[{"_1":2,"_72":-5,"_73":-5},"loaderData",{"_3":4,"_44":45},"root",{"_5":-5,"_6":-5,"_7":8,"_22":23,"_24":25,"_26":27,"_30":31,"_36":37,"_38":39,"_40":41},"user","shoppingCartId","shoppingCart",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":20,"_21":14},"id","no-cart","count",0,"free",true,"updatedAt","","paymentGateway","STRIPE","cartItems",[],"loading","locale","en","readerTheme","light","constants",{"_28":29},"paypalClientId","AX53Cwz8jR6rVVzzZiZNWWXl0dGagi-GZrjG-S3Ua14E5nrKMn7DxDQ730O4R8LusLPp49ALn6aRVaEy","publishers",{"_32":33,"_34":35},"companies",[],"universities",[],"learnerOrganizations",[],"needsLocaleCookieSync",false,"announcements",{"_42":-5,"_43":-5},"announcement_store","announcement_authors","routes/_store+/_readers+/email_author.$slug/route",{"_46":47,"_71":-5},"book",{"_9":48,"_49":50,"_51":52,"_53":54,"_55":56,"_57":58},"Z2lkOi8vbGVhbnB1Yi9TdG9yZTo6Qm9va1Byb2R1Y3QvNzc2Nzk","title","Event Driven Architecture with Spring Boot 4.x and Kafka 4.x","state","published","contactAuthorMethod","email","aboutText","

Event-driven architecture is how modern systems scale, and how they fail silently when done wrong. This book is a practical guide to building production-grade event-driven systems with Apache Kafka 4.x and Spring Boot 4, written for developers who want to understand not just how, but why.

You'll start with the fundamentals: why monoliths hurt, what Kafka actually does under the hood, and how to wire your first event pipeline with KafkaTemplate and @KafkaListener. From there, you'll tackle the patterns that make or break real systems: CQRS, Event Sourcing, the Saga pattern, the Outbox pattern, idempotency, and schema evolution, with full working code for each.

The second half of the book goes where most tutorials stop. You'll cover observability across async services, testing strategies for event-driven systems, cache coherence in distributed read models, migrating legacy monoliths incrementally, and running multi-tenant Kafka infrastructure at scale.

Every chapter is grounded in production reality. You'll see the mistakes teams make, why they happen, and how to avoid them. Code examples use KRaft-mode Kafka (no ZooKeeper), Spring Boot 4's virtual thread model, and modern Java throughout.

What you'll learn:

- Build event pipelines with Spring Kafka and KafkaTemplate

- Implement CQRS and Event Sourcing with a full working example

- Coordinate distributed transactions with the Saga pattern

- Guarantee delivery with the Outbox pattern and CDC

- Evolve schemas safely with Avro and Confluent Schema Registry

- Trace events across services with OpenTelemetry

- Test async systems without flaky timeouts

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