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 guide explains the browser same‑origin policy, why cross‑origin restrictions exist, and presents five practical solutions—including CORS, proxy servers, JSONP, postMessage, and WebSocket—along with detailed configuration examples, code snippets, performance tips, and common interview follow‑up questions.
After optimizing a Spring Boot channel service, a mysterious extra ~100 ms appeared per request; detailed tracing with Arthas revealed that embedded Tomcat repeatedly loads Swagger UI META‑INF resources, causing a 70 ms overhead, which can be eliminated by upgrading Tomcat or removing the Swagger dependencies.
This guide explains why hot‑reloading Java code is essential for large Spring Boot projects, compares three approaches—Spring Boot DevTools, IntelliJ IDEA's built‑in HotSwap, and the JRebel plugin—and provides step‑by‑step installation and usage instructions for each method.
This article provides a comprehensive technical guide for Java interviewers, detailing HTTP’s security flaws, how HTTPS resolves them through SSL/TLS encryption, certificate verification, and hybrid cryptography, and includes handshake steps, performance comparisons, common follow‑up questions, and concise memory mnemonics.
This article analyzes three categories of techniques—naïve, conventional, and advanced—for performing fuzzy queries on encrypted fields, compares their memory and performance trade‑offs, provides concrete code examples and storage calculations, and recommends the most practical approach for production systems.
This guide outlines interview focus points, core definitions, and deep analysis of Cookie, Session, and Token (JWT), compares their storage, security, scalability, and cross‑origin support, and provides high‑frequency follow‑up questions, common variants, memory mnemonics, and selection principles for Java authentication.
The article explains what Open Session in View (OSIV) is, why keeping a Hibernate Session open for the whole request can silently cause massive N+1 query problems in Spring Boot REST APIs, and provides a concrete example and step‑by‑step solution using explicit fetch joins and disabling OSIV.
Spring Data AOT (Ahead‑of‑Time) repositories move reflection, method‑name parsing, JPQL generation and proxy creation from runtime to build time, dramatically speeding up Spring Boot 4 application startup, reducing memory usage, and surfacing configuration errors early in the compilation phase.
This article explains why the interview question "String str = new String(\"abc\")" can create either one or two objects depending on JVM string pool state, detailing the JVM memory model, string pool mechanics, code examples, best practices, and common misconceptions.
This article explains three practical ways to automatically cancel orders that remain unpaid for 30 minutes in a Spring Boot application, covering a scheduled task, a RabbitMQ delayed queue, and Redis key‑expiration events, with complete code examples and configuration steps.
