Quickly and productively build complex Kotlin-based Spring applications and microservices out of the box, with minimal concern over things such as configurations. This revised edition will show you how to fully leverage the Spring Boot 3 micro-framework and apply it to create enterprise-ready Kotlin-based cloud-native applications, microservices, and web applications that just work.   The book covers what has been added to the new Spring Boot 3 release, including improved support for the Kotlin programming language, changes to Stream Editor UI, Maven Preemptive Authentication, building Docker images using cloud-native build packs, building layered jars for optimized Docker images, E2E traceability for configuration properties, many dependency upgrades, support for Spring Data, and much more.  This book is your in-depth pragmatic guide for increasing your enterprise Kotlin and cloud application productivity while decreasing development time. It is a no-nonsense guide with case studies of increasing complexity throughout the book. The main author, a senior solutions architect and Principal Technical instructor at Pivotal, the company behind the Spring Framework, shares his experience, insights, and first-hand knowledge about how Spring Boot technology works, and best practices.  This is an essential book for your Kotlin-based Spring learning and reference library.  What You Will LearnBuild cloud-native apps and microservices with the Spring Boot 3 frameworkPersist and access your data using and integrating with Spring DataMessage with Kafka, RabbitMQ, and WebSocketsExplore Spring Cloud projectsExtend Spring Boot by creating your own Spring Boot Starter and @Enable featureTest and deploy Spring Boot with best practicesEffectively use Kotlin as a programming language for Spring applications Who This Book Is ForExperienced Spring, Java, and Kotlin developers seeking increased productivity gains and decreased complexity and development time in their applications and software services