Java Microservices
Master Java microservice architecture — Spring Cloud, service discovery, API gateways, event-driven communication, and distributed systems.
55 min•By Priygop Team•Last updated: Feb 2026
Microservice Architecture
- Monolith vs Microservices: Monolith is one deployable unit — simpler but harder to scale independently. Microservices are independent services — scale individually but add distributed systems complexity
- Spring Cloud: Spring Cloud Netflix/Spring Cloud Gateway — service discovery (Eureka), API gateway (Gateway), circuit breaker (Resilience4j), config server (Config)
- Service Communication: REST (synchronous, simple) vs Message Queues (async, resilient). Use Kafka/RabbitMQ for event-driven communication between services
- API Gateway: Single entry point — request routing, authentication, rate limiting, load balancing. Spring Cloud Gateway replaces Zuul. Handles cross-cutting concerns
- Circuit Breaker (Resilience4j): Prevent cascade failures — if service B is down, don't keep calling it. Open circuit returns fallback response. Auto-recovery after timeout
- Distributed Tracing: Micrometer Tracing + Zipkin — trace a request across all microservices. Correlation ID propagated through headers. Essential for debugging distributed systems