Microservices with Java Spring Boot, Spring Cloud and Spring Security

Overview

The objective of this project is to show a micro services structure using Spring Framework and it's moderns tools such as Spring Boot, Spring Cloud and Spring Security.

Features we already have :

• Eureka server to connect ours app services
• Config server to centralize configuration
• Api Gateway to expose ony one API to the world
• OAuth protocol, with Authenticantion Server and Resource Server

Disclaimer: As the focus here is on microservices architecture, you can see that the services are quite simplistic, using an h2 database with few data and only exposing rustics GET requests.

Phase 1: Basic Services, Feign, Ribbon

1. Services :

• hr-worker
• hr-payroll

2 Feign :

OpenFeign provides an integration with Spring Boot, using it's auto configuration to easily perform REST requests.

3 Ribbon load balancing :

Netflix Ribbon create a client side balance load between multiples instances of a same application

Phase 2: Eureka, Hystrix, Zuul

1. Eureka :

Spring Cloud Netflix provides Eureka server-client configuration, so you can register the services apps to a Eureka Server App that handles the load balance and failover.

2. Hystrix :

Circuit Breaker Hystrix can handle failures, providing fallbacks via annotation

3. Zuul :

hr-api-gateway-zuul : Eureka Zuul is the reverse proxy working as an api gateway to filter and router all client's requests

Phase 3: One config to rule them all

1. Hr-Config

This application provides configuration files (on github) to all services that register to it. This configurations can be specific to a service, even filtering by profiles, or global to all

2. Actuator :

Actuator provides many endpoints to app monitoring.

Phase 4: Authentication & Authorization

1. Services :

• Hr-user : service with db (h2) to provide de users and its roles
• Hr-auth : authorization server

2. Authorization Server :

Spring Security implements oauth protocol, using Basic auth for client authentication and Jwt for user token

3. Server Resource :

Zuul gateway app (hr-api-gateway-zuul) authorize and authenticate the routes based on the token's request. Authorization server is public, though

Credits

This project was based on a udemy's course called "Microsserviços Java com Spring Boot e Spring Cloud", so here is my credits to Nélio Alves, who is a great teacher and professional, and his staff. You can check this out on this link : https://www.udemy.com/course/microsservicos-java-spring-cloud/

If you want to test it out

In case you want to test this microservice, follow this steps:

• Clone or Download all files
• Run the microservices in this order: hr-config, hr-eureka-server, all others in any order
• Import the Postman's collection and the Postman's envs to your Postman
• Have Fun!

Extra

You can see this same project using dockers in "Docker" branch

Contact me if you have any trouble or question about this project