Interactive Enterprise Microservice Labs
E-Commerce Order Processing Enterprise Lab
Interact with an enterprise-grade resilient order processing microservice using Feign clients, Resilience4j, and database locks.
Last Updated: June 15, 2026
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25 min read
Lab Overview
Welcome to the E-Commerce Order Processing Enterprise Microservice Interactive Lab. This lab showcases an advanced enterprise architecture featuring Resilience4j circuit breakers, Feign clients for inter-service communication, pessimistic database locks for transactional safety, and OAuth2 security configuration.
Use the project explorer to study these production-grade components:
- Resilient Client: Inspect how Feign client interfaces integrate with Resilience4j circuit breakers and fallbacks.
- Pessimistic Locking: Observe how database write-locks protect stock depletion from concurrent race conditions.
- Security Configuration: Inspect the spring security filter chain mapping token validation.
- Global Error Handling: Study how REST controllers return standardized problem detail JSON payloads during failures.