Microservices with Spring Cloud, Docker, Kafka, Swagger (OpenAPI), PostgreSQL, Spring Boot 3

DEVELOPER

• Eduardo Cristóbal
• Linkedin: https://www.linkedin.com/in/ecristobale
• GitHub: https://github.com/ecristobale
• Email: Eduardo Cristóbal - email

DESCRIPTION

The goal of this project is to create a microservices system using Spring Boot 3 and Java 17 . The following technologies and tools are used:

• Spring Cloud
• Swagger (OpenAPI)
• Spring Cloud Streams with Kafka
• Kafka topics:
  • consumerReport for Kafka Consumer: on received invoke service for writing in MongoDB
  • consumerCbReport for Kafka Listener (sending serialized entity as JSON string): on received invoke service for write in PostreSQL
• Docker: dockerized each microservice and resource (Kafka, Mongo DB, Postgre DB)
• Microservices: Registry Service (Eureka), Config Service, Feign, Load Balancer, Spring Cloud Gateway, Circuit Breaker pattern
• Spring Security Oauth2 + JWT
• Metrics with Zipkin: created custom span
• DBs: PostgreSQL and MongoDB
• Postman
• DBeaver and Studio 3t
• IntelliJ
• Visual Studio Code
• Sourcetree
• Docker Desktop

Microservices system arquitecture:

Screenshots:

• Eureka Server registered some instances of companies microservice:

• Swagger (OpenAPI) for companies microservice:

• GitHub project with .yml files (profiles: default, prod and qa) for config-server:

• Feign with Load Balancer to communicate between microservices:

• Spring Cloud Streams with Kafka: consuming Kafka message and saving it to MongoDB:

• Schema: circuit breaker (fallback part) with Kafka for writing operations:

• Spring Cloud Streams with Kafka: Kafka listener event message received as JSON string and saving it to Postre DB:

• Dockerized each ms and resource from docker-compose:

• Dockerized each ms and resource from Docker desktop:

• Zipkin span in companies-crud get /company/{name}:

• Zipkin query for service: companies-crud:

• Zipkin custom span: