spring-projects/spring-boot v2.4.0-M4 on GitHub

⭐ New Features

Improve ConfigData processing code #23711
Apply FailureAnalyzers even if the ApplicationContext was not created #23710
Set platform API version when invoking image builder #23682
Align name of UndertowServletWebServerFactory's eagerInitFilters with Undertow's naming #23674
Add KafkaStream's CleanupConfig properties #23636
Add a FailureAnalyzer for ConfigDataNotFoundException #23633
Update default builder image for image builds with buildpacks #23628
Override Undertow's defaults so that the request URL of a forwarded request is spec-compliant and make it configurable via an application property #23619
Use a Property named mainClass to configure the main class name in the Gradle plugin #23608
Remove org.synchronoss.cloud:nio-multipart-parser from spring-boot-starter-webflux in favour of WebFlux's own parser #23601
Address inconsistencies in enabling configuration properties #23593
Add configuration properties for Flyway 7.0's new configuration options #23579
Use JdbcTransactionManager in favor of DatasourceTransactionManager #23572
Deprecate HSQL in EmbeddedDatabaseConnection and add HSQLDB as its preferred replacement #23565
Add configuration option to configure RabbitConnectionFactory's channelRpcTimeout #23564
Avoid resolving configurations unnecessarily when building a layered jar #23528
Add BootstrapContext methods that deal with missing registrations #23438
Configure the bootBuildInfo task lazily #23435
When building with Gradle, include project dependencies in the application layer by default and make it easer to customise their location #23431
Allow users to define their own LocaleContextResolver bean when using WebFlux #23419
Add support for Oracle UCP #23403
Configure Docker host in build plugins #23400
Allow to create a custom RestTemplateBuilder whilst retaining default auto-configuration #23389
Don't apply MeterFilter to auto-configured composite registry #23381
Add configuration option to customize RSocketServer's fragment size #23247
Improve CassandraHealthIndicator with more robust mechanism #23041
Allow binding to collections when a boolean 'is' method also exists #23007
Stop registering the default servlet by default #22915
Add support for Redis 6 authentication with username #22702
Expose cache metrics for RedisCache #22701
Configure ApplicationContext's ResourceLoader on RabbitConnectionFactory #22332
Add origin support for empty YAML list and map #21704
Add support for publishing docker images to a registry #21001
Add support for Hazelcast 4 #20856

🪲 Bug Fixes

Setting server.undertow.eager-filter-init has no effect #23677
@ConfigurationPropertiesBinding does not apply Formatter beans #23615
spring-boot-configuration-processor prevents builds from being incremental when source retention annotations are present #23580
H2 Console error with AbstractRoutingDataSource #23570
When using embedded Jetty, an error response to a HEAD request has a body #23557
Custom layer definition does not pick up snapshots #23541
Datasource initialisation with JPA schema configured in deferred mode happens asynchronously #23535
Dependency management for Netty tcNative does not include its netty-tcnative module #23509
PropertiesLauncher requires spring-core on the classpath #23501
Log4j's tag library doesn't work out of the box as log4j-*.jar is skipped by default #23482
DataSourceBuilder should only alias a property when the expected DataSource is configured #23480
Unexpected application context cache hit when testing with SpringBootTest webEnvironment MOCK and DEFINED_PORT #23478
Log4j2 configuration is not picking up some properties #23430
Flyway configuration ignores init-sqls when using spring.datasource.* properties #23409
Kubernetes configmap hidden files are exposed as property sources #23232

📔 Documentation

Fix XML tag in image publishing example #23632
Document that @DataNeo4jTest does not support transactional tests with a reactive setup #23630
Document that a reactive transaction manager is not auto-configured with Spring Data Neo4j #23629
Document how JAVA_OPTS can be used with the buildpack #23626
Add example of default Cloud Native Buildpacks Builder #23623
Add upgrading section to reference docs with a link to the wiki #23612
Add example of setting system property in gradle bootRun #23599
Fix typos in reference documentation and contributing guidelines #23573
Update configuration metadata appendix to remove description for Gradle 4.5 and earlier as it is no longer supported #23568
Provide both properties and YAML for each configuration properties example #23515
Add reference to desensitization spring boot starter #23507
Fix typos #23465
Fix link to Log4j's JDK Logging Adapter in reference documentation #23462
Fix typo #23456
Revisit hint on using classpath* for retrieving templates #23453
Note the Kt class name suffix when describing how to configure a Kotlin application's main class name #23423
Add anchor links to section headers in Gradle and Maven plugin reference docs #23407

🔨 Dependency Upgrades

Upgrade to Byte Buddy 1.10.17 #23639
Upgrade to Caffeine 2.8.6 #23640
Upgrade to Commons DBCP2 2.8.0 #23641
Upgrade to Couchbase Client 3.0.9 #23642
Upgrade to Dropwizard Metrics 4.1.13 #23643
Upgrade to Elasticsearch 7.9.2 #23644
Upgrade to Flyway 7.0.2 #23645
Upgrade to Hazelcast 4.0.3 #23475
Upgrade to Hazelcast Hibernate5 2.1.1 #23476
Upgrade to Hibernate 5.4.22.Final #23646
Upgrade to Hibernate Validator 6.1.6.Final #23647
Upgrade to HtmlUnit 2.44.0 #23648
Upgrade to HttpClient 4.5.13 #23649
Upgrade to Infinispan 11.0.4.Final #23650
Upgrade to Jackson Bom 2.11.3 #23651
Upgrade to Jersey 2.32 #23652
Upgrade to Jetty 9.4.32.v20200930 #23653
Upgrade to jOOQ 3.13.5 #23654
Upgrade to JUnit 4.13.1 #23655
Upgrade to Kotlin 1.4.10 #23656
Upgrade to Kotlin Coroutines 1.4.0-M1 #23678
Upgrade to Lettuce 6.0.0.RELEASE #23657
Upgrade to Liquibase 3.10.3 #23658
Upgrade to Lombok 1.18.14 #23659
Upgrade to MariaDB 2.7.0 #23660
Upgrade to Mockito 3.5.13 #23661
Upgrade to OAuth2 OIDC SDK 8.22 #23673
Upgrade to Postgresql 42.2.17 #23662
Upgrade to QueryDSL 4.4.0 #23663
Upgrade to Reactor 2020.0.0-RC2 #23621
Upgrade to RSocket 1.1.0-RC1 #23637
Upgrade to RxJava2 2.2.20 #23664
Upgrade to Selenium HtmlUnit 2.44.0 #23665
Upgrade to SendGrid 4.6.6 #23666
Upgrade to Spring AMQP 2.3.0-RC1 #23680
Upgrade to Spring Data 2020.0.0-RC2 #23594
Upgrade to Spring Framework 5.3.0-RC2 #23534
Upgrade to Spring Integration 5.4.0-RC1 #23695
Upgrade to Spring Kafka 2.6.2 #23679
Upgrade to Spring Security 5.4.1 #23667
Upgrade to Tomcat 9.0.39 #23668
Upgrade to Undertow 2.2.2.Final #23669

❤️ Contributors

We'd like to thank all the contributors who worked on this release!