What’s New in Spring Boot 3.0.0 M1? Key Changes and Upgrade Guide

Java baseline upgraded from Java 8 to Java 17

The milestone announces that Java 17 will become the baseline for Spring Boot 3, signaling the shift to the next‑generation LTS version.

From Java EE APIs to Jakarta EE

All Java EE APIs have been moved to Jakarta EE; imports must be changed from javax.* to jakarta.*. Some third‑party libraries that still depend on Java EE (e.g., EhCache 3, Infinispan, Jolokia, Pooled JMS) are temporarily removed until Jakarta‑compatible versions are released.

Removed support for certain components

The M1 release drops support for the following features compared with the previous SNAPSHOT:

Apache ActiveMQ

Atomikos

EhCache 2

Hazelcast 3

Dependency upgrades

Key Spring project versions in this milestone include:

Micrometer 2.0.0‑M1

Spring AMQP 3.0.0‑M1

Spring Batch 5.0.0‑M1

Spring Data 2022.0.0‑M1

Spring Framework 6.0.0‑M2

Spring Integration 6.0.0‑M1

Spring HATEOAS 2.0.0‑M1

Spring Kafka 3.0.0‑M1

Spring LDAP 3.0.0‑M1

Spring REST Docs 3.0.0‑M1

Spring Security 6.0.0‑M1

Spring Session 2022.0.0‑M1

Spring Web Services 4.0.0‑M1

Third‑party library versions include:

Artemis 2.20.0

Hazelcast 5.0

Hibernate Validator 7.0

Various Jakarta APIs (Activation, Annotation, JMS, JSON, JSON‑Bind, Mail, Persistence, Servlet, Servlet JSP JSTL, Transaction, Validation, WebSocket, WS RS, XML Bind, XML Soap) all at version 2.0 or 3.0 as appropriate

Jetty 11

jOOQ 3.16

Tomcat 10

Future plans

The Spring Boot team will release a new milestone every two months; M2 is expected on March 24, and the GA version is slated for late November.

Reference https://spring.io/blog/2022/01/20/spring-boot-3-0-0-m1-is-now-available