Focus on Java-related technologies: SSM, Spring ecosystem, microservices, MySQL, MyCat, clustering, distributed systems, middleware, Linux, networking, multithreading. Occasionally cover DevOps tools like Jenkins, Nexus, Docker, and ELK. Also share technical insights from time to time, committed to Java full-stack development!
Learn how to design, implement, and deploy a multi‑tenant architecture using Spring Boot and Spring Cloud, covering concepts, advantages, database strategies, dynamic routing, service registration, configuration management, and practical code examples for scalable SaaS applications.
This article explains why code quality degrades as systems grow, introduces five essential static‑analysis tools (Alibaba Java Coding Guidelines, CheckStyle, PMD, FindBugs, and SonarLint), and provides step‑by‑step installation and usage instructions with screenshots to help developers reduce bugs and improve maintainability.
This article investigates why MySQL recommends auto‑increment primary keys over UUIDs by building three test tables, measuring insert speeds with Spring JdbcTemplate, analyzing index structures, and discussing the performance trade‑offs and drawbacks of each approach.
This article explores a curated list of small yet impactful open‑source projects—from AI accelerators like DeepSeek and FlashMLA to essential libraries such as Skynet, LevelDB, and OpenCV—showing how they sustain large communities and drive innovation across the software ecosystem.
A new Java developer caused a production NullPointerException while matching third‑party data, and the article walks through reproducing the bug, analyzing each faulty line, and applying defensive programming techniques such as early returns, Optional, Objects.equals, and collection checks to prevent similar crashes.
This article recounts a disastrous production server data loss caused by an accidental rm -rf command, details the step‑by‑step recovery using ext3grep, extundelete and MySQL binlog, and shares hard‑earned lessons to prevent similar incidents.
This article explores four common rate‑limiting algorithms—fixed window, sliding window, leaky bucket, and token bucket—explains their core principles, shows Java and Redis implementations, discusses real‑world production cases, and provides practical tips for avoiding pitfalls and optimizing performance.
Explore Spring’s extensibility by mastering global exception handling with @RestControllerAdvice, creating custom MVC interceptors, accessing the container via BeanFactoryAware, importing configurations, adding startup logic, modifying BeanDefinitions, using initialization callbacks, and defining a thread‑local custom scope for per‑thread bean instances.
ThreadLocal has long served as Java’s go‑to tool for thread‑local data, but its memory‑leak risks and performance penalties become pronounced with virtual threads, while the newer ScopedValue offers automatic cleanup, immutable safety, and superior efficiency, making it a compelling replacement in high‑concurrency scenarios.
This article explains how Jackson's @JsonAnySetter and @JsonAnyGetter annotations let Java classes gracefully handle unknown JSON properties by collecting them into a map during deserialization and emitting them as regular fields during serialization, complete with practical code examples and usage tips.
