Inside Spring Boot 4: Restructuring for the Future by Moritz Halbritter @ Spring I/O 2026

This talk focuses on the key changes and technical advancements in Spring Boot 4.0, emphasizing the behind-the-scenes refinements crucial for maintaining production systems. The speaker discusses the significant cleanup of the dependency tree, enhanced modularization of auto-configurations, and how these improvements lead to a leaner, more predictable framework that supports new features. The session also examines the use of JSpecify to address nullability issues, the implications of transitioning to Jackson 3.0 for the web layer, and the advancements in HTTP service client support. Attendees will gain valuable insights that will aid them in confidently navigating the migration to Spring Boot 4.0.