v4.0.6

⭐ New Features

• make the method setBackOffFunction work for the batch processing as well #4473

🐞 Bug Fixes

• Require exact package match for trusted header types #4497
• Harden retry topic headers decoding in Spring Kafka #4495
• Fix unbounded cache in DelegatingDeserializer #4491
• @RetryableTopic: built-in DLT logging handler fails with "No Acknowledgment available" on 4.0 (works on 3.3.x) #4474
• Different behavior for value serializer mappings for different classloaders #4461
• NPE when properties are not defined for StreamsBuilderFactoryBean #4454
• DefaultAfterRollbackProcessor for batch-listeners consuming ConsumerRecords doesn't seek consumer #4452
• Inconsistent handling of non-string values in Properties argument passed to DefaultConsumerFactory::createKafkaConsumer #4421

📔 Documentation

• Spring Kafka documentation does not mention spring-boot-starter-kafka requirement for Spring Boot 4 #4464

🔨 Dependency Upgrades

• Bump org.springframework.data:spring-data-bom from 2025.1.5 to 2025.1.6 #4488
• Bump org.springframework:spring-framework-bom from 7.0.7 to 7.0.8 #4478
• Bump io.micrometer:micrometer-tracing-bom from 1.6.5 to 1.6.6 #4477
• Bump io.projectreactor:reactor-bom from 2025.0.5 to 2025.0.6 #4476
• Bump io.micrometer:micrometer-bom from 1.16.5 to 1.16.6 #4475
• Bump org.slf4j:slf4j-api from 2.0.17 to 2.0.18 #4446