Spring Boot 2.3.0 M2 Release Notes

For changes in earlier milestones, please refer to:

v2.3.0 M1

Upgrading from Spring Boot 2.2

See instructions in the 2.3.0.M1 release notes for upgrading from Spring Boot 2.2.

MongoDB

This release switches to MongoDB 4 and harmonizes the reactive and imperative drivers. This should be pretty transparent to you if you’re using the starter.

ApplicationContextRunner disables bean overriding by default

For consistency with SpringApplication, ApplicationContextRunner now disables bean overriding by default. If you need to use bean overriding for a test, withAllowBeanDefinitionOverriding can be used to enable it.

Neo4j open session in view disabled by default

The open session in view interceptor for Neo4j is now disabled by default. If you need to enable it again, use the standard spring.data.neo4j.open-in-view property.

New and noteworthy

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

Support of wildcard locations for configuration files

Spring Boot now supports wildcard locations when loading configuration files. By default, a wildcard location of config/*/ outside of your jar is supported. This is useful in an environment such as Kubernetes when there are multiple sources of config properties. For instance, if you have separate mysql and redis configurations, they can be picked automatically if you place them in /config, i.e. /config/mysql/application.properties and /config/redis/application.properties.

Improvements to OCI image generation feature

We’ve improved the OCI image generation feature introduced in Spring Boot 2.3.0.M1:

Added support for generating images on Microsoft Windows
Changed the Docker API version requirement (2.14+) so that older version can be used too.
Improved the documentation for generating images with the Gradle and Maven plugins.
Fixed a number of issues raised by early testers. Thank you for the feedback.