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Explore the major changes brought by Jackson 3 support in Spring Framework 7 and Spring Boot 4 through this comprehensive 34-minute tutorial. Learn how Jackson 2 and Jackson 3 coexist in Spring Boot 4 for maximum compatibility while discovering the powerful new JsonMapper that replaces the mutable ObjectMapper. Understand critical package changes from com.fasterxml.jackson to tools.jackson and why Jackson 3's switch to unchecked exceptions improves Lambda compatibility. Build a practical Donut Shop application to demonstrate key concepts including JSON Views implementation for controlling serialization on both server and client sides. Master the immutable configuration approach with JsonMapper's builder pattern that provides thread-safe operations, navigate the new tools.jackson package structure, and adapt to Jackson 3's default ISO string format for date serialization instead of timestamps. Discover how unchecked exceptions eliminate boilerplate code in modern Java development and implement selective field serialization for different API consumers using JSON Views. The tutorial covers creating projects with Spring Boot 4, building DataLoaders with JsonMapper, implementing client-side JSON Views with RestClient, troubleshooting Spring Boot 4 modularity issues, and provides essential migration tips for transitioning from Jackson 2 to Jackson 3.
