Spring Boot 4.0.0 RC2 Release Notes

Spring Boot 4.0.0-RC2 Release Notes

For changes in earlier milestones, please refer to:

• v4.0.0-RC1

• v4.0.0-M3

• v4.0.0-M2

• v4.0.0-M1

Upgrading from Spring Boot 3.5

Migration Guide

To help with upgrading, a migration guide is available.

New and Noteworthy

Tip	Check the configuration changelog for a complete overview of the changes in configuration.

Modularization of spring-boot-micrometer-tracing

spring-boot-micrometer-tracing has been split in 3 modules. We’ve added new modules called spring-boot-micrometer-tracing-brave and spring-boot-micrometer-tracing-opentelemetry which house Brave and OpenTelemetry tracing support for Micrometer Tracing.

While working on this, we’ve also fixed some naming inconsistencies regarding properties:

• The property enabling tracing export has been changed from management.{name}.tracing.export.enabled to management.tracing.export.{name}.enabled.

• The property enabling logging export has been changed from management.{name}.logging.export.enabled to management.logging.export.{name}.enabled.

• The properties controlling logging export over OTLP have been renamed from management.opentelemetry.logging.export.* to management.opentelemetry.logging.export.otlp.*

• Zipkin properties have been renamed from management.zipkin.tracing.* to management.tracing.export.zipkin.*

Dependency Upgrades

Spring Boot 4.0.0-RC2 moves to new versions of several Spring projects:

• Spring Data Bom 2025.1.0-RC2

• Spring GraphQL 2.0.0-RC2

• Spring Framework 7.0.0-RC3

• Spring HATEOAS 3.0.0-RC2

• Spring Integration 7.0.0-RC2

• Spring Security 7.0.0-RC2

A few third-party dependencies have also been updated:

• Elasticsearch Client 9.2

Miscellaneous

Apart from the changes listed above, there have also been lots of minor tweaks and improvements including:

• Extracted OpenTelemetryLoggingAutoConfiguration from OpenTelemetrySdkAutoConfiguration.

Deprecations in Spring Boot 4.0.0-RC2

• None