Spring Boot 2.5.0 RC1 Release Notes

For changes in earlier milestones, please refer to:

Upgrading from Spring Boot 2.4

DataSource Initialization

spring.datasource. properties related to DataSource initialization have been deprecated in favour of new spring.sql.init. properties that can also be used to initialise an SQL database accessed via R2DBC.

The new script-based SQL database initialization does not support using separate credentials for schema (DDL) and data (DML) changes. This reduces complexity and aligns its capabilities with Flyway and Liquibase. If you require separate credentials for schema and data initialization, define your own org.springframework.jdbc.datasource.init.DataSourceInitializer beans.

Minimum requirements changes

Projects built with Gradle now require Gradle 6.8 or later.

New and Noteworthy

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

Actuator Endpoint for Quartz

A /quartz endpoint has been added to Actuator. It provides detailed information about Quartz jobs and triggers. Please see the relevant section of the Actuator’s API documentation for further details.

Database Initialization with R2DBC

Support for script-based initialization of an SQL database accessed via R2DBC has been added. By default, scripts on the classpath named schema.sql and data.sql will be applied to the database automatically. The initialization can be customized using the spring.sql.init.* configuration properties. Please see the reference documentation for further details.

Metrics for Spring Data Repositories

Actuator will now generate Micrometer metrics for Spring Data repositories. By default, metrics are named spring.data.repository.invocations. To learn more, please see the relevant section of the reference documentation.

@Timed Metrics with WebFlux

Aligning its capabilities with those of Spring MVC, @Timed can now be used to manually enable timing of requests handled by WebFlux controllers and functional handlers. To use manual timing, set management.metrics.web.server.request.autotime.enabled to false.

MongoDB Metrics

When using Actuator, metrics for Mongo’s connection pool and commands sent by the client are now generated automatically. To learn more about MongoDB metrics, please see the relevant section of the reference documentation.

HTTP/2 over TCP (h2c)

All four embedded web containers now support HTTP/2 over TCP (h2c) without any manual customization. To enable h2c, set server.http2.enabled is true and leave server.ssl.enabled set to false (its default value).

Abstract Routing DataSource Health

Actuator’s health endpoint now shows the health of the targets of an AbstractRoutingDataSource. Each target DataSource is named using its routing key. As before, to ignore routing data sources in the health endpoint, set management.health.db.ignore-routing-data-sources to true.

Gradle 7.x support

Spring Boot’s Gradle plugin now supports Gradle 7.x. Gradle 6.8.x is also supported.

Dependency Upgrades

Spring Boot 2.5 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:

Kotlin 1.5.0-RC
Elasticsearch 7.12

Miscellaneous

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

When Spring Security is on the classpath, configuration properties can now be bound to RSAPublicKey and RSAPrivateKey.
The RabbitMQ ConnectionFactory used by Spring AMQP can now be customized using a ConnectionFactoryCustomizer bean.
Embedded database auto-configured can now be controlled using the new spring.datasource.embedded-database-connection configuration property. It can be set to any of the values of EmbeddedDatabaseConnection, including none to disable embedded database auto-configured entirely.
CloudPlatform can now automatically detect Azure App Service.
server.tomcat.keep-alive-timeout can be used to configure how long Tomcat will wait for another request before closing a keep-alive connection.
server.tomcat.max-keep-alive-requests can be used to control the maximum number of requests that can be made on a keep-alive connection before it is closed.
spring.webflux.session.cookie.same-site can be used to configure WebFlux’s SameSite cookie policy. It is lax by default.
Apache HttpClient 5 is now auto-configured for use with WebClient.
A new ApplicationEnvironment class has been introduced which should improve a small performance boost.
You can now configure Netty memory using the spring.netty.leak-detection property.

Deprecations in Spring Boot 2.5.0 RC1

ActuatorMediaType and ApiVersion in org.springframework.boot.actuate.endpoint.http in favor of equivalents in org.springframework.boot.actuate.endpoint