This repository contains exercise solutions and hands-on labs for a comprehensive Reactive Spring training course.

A 5-hour intensive workshop teaching reactive programming with Spring Boot, Spring WebFlux, and Project Reactor through practical exercises covering:

• REST Clients: RestClient, WebClient, and HTTP Interfaces
• Reactive Data Access: Spring Data R2DBC with H2 database
• Reactive Web Programming: Both annotated controllers and functional approaches
• Testing: Comprehensive test coverage with WebTestClient and StepVerifier
• Schedulers: Thread management and handling blocking operations

reactive-spring/
├── labs.md                    # Complete lab exercises and instructions
├── slides.md                  # Slidev presentation (35 slides, 5-hour course)
├── restclient/               # REST client examples and solutions
│   ├── RestClient            # Modern synchronous HTTP access
│   ├── WebClient             # Reactive HTTP access
│   └── HTTP Interfaces       # Spring 6+ declarative clients
└── reactive-customers/       # Reactive Spring Data + WebFlux
    ├── Annotated Controllers # Traditional @RestController approach
    ├── Functional Programming # RouterFunction approach  
    ├── R2DBC Integration     # Reactive database access
    └── Comprehensive Tests   # WebTestClient and repository tests

• Spring Boot 3.5.3 - Latest stable release
• Spring WebFlux - Reactive web framework
• Spring Data R2DBC - Reactive database access
• Project Reactor - Reactive streams implementation
• H2 Database - In-memory database for examples
• JUnit 5 - Testing framework
• Gradle 8.14.2 - Build tool

• Java 17 or later
• IDE with Spring Boot support (IntelliJ IDEA, Eclipse, VS Code)

1. Clone the repository

   git clone <repository-url>
   cd reactive-spring

2. Build all projects

   ./gradlew build

3. Run individual projects

   # REST client examples
   ./gradlew :restclient:bootRun
   
   # Reactive customers application
   ./gradlew :reactive-customers:bootRun

4. Run tests

   # All tests
   ./gradlew test
   
   # Specific project tests
   ./gradlew :reactive-customers:test

1. View the presentation - slides.md (use Slidev or any Markdown viewer)
2. Follow the labs - labs.md contains complete step-by-step exercises
3. Check the solutions - Working implementations in each project
4. Run the tests - See reactive programming patterns in action
5. Experiment - Modify code and observe reactive behavior

The labs.md file contains detailed exercises covering:

1. Building a REST Client - RestClient basics and JSON parsing
2. Asynchronous Access - WebClient and reactive streams
3. HTTP Interfaces - Spring 6+ declarative HTTP clients
4. Project Reactor Tutorial - Flux and Mono fundamentals
5. Working with Schedulers - Thread management and blocking operations
6. Reactive Spring Data - R2DBC and reactive repositories
7. Annotated Controllers - Traditional Spring MVC style with reactive types
8. Functional Web Programming - RouterFunction and handler-based approach (Optional)

• Understand reactive programming concepts and benefits
• Master Project Reactor's Flux and Mono types
• Build reactive REST clients using multiple approaches
• Control thread execution with schedulers for blocking operations
• Implement reactive data access with R2DBC
• Create reactive web endpoints using both programming models
• Write effective tests for reactive applications
• Handle backpressure and reactive stream lifecycle

This repository represents a complete, production-ready example of reactive Spring applications with:

• ✅ 100% test coverage - All examples include comprehensive tests
• ✅ Latest Spring Boot - Uses current stable releases and best practices
• ✅ Multiple approaches - Demonstrates both traditional and functional styles
• ✅ Real-world patterns - Includes error handling, testing, and configuration
• ✅ Clean architecture - Well-organized, documented, and maintainable code

• slides.md - Complete 35-slide Slidev presentation covering reactive concepts
• View with Slidev: npx @slidev/cli slides.md
• Includes course overview, testing tools, and progressive reveal animations
• Or open in any Markdown viewer for reference

• Spring WebFlux Documentation
• Project Reactor Documentation
• Spring Data R2DBC Reference
• Reactive Streams Specification
• Slidev Documentation - For presentation framework

This repository is designed for hands-on learning. Follow the labs, explore the code, run the tests, and experiment with reactive programming concepts to master Spring's reactive stack.