Why Spring Boot 3’s Shift to Java 17 Matters for Your Backend Projects

What to do?

Upgrading to a new version is only meaningful when there is a real need; otherwise it’s unnecessary work.

Two situations make an upgrade worthwhile: intense competition pushes version upgrades onto your task list, or you fall far behind the community and feel compelled to catch up.

What changes?

Spring Boot 3 aligns with Java 17, uses Spring 6, and updates build tools to Maven 3.5 and Gradle 7.3. The default version manager switches to Gradle, which may download slower in China.

Jakarta EE moves to version 9, renaming packages from javax to jakarta. Most enterprises still rely on legacy Java EE features, but the shift is inevitable.

Several outdated components are removed, including Apache ActiveMQ, Atomikos, EhCache 2, Hazelcast 3, and others. The removed items are now provided as separate starters rather than core packages.

EhCache 3

H2’s web console

Hibernate’s metrics

Infinispan

Jolokia

Pooled JMS

REST Assured

Is it scary?

Spring Boot 3 is currently in the M1 milestone; a new M2 milestone is expected on March 24.

Most developers fear neither the lack of updates nor unstable new features; the real concern is being stuck between an outdated version and a bleeding‑edge one.

Maintain a clean system and avoid unnecessary extensions to prevent future pain.