v4.0.8

🐞 Bug Fixes

• KafkaTemplate.receive() returns a record at a different offset when the requested offset is missing #4831
• GH-4823: Keep partition pause across child containers #4829
• KafkaAdmin reports topic config alteration failures as 'Failed to obtain topic descriptions' #4827
• ContainerGroupSequencer does not disable autoStartup of containers with an idleEventInterval #4825
• Flaky BatchListenerConversionTests.conversionError() #4822
• DefaultErrorHandler ignores backOffFunction when the default BackOff has no retries #4819
• Share container isInExpectedState() ignores a consumer thread that exited on an error #4813
• ReplyingKafkaTemplate reply future times out instead of failing when the send fails #4812
• AbstractConsumerSeekAware.onPartitionsRevoked() removes other consumers' callbacks #4807
• RoutingKafkaTemplate.partitionsFor() throws UnsupportedOperationException #4806
• Lambda or method-reference Converter beans break @KafkaListener startup #4803
• CommonMixedErrorHandler does not delegate onPartitionsAssigned(), losing records during batch retry #4798
• Support the two-arg deserialize in DelegatingByTopicDeserializer #4793
• Deserialization exception headers mapped outbound with Kafka 4.4 clients #4776
• Cooperative rebalance can leave the partitions a consumer retains permanently unconsumed (async listener) #4771
• Retry topics use BackOff.STOP (-1) as a delay when the BackOff has its own limit #4769
• AbstractConsumerSeekAware retains callback mappings after unregister #4768
• Mixed and delegating error handlers discard remaining batch records when seekAfterError is false #4766
• ExponentialBackOffWithMaxRetries(0) still retries once #4759
• Make ExceptionMatcher cache thread-safe #4758
• acknowledge() after a partial batch ack commits only the next record #4733
• ConcurrentMessageListenerContainer does not report partition pause requests from child containers #4731
• Apply the bootstrap servers supplier in DefaultShareConsumerFactory #4700
• Suspend @KafkaListener: consumer permanently stops fetching partitions it retains across a rebalance #4697
• Async listener reply success path never reports failures to the receiver Observation #4685
• Pending consumer wakeup aborts the next offset commit, which is then skipped #4684
• Copy the type resolver in copyWithType #4667
• ShareKafkaMessageListenerContainer NPEs at start() when built from a topic pattern or partition list #4665
• Do not validate a null deserialized value #4657
• Multi-value header mapping loses values on inbound when a JSON type header is present #4645
• ReplyingKafkaOperations sendAndReceive overloads expose incorrect nullability for replyTimeout and returnType #4641
• DelegatingByTypeSerializer assignable mode can select a more general delegate due to a non-transitive comparator #4632
• Share containers ignore ContainerProperties.clientId #4628
• ShareKafkaListenerContainerFactory.createContainer(String...) does not apply factory configuration #4618
• Assert messages in setTopicPartitions and setDefaultReplyTimeout name the wrong property #4610
• Kafka listener with autoStartup=false is unconditionally started on ApplicationContext.restart() (alwaysStartAfterRefresh=true ignores autoStartup after first refresh) #4607
• Close the default delegate in DelegatingByTopicSerialization #4590
• DelegatingByTypeSerializer does not close its delegates #4580

📔 Documentation

• Fix stale API names in the reference docs #4749
• Misleading autoStartDltHandler property/documentation for @RetryableTopic in tests #4702
• Improve trusted-packages error message guidance #4631
• Fix DeadLetterPublishingRecoverer API names in error-handling docs #4613

🔨 Dependency Upgrades

• Upgrade micrometer-tracing to 1.6.8 #4854
• Upgrade micrometer to 1.16.8 #4851
• Upgrade reactor to 2025.0.8 #4849
• Upgrade spring-data-bom to 2025.1.8 #4846
• Upgrade spring-framework to 7.0.10 #4844
• Bump org.slf4j:slf4j-api from 2.0.19 to 2.0.20 #4721
• Bump org.slf4j:slf4j-api from 2.0.18 to 2.0.19 #4670