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Learn about Spring Boot 4's major architectural change through modularization of auto-configuration in this 11-minute tutorial video. Discover why the H2 Console disappears after upgrading from Spring Boot 3.x to 4.0 and how to resolve this common migration issue. Explore how Spring Boot's monolithic auto-configure jar, which grew from 185KB to over 2MB, has been split into smaller, focused modules to improve application size and clarity. Understand the difference between raw dependencies and starter dependencies, and learn how to fix the H2 Console issue using the new Spring Boot H2 Console starter. Get introduced to the Spring Boot Auto Configure Classic escape hatch option for gradual migration and find out where to locate documentation on all the new modular starters. Access the Spring Boot 4 Migration Guide, Road to GA Blog Series, and GitHub repository examples to support your upgrade process.
