E‑commerce, SaaS, AI architect; DDD enthusiast; SKILL enthusiast
This article walks through three ways to map JSON columns to Java objects in MyBatis, explains why simple String or JSONObject approaches are fragile, and provides a complete custom TypeHandler implementation, registration, and usage example for complex entity fields.
The article compares redundant and normalized storage, explains their trade‑offs, and introduces an in‑memory aggregation technique implemented via a repository "fill" method in Java, showing how to replace costly SQL joins with flexible, code‑driven data merging while preserving consistency and performance.
The article presents a technique that uses a generic AggregateController, dynamic model‑name routing, and a lightweight mapping container to share CRUD logic across dozens of tables, reducing hundreds of API methods to just two controllers while keeping the codebase clean and extensible.
The article walks through a DDD‑inspired four‑layer microservice architecture, explains how an application SDK enables RPC communication across services, details each architectural layer, and showcases the open‑source D3boot framework that bundles reusable base components, BOM management, and SaaS‑ready features for rapid backend development.
The 2023 IT job market has collapsed into a buyer's market with sub‑5% recruiter response rates, soaring candidate competition, higher education filters, and salary stagnation, prompting programmers to lower expectations, sharpen interview skills, and aggressively network for remote or foreign opportunities.
This article walks through the author’s two‑year experience applying Domain‑Driven Design to payment, settlement and fund services, explains strategic vs tactical design, compares classic DDD layers, Clean, Hexagonal and Diamond architectures, details module organization, CQRS, and shares practical pros, cons and implementation tips.
The article demonstrates how to use Spring's HandlerMethodArgumentResolver to automatically convert Kafka messages into typed method parameters, eliminating repetitive JSON parsing code and showing a complete implementation, usage example, and notes on version support and performance considerations.
In business‑driven companies, developers must prioritize understanding the business, foster cross‑team collaboration, and broaden their perspective beyond pure coding, because technical prowess alone is insufficient for survival, growth, and career advancement.
The article recounts a production incident where a Kafka‑based consumer in a finance microservice hit thread‑pool exhaustion and slow‑query alerts, analyzes the root causes of async processing and bulk message bursts, and outlines a three‑phase remediation that includes data repair, switching to synchronous consumption, and request‑level batching to prevent future failures.
The article explains that becoming a software architect requires more than years of experience—it demands a blend of deep technical expertise, strong business insight, and effective management skills to build a personal moat and avoid being left behind as the industry evolves.
