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) Thu, 18 Jun 2026 00:00:00 GMT https://code-mill-hub.com/blog/spring-boot/2026-06-18-mastering-reactive-programming-spring-webflux-r2dbc-kafka/ Reactive Spring Boot 4.1 with WebFlux, R2DBC, and Kafka: Boundaries, Backpressure, and Transactions https://code-mill-hub.com/blog/spring-boot/2026-06-18-mastering-reactive-programming-spring-webflux-r2dbc-kafka/ Build a reactive Spring Boot service without hiding blocking work: model WebFlux demand, use R2DBC transactions correctly, integrate Kafka with explicit delivery semantics, isolate unavoidable blocking calls, and test cancellation and backpressure. Thu, 18 Jun 2026 00:00:00 GMT shflzp12@gmail.com (Maria) Spring WebFluxProject ReactorR2DBCPostgreSQLApache KafkaBackpressureReactive Transactions