Former senior programmer at a Fortune Global 500 company, dedicated to sharing Java expertise. Visit Feng's site: Java Knowledge Sharing, www.java1234.com
The article compares PostgreSQL and MySQL, detailing PostgreSQL’s richer data types, true sequence support, extensible ecosystem, advanced monitoring and replication features, while also acknowledging MySQL’s simplicity and strong points, to help readers decide which database fits their workload best.
Redis uses both time‑based and lazy expiration, marking keys as expired at their TTL but only removing them on the next access or during periodic cleanup, so expired keys are not deleted the instant they expire.
The article compiles several Zhihu responses explaining why many developers dislike interview coding tasks, citing irrelevance to real work, overemphasis on algorithmic puzzles, time waste, mismatch with production priorities, and the perception that such tests favor test‑crackers over truly skilled engineers.
Programmers rarely build their own mini‑programs for profit because company registration, mandatory software copyright, intense workload, low side‑income, high development and operational costs, and the dominance of existing platforms create steep technical, financial, and market barriers.
The article explains the definitions, typical scenarios, and practical Java solutions for Redis cache breakdown, cache penetration, and cache avalanche, showing how mutex locks, Bloom filters, and staggered expirations can prevent database overload and improve system reliability.
The article shows how cluttered Spring controllers filled with try‑catch blocks, manual field checks, and business logic can be refactored into concise, readable code by using @Valid, assertion utilities, and a global exception handler, cutting the code size roughly in half.
This article explains how to design a highly available service registry for microservice architectures, covering high‑availability mechanisms, performance optimizations, scalability strategies, core registry functions, and provides a complete Java Spring Boot implementation using Redis.
MySQL 8.2 introduces native read/write splitting via MySQL Router, allowing automatic routing of reads to replicas and writes to the primary in an InnoDB ReplicaSet without any application changes.
This article shows how to let users upload a JAR that implements a predefined interface, then hot‑deploy the new implementation at runtime using either Spring annotation‑based registration or plain reflection, including bean registration, removal, and a test harness.
This article explains how @Autowired and @Resource differ in Spring Boot, covering their injection mechanisms, priority rules, applicable environments, and code examples, helping developers choose the appropriate annotation based on type‑based or name‑based injection needs.
