Reactive Microservice in Spring Boot with Database, Kafka, and Azure API Integration

The reactive programming paradigm has gained significant popularity due to its ability to handle asynchronous streams of data efficiently. In this blog, we will walk through building a reactive microservice in Spring Boot that connects to a database, interacts with Kafka, and integrates with Azure cloud services. This step-by-step guide will include code examples to help you implement each feature seamlessly.

Prerequisites

1. Java 17 or later installed on your machine.
2. Maven or Gradle build tool.
3. Kafka setup running locally or in a cluster.
4. Azure account with required services like Azure App Service or Azure API Management enabled.

Step 1: Create a Spring Boot Application

Start by generating a Spring Boot project using Spring Initializr:

• Dependencies:
• Spring Reactive Web
• Spring Data R2DBC
• Spring for Apache Kafka
• Spring Boot Actuator
• Azure SDK (specific SDKs for the service you plan to use)

curl https://start.spring.io/starter.zip \
  -d…