What’s New in Spring Boot 3.0? Key Changes and Migration Tips

Some Known Changes

To keep up with the evolving ecosystem, developers should be aware of several important changes in Spring Boot 3.0.

Removal of Deprecated APIs from Spring Boot 2.x

Classes, methods, and properties deprecated in Spring Boot 2.x will be removed in the 3.0 release.

Minimum Java Requirement

Spring Boot 3.0 requires Java 17 as the minimum version; Java 8 is no longer supported. By the time the final version is released, Java 19 is expected to be available.

Jakarta EE 9 Upgrade

Spring Boot now depends on Jakarta EE 9, adopting Servlet 5.0 and JPA 3.0 specifications. Third‑party libraries that do not support these specifications will be reduced or removed. Libraries such as EhCache3, Jersey, JOOQ, and Thymeleaf will be dropped until they adapt to Jakarta EE 9.

Permanent Removal of Support

Apache ActiveMQ

Atomikos

EhCache 2

Dependency Upgrades

Spring Boot 3.0 upgrades several Spring dependencies, including Spring Security 6.0-M1 , and moves Jakarta EE related modules to Jakarta EE 9.

Final Personal Recommendations

Chasing the newest features blindly is unwise, but clinging to old versions indefinitely is also problematic. While using stable releases for daily development, developers should build a bridge toward new architectures and concepts, ensuring continuous learning and extending their professional longevity.

In short, clearly define your investment and expected returns.

Reference

Spring Boot 3.0 M1 Release Notes