Focused on Java interview questions and practical article sharing, covering algorithms, databases, Spring Boot, microservices, high concurrency, JVM, Docker containers, and ELK-related knowledge. Looking forward to progressing together with you.
This article compiles a concise list of domestic software outsourcing firms, explains practical signs to differentiate outsourcing companies from regular employers, discusses common outsourcing models, and outlines scenarios where joining an outsourcing firm can be a strategic career move.
This article explains the Redis split‑brain problem that can occur in master‑replica clusters, outlines the interview points interviewers look for, and provides a detailed solution using the min‑replicas‑to‑write (or min‑slaves‑to‑write) configuration to sacrifice write availability for data consistency, along with best‑practice recommendations and common pitfalls.
The article examines Maven 4’s major upgrades—including a new 4.1.0 POM model, Build POM/Consumer POM separation, explicit artifact types, subproject renaming, tree‑based lifecycle, and richer configuration expressions—while also noting the tool’s migration assistance and its impact on modern Java development.
The article analyzes why the first OpenFeign call in micro‑service systems incurs seconds of latency, breaks down five root causes such as lazy client initialization, dynamic proxy creation, load‑balancer cold start, network handshake, and hidden dependencies, and provides concrete verification steps and four practical optimizations to move the cost to application start‑up.
The article details a step‑by‑step migration from MyBatis 3.5.0 to MyBatis‑Plus 3.1.1, explains why the conversion error for java.time.LocalDateTime appears after the switch, shows how to trace the root cause through stack traces, upgrades the mysql‑connector‑java to 5.1.37 (and later 5.1.42) to resolve the issue, and shares broader lessons about component upgrades and unexpected bugs.
Jeandle, an open‑source JIT compiler built on LLVM, introduces LLVM’s performance and modularity to the OpenJDK HotSpot JVM, explains core concepts of JIT and LLVM, outlines technical challenges, and presents a roadmap toward full bytecode support and advanced optimizations.
This guide explains how to design, configure, and implement a Prometheus‑based monitoring solution for big‑data components running in Kubernetes, covering metric exposure methods, scrape configurations, alerting architecture, dynamic rule management, exporter deployment, and practical examples with full YAML snippets.
This article breaks down the interview expectations around database normalization, explains the theory and trade‑offs of normalization versus denormalization, provides SQL code examples, compares design impacts, offers best‑practice guidelines, and warns against common misconceptions.
This article explains how Redis handles concurrency, clarifying that core command processing remains single‑threaded while multi‑threaded I/O was introduced in Redis 6.0, and provides interview insights, architectural evolution, configuration examples, best practices, and common pitfalls.
A detailed analysis shows that when a class is annotated with both @Configuration/@Bean and @Component, Spring creates only one bean—the one defined by @Configuration/@Bean—overriding the @Component definition, and explains how this behavior changed across Spring and Spring Boot versions.
