What's Changed

New Features 🎉

• Add StreamingFileUpload.asInputStream by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/9787
• Add DefaultHttpClient constructor with ssl builder by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/9875
• Facilitate troubleshooting with trace logging for health check results when endpoints.health.details-visible is unavailable. by @wetted in https://github.com/micronaut-projects/micronaut-core/pull/9895
• Respect @Format annotation for fields passed as http request body arguments by @oujesky in https://github.com/micronaut-projects/micronaut-core/pull/9883
• feat: dispatch OPTIONS requests by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/10011
• Implement zealous block detection for HttpClient by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/10010

KSP

• KSP: skip ExecutableVisitor warning for default parameters by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9833
• KSP: Implement annotation defaults retrieval by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9786
• KSP: performance improvements by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9832

Bug Fixes 🐞

• Add alias annotations before the stereotypes by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9942

Improvements ⭐

• Polish DefaultMutableConversionService by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9744
• Performance optimizations by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9701
• imp: build route with a media type other than JSON by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/9756
• Performance improvement and cleanup of PropertySourcePropertyResolver by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9766
• Changing Jakarta provide to BeanProvider as it's lazy by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9779
• Fix processing order of introduced method in Java by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9784
• Small bean context optimizations by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9788
• Correct how maps/sets are initialized with a correct size by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9834
• Improve default annotation values by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9838
• Support generating source files by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9960
• Improve usability of @Mapper annotation by @graemerocher in https://github.com/micronaut-projects/micronaut-core/pull/9980
• Replace DEFAULT_EVENT_LOOP_THREADS with a lazy getter by @yawkat in https://github.com/micronaut-projects/micronaut-core/pull/9815
• Bind form values as an array to simplify deserialization by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/10070
• Remove unused imports by @altro3 in https://github.com/micronaut-projects/micronaut-core/pull/10039
• Add BinaryTypeConfiguration by @timyates in https://github.com/micronaut-projects/micronaut-core/pull/9530
• AST: Support resolving the class element represented by GenericElement by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9757
• Another HTTP filters refactoring by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9722
• Skip calling containsBean for io.micronaut.context.BeanProvider by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9768
• Implement enum constant in kotlin element factory by @altro3 in https://github.com/micronaut-projects/micronaut-core/pull/9774
• Conversion service improvements by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9770
• Improve bean qualifiers by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9778
• Add missing @Override annotations by @altro3 in https://github.com/micronaut-projects/micronaut-core/pull/10040
• change comment copy by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/10103
• imp: avoid name shadowning of result by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/10101
• Text proofreading by @altro3 in https://github.com/micronaut-projects/micronaut-core/pull/10038
• imp: Exception 'java.io.IOException' is never thrown in the method by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/10102
• Checkstyle fixes. Remove tests conditions for JDK version less 17 by @altro3 in https://github.com/micronaut-projects/micronaut-core/pull/10045

Tests ✅

• Fix frequent CI failures of MDCReactorSpec by @jeremyg484 in https://github.com/micronaut-projects/micronaut-core/pull/10031
• Add tests clarifying annotations on hidden methods by @dstepanov in https://github.com/micronaut-projects/micronaut-core/pull/9821
• test: set explicitely WRITE_IN_METAINF=false by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/9792
• Move old tests from JUnit4 to JUnit Jupiter by @altro3 in https://github.com/micronaut-projects/micronaut-core/pull/10041
• tck: RequestUriTest by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/9986

Docs 📖

• docs: how to use the Micronaut ResourceLoader API with example using ResourceResolver by @wetted in https://github.com/micronaut-projects/micronaut-core/pull/10054
• Fixes in adoc format by @altro3 in https://github.com/micronaut-projects/micronaut-core/pull/10037
• docs: fix broken, stale, and deprecated links in user guide by @wetted in https://github.com/micronaut-projects/micronaut-core/pull/9819
• Clarify how to return text-plain responses for answers others than Strings by @wetted in https://github.com/micronaut-projects/micronaut-core/pull/9911
• Docs: Update reference field name in explaination by @dnyaneshwar2023 in https://github.com/micronaut-projects/micronaut-core/pull/10093

Dependency updates 🚀

• fix(deps): update dependency com.fasterxml.jackson.core:jackson-databind to v2.15.3 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/9988
• fix(deps): update netty monorepo to v4.1.101.final by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10097
• fix(deps): update managed.jackson to v2.15.3 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/9997
• fix(deps): update asm to v9.6 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10047
• chore(deps): update plugin me.champeau.jmh to v0.7.2 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10043
• fix(deps): update dependency com.squareup.okio:okio to v3.6.0 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10064
• fix(deps): update dependency io.netty.incubator:netty-incubator-codec-http3 to v0.0.22.final by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10081
• fix(deps): update dependency com.github.javaparser:javaparser-symbol-solver-core to v3.25.6 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10057
• Merge branch '4.1.x' into '4.2.x' by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/10099

Kotlin

• Update Kotlin to 1.9.20 by @timyates in https://github.com/micronaut-projects/micronaut-core/pull/10059
• Update kotlin to 1.9.10 by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/9793

Micronaut Modules

Micronaut AWS

• fix(deps): update dependency io.micronaut.aws:micronaut-aws-bom to v4.1.1 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10065

Micronaut Groovy

• fix(deps): update dependency io.micronaut.groovy:micronaut-runtime-groovy to v4.1.0 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10088

Micronaut Reactor

• build: Reactor 3.5.11 and Micronaut Reactor 3.0.3 by @sdelamo in https://github.com/micronaut-projects/micronaut-core/pull/9966
• fix(deps): update dependency io.micronaut.reactor:micronaut-reactor-bom to v3.0.4 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10015

CI ⚙️Build 🐘

• Use the current JDK for testing, but 17 for building by @timyates in https://github.com/micronaut-projects/micronaut-core/pull/9989
• Add Java 21 by @timyates in https://github.com/micronaut-projects/micronaut-core/pull/9978
• Fix develocity badge by @timyates in https://github.com/micronaut-projects/micronaut-core/pull/9996

GraalVM

• chore(deps): update graalvm/setup-graalvm action to v1.1.5 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10063
• chore(deps): update dependency org.graalvm.buildtools.native:org.graalvm.buildtools.native.gradle.plugin to v0.9.28 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10002

Micronaut Build Plugin

• chore(deps): update plugin io.micronaut.build.shared.settings to v6.5.7 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/9976
• chore(deps): update dependency io.micronaut.build.internal:micronaut-gradle-plugins to v6.6.0 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10033
• chore(deps): update dependency io.micronaut.build.internal:micronaut-gradle-plugins to v6.6.1 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/10105

SVM

• fix(deps): update dependency org.graalvm.nativeimage:svm to v23.1.1 by @renovate in https://github.com/micronaut-projects/micronaut-core/pull/9625

New Contributors

• @dnyaneshwar2023 made their first contribution in https://github.com/micronaut-projects/micronaut-core/pull/10093

Full Changelog: https://github.com/micronaut-projects/micronaut-core/compare/v4.1.12...v4.2.0