Code Mill Hub | Backend Engineering https://code-mill-hub.com/blog/ Deep dives into Java, Spring Boot, and high-performance backend architecture. en-us shflzp12@gmail.com (Maria) shflzp12@gmail.com (Maria) Tue, 07 Jul 2026 00:00:00 GMT https://code-mill-hub.com/blog/spring-boot/2026-07-07-mastering-exactly-once-message-processing-spring-boot-kafka-postgresql/ [Ultimate Guide] Mastering Exactly-Once Message Processing: End-to-End Guarantees with Spring Boot 4.0, Apache Kafka, and PostgreSQL https://code-mill-hub.com/blog/spring-boot/2026-07-07-mastering-exactly-once-message-processing-spring-boot-kafka-postgresql/ This definitive guide deconstructs the critical challenge of ensuring message delivery and processing integrity, providing a robust, end-to-end architectural blueprint for achieving "effectively once" semantics in complex event-driven microservices built with Spring Boot, Apache Kafka, and PostgreSQL. Tue, 07 Jul 2026 00:00:00 GMT shflzp12@gmail.com (Maria) KafkaExactly-OnceSpring BootDistributed SystemsMessage ProcessingPostgreSQLMicroservicesTransactional OutboxIdempotent ConsumerData Consistency