Spring Boot 4.2.0 M1 Release Notes

Spring Boot 4.2.0-M1 Release Notes

Upgrading from Spring Boot 4.1

Deprecations from Spring Boot 4.1

Classes, methods and properties that were deprecated in Spring Boot 4.1 have been removed in this release. Please ensure that you aren’t calling deprecated methods before upgrading.

Harmonization of Sets and Maps in Configuration Properties

Configuration properties that are shipped by Spring Boot now use the same implementation as the binder for consistency. Binding to those types now keeps the order specified in the configuration file consistently.

You may be impacted if you were relying on the order by reading the raw Set or Map.

Minimum Requirements Changes

New and Noteworthy

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

Dependency Upgrades

Spring Boot 4.2.0-M1 moves to new versions of several Spring projects:

• …​

Numerous third-party dependencies have also been updated, some of the more noteworthy of which are the following:

• …​

Miscellaneous

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

• ApplicationHome and ApplicationTemp exposes convenient java.nio.file.Path.

Deprecations in Spring Boot 4.2.0-M1