functions, and referential transparency.

You’ll learn to design APIs in a functional style and discover how functional techniques enhance common design patterns like Iterator, Strategy, Decorator, and Factory Method.

A substantial portion of the course focuses on Java Streams and Parallel Streams, showing you how to create, filter, map, and reduce streams, and the difference between stateful and stateless operations.

You’ll even learn to create custom spliterators to process data more efficiently.

The course goes deeper with advanced stream processing techniques using Collectors, and teaches you how to create your own custom collectors.

Next, you’ll dive into Reactive Programming, a powerful paradigm for handling asynchronous and event-driven code elegantly.

You’ll understand the Reactive Manifesto and discover how RxJava solves common issues like callback hell and concurrency.

You’ll learn to work with Observables and Observers, master various RxJava operators, and utilize RxJava for concurrency and parallelism.

The course covers advanced topics like subjects, replaying, caching, buffering, throttling, and switching.

The final section focuses on Flowable and BackPressure, showing you how to implement reactive streams with backpressure using Flowable and Subscriber.

This course provides a solid foundation in functional and reactive programming, equipping you with the skills to write modern and efficient Java code.

Reactive Programming with Spring Framework 5

This course offers a comprehensive deep dive into the world of reactive programming within the Spring Framework 5.

You’ll not only understand the core concepts of reactive programming and the Reactive Manifesto, but also gain practical experience building high-performance, scalable applications.

Key highlights include:

• Spring WebFlux Mastery: You’ll master Spring WebFlux, a powerful framework for building reactive web applications.

The course includes practical examples using WebTestClient for testing your applications, ensuring you can build robust and reliable code.

• Relational Database Integration: Learn how to seamlessly integrate Spring Data R2DBC, enabling you to leverage relational databases within a reactive paradigm.

This will empower you to build complex applications that seamlessly handle data interactions.

• Functional Programming Fundamentals: The course provides a solid foundation in functional programming, a paradigm that emphasizes immutability and side-effect-free functions.

This knowledge will help you write cleaner, more maintainable code and avoid common pitfalls.

You’ll also gain hands-on experience with technologies like Netty, MongoDB, and RabbitMQ, showcasing how these tools integrate within the Spring ecosystem.

The course’s practical approach includes real-world examples, allowing you to apply your knowledge to build real-world applications.

Spring WebFlux Masterclass: Reactive Microservices [2024]

This course is a comprehensive dive into the world of reactive programming with Spring WebFlux, equipping you to build modern, scalable, and resilient microservices.

You’ll start by understanding the fundamental differences between traditional and reactive APIs and how reactive programming can dramatically enhance performance and efficiency.

The course then takes you step-by-step through setting up projects with Spring Data R2DBC, a powerful tool for working with databases in a reactive way.

You’ll learn how to perform CRUD operations on your data using reactive data sources like R2DBC, building a solid foundation for your microservices.

You’ll go beyond the basics, exploring pagination and complex queries to efficiently manage large datasets.

Next, you’ll delve into the design and implementation of reactive CRUD APIs using Spring WebFlux.

You’ll master techniques like error handling and validation, learning how to build secure and reliable APIs with features like WebFilters for authentication and authorization.

The course then guides you towards more advanced topics like functional endpoints, where you’ll learn to define your APIs in a declarative and concise way.

You’ll also explore the power of WebClient, a non-blocking HTTP client, to interact with external services and build robust integrations within your microservices architecture.

Finally, the course culminates in a comprehensive final project.

You’ll build a trading platform, putting into practice all the knowledge and skills acquired throughout the course.

You’ll learn how to implement complex logic, handle real-time data streams, and effectively manage concurrency and performance.

This course is a valuable resource for developers looking to embrace the benefits of reactive programming and build modern, efficient, and scalable microservices.

The combination of practical exercises and real-world examples will leave you well-equipped to tackle complex projects in the world of reactive programming.

