⭐ New Features

• propagate scope in async failures #3957

🐞 Bug Fixes

• Random behavior in DelegatingByTypeSerializer based on type of delegates map #3974
• A constructor that fails to validate null value properly #3921

🔨 Dependency Upgrades

• Bump org.springframework.data:spring-data-bom from 2024.1.6 to 2024.1.7 #3969
• Bump io.projectreactor:reactor-bom from 2024.0.6 to 2024.0.7 #3968
• Bump org.springframework:spring-framework-bom from 6.2.7 to 6.2.8 #3967
• Bump io.micrometer:micrometer-tracing-bom from 1.4.6 to 1.4.7 #3966
• Bump com.fasterxml.jackson:jackson-bom from 2.18.4 to 2.18.4.1 #3965
• Bump io.micrometer:micrometer-bom from 1.14.7 to 1.14.8 #3964

🐞 Bug Fixes

• Random behavior in DelegatingByTypeSerializer based on type of delegates map #3976
• A constructor that fails to validate null value properly #3922

🔨 Dependency Upgrades

• Bump io.micrometer:micrometer-bom from 1.13.14 to 1.13.15 #3962
• Bump org.springframework.data:spring-data-bom from 2024.0.12 to 2024.0.13 #3961
• Bump io.micrometer:micrometer-tracing-bom from 1.3.12 to 1.3.13 #3960
• Bump io.projectreactor:reactor-bom from 2023.0.18 to 2023.0.19 #3959
• Bump org.springframework:spring-framework-bom from 6.1.20 to 6.1.21 #3958

🐞 Bug Fixes

• GH-3712: Make ContainerPausingBackOffHandler working in batch mode. #3887
• Should fail bean registration when no method listeners are registered. #3876

🔨 Dependency Upgrades

• Bump io.micrometer:micrometer-tracing-bom from 1.4.5 to 1.4.6 #3902
• Bump io.projectreactor:reactor-bom from 2024.0.5 to 2024.0.6 #3901
• Bump org.springframework:spring-framework-bom from 6.2.6 to 6.2.7 #3900
• Bump io.micrometer:micrometer-bom from 1.14.6 to 1.14.7 #3899
• Bump org.springframework.retry:spring-retry from 2.0.11 to 2.0.12 #3898
• Bump org.springframework.data:spring-data-bom from 2024.1.5 to 2024.1.6 #3897
• Bump com.fasterxml.jackson:jackson-bom from 2.18.3 to 2.18.4 #3890

⭐ New Features

• Enable the tracing on the reply of a ReplyingKafkaTemplate #3827

🐞 Bug Fixes

• GH-3712: Make ContainerPausingBackOffHandler working in batch mode. #3888
• Should fail bean registration when no method listeners are registered. #3877

🔨 Dependency Upgrades

• Bump org.springframework:spring-framework-bom from 6.1.19 to 6.1.20 #3908
• Bump io.micrometer:micrometer-tracing-bom from 1.3.11 to 1.3.12 #3907
• Bump io.micrometer:micrometer-bom from 1.13.13 to 1.13.14 #3906
• Bump io.projectreactor:reactor-bom from 2023.0.17 to 2023.0.18 #3905
• Bump org.springframework.data:spring-data-bom from 2024.0.11 to 2024.0.12 #3904
• Bump org.springframework.retry:spring-retry from 2.0.11 to 2.0.12 #3903
• Bump org.springframework.data:spring-data-bom from 2024.0.10 to 2024.0.11 #3860
• Bump org.springframework:spring-framework-bom from 6.1.18 to 6.1.19 #3858
• Bump io.micrometer:micrometer-bom from 1.13.12 to 1.13.13 #3857
• Bump io.projectreactor:reactor-bom from 2023.0.16 to 2023.0.17 #3856
• Bump io.micrometer:micrometer-tracing-bom from 1.3.10 to 1.3.11 #3855

⭐ New Features

• Verify support for the new Consumer Rebalance protocol in Spring Kafka #3847
• Upgrade Apache Kafka client dependencies to version 4.0.0 #3814
• GH-3810 Move the logging statement after the conditional statement. #3811
• Enable the tracing on the reply of a ReplyingKafkaTemplate #3808
• Optimize a MessagingMessageListenerAdapter returning null from the DelegatingInvocableHandler.invoke() #3697

🐞 Bug Fixes

• If an Error is thrown in the application's @KafkaListener listener code #3843
• KafkaOperations is missing nullable annotations #3813

📔 Documentation

• Fix plural words #3842
• Fix typo document #3824
• Update testing docs for 4.0.0 with the updates in EmbeddedKafka #3822
• Adding whats-new section for 4.0.0 #3821

🔨 Dependency Upgrades

• Bump io.projectreactor:reactor-bom from 2024.0.4 to 2024.0.5 #3859
• Bump org.jetbrains.kotlinx:kotlinx-coroutines-reactor from 1.10.1 to 1.10.2 #3836
• Bump kotlinVersion from 2.1.10 to 2.1.20 #3817

❤️ Contributors

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

@ghgh415263, @ngocnhan-tran1996, @sobychacko, and @sullis

⭐ New Features

• Enable the tracing on the reply of a ReplyingKafkaTemplate #3826

🐞 Bug Fixes

• If an Error is thrown in the application's @KafkaListener listener code #3846
• KafkaOperations is missing nullable annotations #3838

