Java Microservices Project with Eureka, Spring Cloud Config, and H2 Database

Project Overview

This project is a microservices architecture built using:

• Eureka Server for service discovery
• Spring Cloud Config Server for centralized configuration
• Spring Cloud Client to retrieve configurations
• H2 Database as an in-memory database

The project consists of the following services:

1. Config Server - Centralized configuration stored in a GitHub repository.
2. Service Main - The main service that fetches configurations from the Config Server.
3. Service One - A microservice that depends on Service Main.
4. Service Notification - A notification service that also depends on Service Main.

Project Structure

config-microservice-centralized/  # Configuration stored in GitHub repo
service.main/                     # Main service (Eureka Server)
service-one/                      # Dependent microservice
service.notification/              # Notification service

Prerequisites

Ensure you have the following installed:

• JDK 17+
• Maven
• Docker (Optional, if running in containers)

Running the Project

1. Start the Config Server

The configuration files are stored in a GitHub repository: config-microservice-centralized

Ensure that service.main, service.one, and service.notification fetch their configurations from this repository.

2. Run Service Main (Eureka Server)

Navigate to the service.main directory and run:

mvn spring-boot:run

This will start the Eureka Server and retrieve configurations from the Config Server.

3. Run Service One

Navigate to the service-one directory and run:

mvn spring-boot:run

This service will register itself with the Eureka Server.

4. Run Service Notification

Navigate to the service.notification directory and run:

mvn spring-boot:run

This service will also register itself with the Eureka Server.

Accessing the Services

• Eureka Dashboard: http://localhost:8181
• Service Main: http://localhost:8181
• Service One: http://localhost:8881
• Service Notification: http://localhost:8082

Database

This project uses an in-memory H2 database. To access the H2 console, navigate to:

http://localhost:8881/h2-console

Use the following credentials:

• JDBC URL: jdbc:h2:mem:tasks
• Username: sa
• Password: (leave blank)

Conclusion

This setup ensures that all services fetch their configurations dynamically and register themselves with Eureka for service discovery. Modify the properties in the config-microservice-centralized repository to manage configurations centrally.