Upgrading to Spring Boot 4: Lessons From an AI-First Migration

What made our Spring Boot 3.5 to 4.1 upgrade easier than the 2 to 3 one, including the AI-first knowledge base we built and shared across service teams.

Spring Boot 4 Migration Analysis

A detailed analysis of the major changes in Spring Boot 4, including Jackson 3 migration, Java 17 baseline, and dependency updates.

Modified: August 8, 2026 · Created: January 19, 2026 · João Vieira (JV) · Software Engineering