v6.1.0-M1

⭐ New Features

• Consistent simple value type check (including UUID treatment for data binding) #30664
• Release shared JMS Connection when message listener container is stopped #30612
• Property-driven onRefresh checkpoint during application context bootstrap #30606
• Support letters other than A-Z in identifiers in SpEL expressions #30580
• Remove System.out calls in PreComputeFieldFeature #30571
• Have the ErrorResponse.Builder take in a custom ProblemDetail instance #30568
• Allow setting the ProblemDetail.type via a MessageSource #30566
• ClientHttpRequestFactory based on Jetty HttpClient #30564
• Remove buffering in ClientHttpRequestFactory implementations #30557
• Support JAXBElement in Jaxb2XmlEncoder #30552
• Disable SpEL selector support in WebSocket messaging by default #30550
• Enforce JPA bootstrap failure for incomplete Hibernate Validator setup #30549
• Support parsing long dates in InstantFormatter #30546
• Port BeanPropertyRowMapper and DataClassRowMapper for r2dbc #30530
• Add non-null precondition checks in DefaultEntityResponseBuilder #30433
• Deprecate spring-context-indexer #30431
• Update RuntimeHintsAgentPlugin to use the native image code path #30422
• HTTP interface client should not have blockingTimeout set and leave it to the underlying client by default #30403
• Improve toString() for Profiles.of() implementation #30374
• Add ReloadableResourceBundleMessageSource Resource selection hook #30369
• Optimize DefaultLifecycleProcessor::stopBeans #30361
• Deprecate AutowireCapableBeanFactory.createBean(Class, int, boolean) for consistent usage of createBean(Class) #30345
• Support setCharacterEncoding(null) in MockHttpServletResponse #30341
• Add support for converting a String to an Instant #30312
• Refine RouterFunctionMapping ordering consistency #30278
• CRaC Resource adapter for bean lifecycle in application context #30242
• Configuration options for virtual threads #30241
• Support for SequencedCollection/Set/Map #30239
• MethodArgumentNotValidException::errorsToStringList should include only the resolved message when MessageSource is used #30198
• Support @XmlSeeAlso in Jaxb2XmlDecoder #30167
• Add SpEL support for registered MethodHandles #30045
• Add test support to record async events, with JUnit Jupiter caveat #30020
• Returning a CompletableFuture.failure() from an async, transactional method should mark the transaction as roll back #30018
• Support @Scheduled on Reactive methods and Kotlin suspending functions #29924
• Compatibility with JVM checkpoint restore (OpenJDK's Project CRaC) #29921
• Validator factory methods with BiConsumer #29890
• Spring MVC and WebFlux method validation support that also adapts ConstraintViolations #29825
• Remove LocalVariableTableParameterNameDiscoverer #29559
• Avoid use of java.net.URL constructors #29481
• Creating relative resource for URL resource should create relative Resource even if relative path has URL in it #28522
• ModelAttributeMethodArgumentResolver does not support custom field binding for immutable objects #28284
• ConcurrentTaskScheduler and ConcurrentTaskExecutor can create an executor with no way to shut it down #27914
• R2DBC ConnectionFactory bean .close() method should be called/subscribed when available #26991
• org.springframework.web.servlet.mvc.method.annotation.ReactiveTypeHandler does not handle vendor-specific application/x-ndjson media types #26817
• Improve the experience of handling validation errors in controller methods #26219
• Compatibility with virtual threads (OpenJDK's Project Loom) #23443
• Avoid repeated attempts to load a failing ApplicationContext in the TestContext framework [SPR-9548] #14182

🐞 Bug Fixes

• Retain profiles used when running AOT #30421
• Automatic context propagation stops working after an error occurs #30013

📔 Documentation

• Introduce JVM checkpoint/restore support documentation #30647
• Fix link in Javadoc of PassThroughFilterChain #30365
• Clarify behavior of the Elvis SpEL operator in documentation #30352
• Fix link to releases feed #30340

🔨 Dependency Upgrades

• Upgrade to Jackson 2.15 #30665
• Upgrade to Kotlin 1.8 #29754
• Upgrade to Kotlin Coroutines 1.7 #30514
• Upgrade to Kotlin Serialization 1.5 #30515
• Upgrade to SnakeYAML 2.0 #30048

❤️ Contributors

Thank you to all the contributors who worked on this release:

@OlgaMaciaszek, @RemusRD, @aooohan, @asomov, @izeye, @jstansel, @kzander91, @luohongtu, @making, @rwinch, and @srivatsa-cfp