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Spring Boot 3.0.0 M3 Release Notes
We have moved the properties controlling the actuator metrics export. The old schema was management.metrics.export.<product>, the new one is management.<product>.metrics.export (Example: the prometheus properties moved from management.metrics.export.prometheus to management.prometheus.metrics.export). If you are using the spring-boot-properties-migrator, you will get notified at startup. See #30381 for details.
When building an application with Gradle, resolution of the name of the application’s main class has been simplified and made consistent.
bootJar, bootRun, and bootWar now all resolve the name of the main class name by looking for it in the output of the main source set.
This removes a small risk that the tasks may not have used the same main class name by default.
If you were relying on the main class being resolved from a location outside of the main source set’s output, update your Gradle configuration to configure the main class name using the mainClass property of the springBoot DSL:
springBoot {
mainClass = "com.example.Application"
}
Alternatively, you can configure the classpath property of the resolveMainClassName task to search in locations other than the main source set’s output directories.
The fork attribute of spring-boot:run and spring-boot:start that was deprecated in Spring Boot 2.7 has been removed.
Support for properties under spring.security.saml2.relyingparty.registration.{id}.identity-provider have been removed. Use the new properties under spring.security.saml2.relyingparty.registration.{id}.asserting-party as a replacement.
Auto-configuration and dependency management for Flapdoodle embedded MongoDB has been removed. If you are using embedded MongoDB for testing, use the auto-configuration library provided by the Flapdoodle project or modify the tests to use the Testcontainers project instead of embedded MongoDB.
The default format for the date and time component of log messages for Logback and Log4j2 has changed to align with the ISO-8601 standard.
The new default format yyyy-MM-dd’T’HH:mm:ss.SSSXXX uses a T to separate the date and time instead of a space character and adds the timezone offset to the end. The LOG_DATEFORMAT_PATTERN environment variable or logging.pattern.dateformat property can be used to restore the previous default value of yyyy-MM-dd HH:mm:ss.SSS.
Support for Apache Solr has been removed as its Jetty-based client, Http2SolrClient, is not compatible with Jetty 11.
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Tip
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Check the configuration changelog for a complete overview of the changes in configuration. |
With its 5.0 release, REST Assured is compatible with Jakarta EE 9 and Groovy 4.0. As a result, support has been reinstated.
With its 5.0 release, Pooled JMS is compatible with Jakarta EE 9. As a result, support has been reinstated and can be used with Apache Artemis by setting spring.artemis.pool.enabled to true.
Spring Boot now auto-configures an instance of ObservationRegistry for you. If micrometer-core is on the classpath, a TimerObservationHandler is registered on the ObservationRegistry, which means that every stopped Observation leads to a timer. ObservationPredicate, GlobalTagsProvider and ObservationHandler are automatically registered on the ObservationRegistry. You can use ObservationRegistryCustomizer to further customize the ObservationRegistry if you need to. See #29666 for details.
Spring Boot now auto-configures Micrometer Tracing for you. This includes support for Brave, OpenTelemetry, Zipkin and Wavefront. When using the Micrometer Observation API, finishing observations will lead to spans reported to Zipkin or Wavefront. Tracing can be controlled with properties under management.tracing. Zipkin can be configured with management.zipkin.tracing, while Wavefront uses management.wavefront. To use, for example Wavefront with Brave, these dependencies are needed:
implementation 'org.springframework.boot:spring-boot-starter-actuator' implementation 'io.micrometer:micrometer-tracing-bridge-brave' implementation 'io.micrometer:micrometer-tracing-reporter-wavefront'
See the documentation (TBD) for more details.
An OtlpMeterRegistry is now auto-configured when io.micrometer:micrometer-registry-otlp is on the classpath.
The meter registry can be configured using management.otlp.metrics.export.* properties.
A new configuration property, spring.kafka.listener.async-acks, for enabling async acks with Kafka has been added.
To enable async acks, set the property to true.
The property only applies when spring.kafka.listener.async-mode is set to manual or manual-immediate.
Spring Boot 3.0.0-M3 moves to new versions of several Spring projects:
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TBD
Numerous third-party dependencies have also been updated, some of the more noteworthy of which are the following:
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REST Assured 5.0
Apart from the changes listed above, there have also been some minor tweaks and improvements including:
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Bean Validation
Configurationcan now be customised by defining aValidationConfigurationCustomizerbean. -
Log4j2’s
Log4jBridgeHandleris now used to route JUL-based logging into Log4j2 rather than routing through SLF4J.