How many types of microservices are there in Java?

Here, we are going to create 3 different microservices. First microservice is Discovery Server which is a Eureka server. Second microservice is Authentication Service which is Producer service and Third microservice is Consumer service which is discovery client.

While there are literally dozens of ways to implement a microservices architecture pattern, three main topologies stand out as the most common and popular: the API REST-based topology, application REST-based topology, and the centralized messaging topology .