What's new in Spring Boot 4

A discovery hub for exploring new features in Spring Boot 4 and Spring Framework 7. Each feature has its own dedicated repository with complete implementations, tutorials, and documentation.

Features

Feature	Description	Details
Null Safety	JSpecify annotations for compile-time null safety	Package-level @NullMarked annotation
HTTP Interface Clients	Declarative HTTP clients with @HttpExchange	Replace RestTemplate/WebClient boilerplate
Bean Registration	Programmatic bean registration	BeanRegistrar interface
API Versioning	First-class API versioning support	Media type parameter versioning
JMS Client	JMS messaging with Apache Artemis	Producer/Consumer patterns
Resilience	Built-in resilience without external dependencies	@Retryable and @ConcurrencyLimit
Jackson 3	Jackson 3 JSON processing support	ISO-8601 defaults, hint() method, JSON Views
REST Test Client	Unified REST API testing	One API for unit, integration, and E2E tests
MockMvcTester vs RestTestClient	Comparing controller testing approaches	Side-by-side examples and decision guide
Spring Data AOT	Ahead-of-time repository compilation	50-70% faster startup, compile-time validation
OpenTelemetry	Official observability starter	Auto-instrumentation, log correlation, OTLP export
Spring Security MFA	Multi-factor authentication with Spring Security 7	@EnableMultiFactorAuthentication with OTT
Auto-Configuration	Modular auto-configuration changes	Migration from Spring Boot 3.x

Resources

• Spring Initilialzr
• The Road to GA
• Spring Framework 7 Reference Documentation
• Spring Boot 4 Reference Documentation
• Spring Framework 7 Release Notes
• Spring Boot 4 Release Notes

About

This repository serves as an index to find detailed implementations and tutorials for Spring Boot 4 features. Click on any feature above to find links to:

• Dedicated GitHub repositories with code
• Video tutorials
• Blog posts
• Official documentation

Author

Dan Vega

• Website: danvega.dev
• YouTube: @danvega
• GitHub: @danvega
• Twitter: @danvega