Reactive Programming in Modern Java using Project Reactor

This course provides a comprehensive exploration of reactive programming in Java, specifically using Project Reactor.

You’ll gain a deep understanding of the “why” behind reactive programming and its advantages in modern application development.

The course starts by introducing the fundamental concepts of reactive streams and introducing you to the key building blocks: Flux and Mono.

You’ll learn how to create your first Flux and Mono, and discover a variety of operators to manipulate and transform them.

One of the strengths of this course is its focus on the integration of functional programming principles into reactive programming with Project Reactor.

You’ll delve into essential operators like map, filter, and flatMap, learning how to work with asynchronous operations and manage empty data gracefully.

The course culminates in the practical application of these concepts by building a full-fledged MovieReactiveService, showcasing how to combine various reactive streams using concat, merge, and zip.

You’ll then delve into robust error handling techniques, exploring operators like onErrorReturn, onErrorResume, and onErrorMap to effectively manage exceptions.

You’ll also discover methods for retrying and repeating sequences using retry, retryWhen, and repeat operators.

The course provides a thorough understanding of Reactor’s execution model, explaining how Schedulers, Threads, and Threadpools work, and how to switch threads using publishOn and subscribeOn.

Moving beyond the fundamentals, you’ll be introduced to the concept of backpressure and learn how to handle it effectively using operators such as onBackpressureDrop, onBackpressureBuffer, and onBackpressureError.

The course also explores data parallelism in Project Reactor, highlighting how operators like parallel, runOn, and flatMapSequential can be used for efficient processing.

You’ll learn the difference between cold and hot streams, exploring ConnectableFlux and its various applications.

This course goes beyond theory by guiding you in building a non-blocking REST client using WebClient.

You’ll use StepVerifier and JUnit for testing, ensuring the efficiency and reliability of your code.

You’ll learn to create Flux and Mono programmatically using various methods like generate, create, and handle, giving you complete control over data manipulation.

Finally, the course addresses the importance of debugging in Project Reactor, teaching you how to effectively use hooks, checkpoint operators, and the production-ready ReactorDebugAgent for efficient debugging.

Learn Vert.x - Reactive microservices with Java

This comprehensive course empowers you to build reactive microservices using Vert.x and Java.

You’ll embark on a journey that starts with the fundamentals of Vert.x Core, introducing you to its core concepts and guiding you through the creation of your first application.

You’ll delve into the heart of Vert.x by exploring Verticles, the building blocks of Vert.x applications.

Learn how to scale and configure these components effectively, harnessing the power of Vert.x’s architecture.

The course then unveils the Event Bus, a versatile tool for enabling seamless communication between your Verticles.

Get hands-on experience with Vert.x Futures and Promises, essential tools for navigating the asynchronous world of modern programming.

Discover the power of Vert.x Launcher for live redeployments and master the art of packaging and deploying your applications using Docker.

Next, you’ll dive into the realm of Vert.x Web, learning how to craft REST APIs with ease.

Explore routing, request handling, and error handling techniques, all while leveraging Project Lombok to streamline your code.

You’ll venture into the world of reactive SQL clients, learning how to seamlessly connect to and interact with PostgreSQL and MySQL databases using Vert.x.

Discover the benefits of Flyway, a powerful tool for managing database schema migrations, and explore PgPool, a robust solution for database connection pooling.

Then, you’ll delve into Vert.x Reactive with Mutiny, a reactive programming library, and see how it integrates seamlessly with Vert.x Core, Vert.x Web, and Vert.x Reactive clients.

You’ll also explore the exciting world of integrating Vert.x with Quarkus, a popular framework for building microservices.

Finally, you’ll delve into the realm of Vert.x Web Sockets and build real-time applications with this powerful technology.

This course leaves no stone unturned, providing you with the skills and knowledge necessary to create robust and scalable microservices using Vert.x.

You’ll gain a deep understanding of Vert.x’s core concepts and master its powerful features to build applications that are both efficient and performant.