Learn Spring Boot 4 in just 30 minutes with this fast, practical crash course. In this tutorial, you’ll explore the newest features in Spring Boot 4, build a real REST API, learn API versioning, register beans using the new API, call external APIs with @HttpExchange, and use built-in resilience features all from scratch.
Spring Boot 4 brings major improvements like:
- Java 25 support + Java 17 compatibility
- Modularized codebase with smaller, focused JARs
- JSpecify null-safety across the portfolio
- First-class API versioning
- New HTTP Service Clients (@HttpExchange, @GetExchange)
- Modern bean registration API
- Virtual thread support
- Built-in resilience and retry mechanisms
Are you excited about the new features?