A practical reflection on microservice overengineering, deployment coupling, cross-service consistency, and a checklist for choosing module boundaries in a small Java platform.
A practical Java guide to containing slow dependencies with rate limits, concurrency caps, timeouts, Sentinel circuit breakers, and business-safe fallbacks.
An order detail endpoint looks simple in Java. Load the order, retrieve the customer profile, check inventory, fetch delivery information, and assemble the response. With OpenFeign, each dependency can look like an ordinary interface call. That convenience is useful, but…
Learn why clock skew breaks event ordering in distributed systems, with Java examples for Clock.fixed, System.nanoTime(), Lamport clocks, and order versions.
A customer pays for an order, but the promised reward points never appear. Another customer receives the same reward twice. Both problems can happen even when the message broker is available and persistence is enabled. The first failure might occur…
Two checkout requests reach different Java service instances while a product has one unit left. Each instance enters its own synchronized block, reads the same stock value, and creates an order. Both eventually write zero back to the database. The…
A practical Java order workflow comparing local transactions, the transactional outbox, TCC, and Saga for inventory, payments, rewards, and refunds.