🔨 Dependency Upgrades

• Bump org.springframework.data:spring-data-bom from 2024.1.4 to 2024.1.5 #3861
• Bump io.micrometer:micrometer-tracing-bom from 1.4.4 to 1.4.5 #3854
• Bump io.micrometer:micrometer-bom from 1.14.5 to 1.14.6 #3853
• Bump io.projectreactor:reactor-bom from 2024.0.4 to 2024.0.5 #3852
• Bump org.springframework:spring-framework-bom from 6.2.5 to 6.2.6 #3851
• Bump org.springframework:spring-framework-bom from 6.2.4 to 6.2.5 #3819

⭐ New Features

• Polishing #3771
• Fix block code in section Examples #3770
• Update version antora for branch docs-build #3769
• Improve build.gradle for building antora #3768
• Improve performance of acknowledge(int index) / override createRecordList implementation #3764
• JSpecify nullability related changes #3762
• Adding jspecify nullability checks in transaction package #3738
• Add jspecify based Nullability checks in spring-kafka-test module #3737
• Configure Gradle toolchain auto-provisioning in build #3734
• Upgrade Gradle to 8.12.1 and modernize build toolchain configuration #3731

🐞 Bug Fixes

• StreamsBuilderFactoryBean fails in a native image as org.apache.kafka.streams.errors.LogAndFailProcessingExceptionHandler cannot be loaded #3787
• Kafka ProducerRecord may end up with duplicated trace headers #3786
• Fix KafkaTemplate hiding exceptions when starting observation #3779
• Handle null group id in listener observation #3778
• Fixing race condition in MicrometerMetricsTests #3760
• Metric collection for errors always report the same error "ListenerExecutionFailedException" regardless of what's thrown in the consumer method #3741
• Async suspend function listener not automatically acknowledged? #3740
• Using ConcurrentMessageListenerContainer section of reference doc is a bit confusing #3733

📔 Documentation

• Fix typo in CONTRIBUTING and README #3736

🔨 Dependency Upgrades

• Bump io.projectreactor:reactor-bom from 2024.0.3 to 2024.0.4 #3803
• Bump com.fasterxml.jackson:jackson-bom from 2.18.2 to 2.18.3 #3774

❤️ Contributors

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

@cfredri4, @ngocnhan-tran1996, and @sobychacko

⭐ New Features

• Improve performance of acknowledge(int index) / override createRecordList implementation #3767

🐞 Bug Fixes

• Kafka ProducerRecord may end up with duplicated trace headers #3791
• StreamsBuilderFactoryBean fails in a native image as org.apache.kafka.streams.errors.LogAndFailProcessingExceptionHandler cannot be loaded #3788
• Handle null group id in listener observation #3782
• Fix KafkaTemplate hiding exceptions when starting observation #3781
• Fixing race condition in MicrometerMetricsTests #3761

🔨 Dependency Upgrades

• Bump org.springframework:spring-framework-bom from 6.2.3 to 6.2.4 #3802
• Bump io.micrometer:micrometer-bom from 1.14.4 to 1.14.5 #3801
• Bump io.micrometer:micrometer-tracing-bom from 1.4.3 to 1.4.4 #3800
• Bump org.springframework.data:spring-data-bom from 2024.1.3 to 2024.1.4 #3799
• Bump io.projectreactor:reactor-bom from 2024.0.3 to 2024.0.4 #3798
• Bump com.fasterxml.jackson:jackson-bom from 2.18.2 to 2.18.3 #3772

🐞 Bug Fixes

• Kafka ProducerRecord may end up with duplicated trace headers #3792
• Handle null group id in listener observation #3783
• Fix KafkaTemplate hiding exceptions when starting observation #3780

🔨 Dependency Upgrades

• Bump io.micrometer:micrometer-bom from 1.13.11 to 1.13.12 #3797
• Bump io.micrometer:micrometer-tracing-bom from 1.3.9 to 1.3.10 #3796
• Bump io.projectreactor:reactor-bom from 2023.0.15 to 2023.0.16 #3795
• Bump org.springframework.data:spring-data-bom from 2024.0.9 to 2024.0.10 #3794
• Bump org.springframework:spring-framework-bom from 6.1.17 to 6.1.18 #3793

🐞 Bug Fixes

• Using ConcurrentMessageListenerContainer section of reference doc is a bit confusing #3759
• Metric collection for errors always report the same error "ListenerExecutionFailedException" regardless of what's thrown in the consumer method #3757
• Async suspend function listener not automatically acknowledged? #3743
• KafkaMessageListenerContainer.getAssignedPartitions is not safe #3726

🔨 Dependency Upgrades

• Bump org.springframework.data:spring-data-bom from 2024.1.2 to 2024.1.3 #3749
• Bump io.projectreactor:reactor-bom from 2024.0.2 to 2024.0.3 #3748
• Bump io.micrometer:micrometer-tracing-bom from 1.4.2 to 1.4.3 #3747
• Bump org.springframework:spring-framework-bom from 6.2.2 to 6.2.3 #3746
• Bump io.micrometer:micrometer-bom from 1.14.3 to 1.14.4 #3745