Spring Boot 4.0.0 M1 Release Notes

Spring Boot 4.0.0-M1 Release Notes

Upgrading from Spring Boot 3.5

Minimum Requirements Changes

None.

New and Noteworthy

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

Configuration Properties Metadata for External Types

It is now possible for @ConfigurationProperties-annotated types to refer to types that are located in a different module. To source the metadata for those module, you should add the annotation processor (if necessary) and flag the type with @ConfigurationPRopertiesSource.

See the reference documentation for more details.

Dependency Upgrades

Spring Boot 4.0.0-M1 moves to new versions of several Spring projects:

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

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Miscellaneous

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

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Deprecations in Spring Boot 4.0.0-M1

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