Getting Started with Microservices using Spring Boot

When Do You Need Microservices?

Not every project needs microservices. Team size, independent deployment needs and scalability requirements drive this decision.

Core Components

1. Service Discovery — Eureka or Consul
2. API Gateway — Spring Cloud Gateway
3. Config Server — centralized configuration
4. Resilience — circuit breaker with Resilience4j

A Simple Controller

@RestController
@RequestMapping("/api/orders")
public class OrderController {

    private final OrderService service;

    public OrderController(OrderService service) {
        this.service = service;
    }

    @GetMapping("/{id}")
    public OrderResponse get(@PathVariable UUID id) {
        return service.findById(id);
    }
}

Tips

• Keep inter-service communication asynchronous (Kafka/RabbitMQ) when possible.
• Give each service its own database.
• Add distributed tracing for observability.