Spring Boot, and the Spring Framework that Spring Boot is based on, is a great framework for developing microservices in Java.
Larsson, Magnus. Microservices with Spring Boot and Spring Cloud: Build resilient and scalable microservices using Spring Cloud, Istio, and Kubernetes, 2nd Edition (p. 67). Packt Publishing. Kindle Edition.
In this article, we will not discuss Microservices (this post about Introduction Microservices) here, we just share knowledge about fundamental Spring Boot.