Implementing Reactive Spring Boot Apps with Kotlin, WebFlux, R2DBC, and Postgres

2023/07/28

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This article provides a comprehensive guide on implementing and testing reactive Spring Boot apps using Kotlin, Spring WebFlux, R2DBC, and Postgres database. The author starts by introducing the concept of reactive programming and its benefits. They then walk through the process of setting up a project with the necessary dependencies, including Kotlin support for Jackson, Spring WebFlux, Spring Boot Data R2DBC Starter, and the Postgres driver provided by R2DBC. The article also covers the inclusion of testing dependencies, such as Testcontainers, JUnit 5, and Mock Server Netty module. The author provides code examples for creating a model class, repository interface, and a REST controller in Kotlin. They demonstrate how to interact with the database in a reactive way using Spring Data Repositories and return objects wrapped by Reactor Mono and Flux. Overall, this article serves as a valuable resource for developers looking to build reactive Spring Boot apps with Kotlin and utilize WebFlux, R2DBC, and Postgres.