What’s New in Spring Boot 3.0.0 M1? Key Changes and Migration Tips

On January 20, 2022, the Spring team released the first milestone (M1) of Spring Boot 3.0.0.

Key changes include:

Java baseline upgraded from Java 8 to Java 17

Java 17 is now the baseline, encouraging developers to migrate.

Migration from Java EE APIs to Jakarta EE

All Java EE APIs have been moved to Jakarta EE. Imports must replace javax with jakarta, e.g., javax.servlet.Filter becomes jakarta.servlet.Filter. Some third‑party libraries that still depend on Java EE APIs (e.g., EhCache 3, Infinispan, Jolokia, Pooled JMS) are temporarily removed.

Removed support for certain components

The following components are no longer supported in this milestone:

Apache ActiveMQ

Atomikos

EhCache 2

Hazelcast 3

Dependency upgrades

Spring projects now depend on newer versions:

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 libraries also received updates, such as Artemis 2.20.0, Hazelcast 5.0, Hibernate Validator 7.0, and various Jakarta components (Activation, Annotation, JMS, JSON, Mail, Persistence, Servlet, etc.).

Future plans

The Spring Boot team plans to release a new milestone every two months; M2 is expected on March 24, and the GA version is slated for late November 2022.

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