Spring Boot Microservices
20 lessons in this section of the Spring Boot tutorial. Work through them in order, or jump to the one you need.
- 1.Introduction to Microservices
Microservices is an architectural style that structures an application as a collection of small, independently deployable services, each running in its own process and…
- 2.Monolithic vs Microservices
A practical comparison of monolithic, modular monolith and microservices architectures for Java and Spring Boot teams.
- 3.Spring Cloud Tutorial: Config Server, Eureka, Gateway, OpenFeign and Resilience4j
Spring Cloud explained with working config: release trains, Config Server, Eureka, Gateway, OpenFeign and Resilience4j, plus when Kubernetes replaces them.
- 4.Service Discovery
Learn how service discovery works in Spring Boot microservices: client-side vs server-side discovery, Eureka server and client setup, health checks and heartbeats…
- 5.Eureka Server
How to run a Eureka service registry with Spring Cloud: dependencies and version matching, server setup, securing it, registering client services and calling them by…
- 6.Eureka Client
Set up a Spring Boot Eureka Client: registration, heartbeats, health checks, @LoadBalanced calls, load balancing strategies and instance metadata, with examples.
- 7.API Gateway
An API Gateway is the single entry point for all client requests in a microservices architecture.
- 8.Spring Cloud Gateway
Spring Cloud Gateway (SCG) is the official API gateway for Spring Boot microservices.
- 9.Load Balancing
Load balancing distributes incoming requests across multiple instances of a service to maximise throughput, minimise latency, and avoid overloading any single instance.
- 10.OpenFeign
Spring Cloud OpenFeign is a declarative HTTP client for microservices.
- 11.Circuit Breaker
The Circuit Breaker pattern prevents cascading failures in a distributed system by wrapping remote calls with a state machine that monitors failure rates.
- 12.Resilience4j
Resilience4j is a lightweight fault-tolerance library for Java, designed as the replacement for Netflix Hystrix in Spring Boot 3.x.
- 13.Distributed Tracing
Distributed tracing tracks a request as it flows through multiple services, providing end-to-end visibility into latency, errors, and dependencies.
- 14.Config Server
Spring Cloud Config Server provides centralised external configuration for distributed systems.
- 15.Centralized Configuration
Configuration drift is one of the most common causes of 'works in staging, breaks in production'.
- 16.Service Registry
In a system of many services whose addresses change as instances start, stop and scale, a service registry is the live directory that maps a logical name such as…
- 17.Inter-Service Communication
Microservices communicate through synchronous HTTP calls or asynchronous messaging.
- 18.Fault Tolerance
Fault tolerance is the ability of a distributed system to continue operating correctly in the presence of partial failures.
- 19.Rate Limiting
Rate limiting controls the number of requests a client is permitted to make within a time window.
- 20.Microservice Security
Securing a microservices architecture requires protecting traffic at multiple layers: authenticating external clients at the API Gateway, propagating identity between…