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 walks through four practical ways to revert code that has already been pushed to a remote Git repository—including manual diff removal, using git revert, creating a new branch, and resetting the current branch with hard, mixed, or keep options—plus tips on force‑pushing and branch protection.
The article first lists a series of Java learning projects and community benefits, then critically examines the widely touted advantages of microservices, showing how many of those claims originate from older technologies, debunking common myths, and concluding that microservices are essentially just modular code.
The article explains Apple's 30% App Store commission, clarifies why services like 12306 train tickets are exempt, outlines the definition of in‑app purchases in the App Store Review Guidelines, and details the developer agreements and recent policy exceptions that affect fee structures.
This article explains Netty’s architecture, compares Java’s BIO/NIO/AIO models, describes its thread models and pipeline, and provides a step‑by‑step guide with code to build a WebSocket‑based real‑time chat server using Spring Boot 3 and JDK 21.
This guide explains how to integrate the nmap4j library into Java projects to perform Nmap‑based port scanning, service detection, and OS identification, covering prerequisite setup, key command‑line flags, Windows and Linux implementations, and parsing XML results with Dom4j.
This guide walks through deploying OnlyOffice (Docker or Ubuntu), configuring the server, adding a Vue front‑end with the OnlyOffice API, building a Spring Boot controller to serve and save documents, handling callbacks, and troubleshooting common issues such as service status, token settings, and proxy configuration.
This guide walks you through setting up IntelliJ IDEA and Docker to replace manual jar uploads with a single‑click remote deployment for Spring Boot applications, covering prerequisites, SSH configuration, Docker daemon basics, Dockerfile creation, and the final one‑step deployment process.
The article recounts a real‑world case where a massive device table (over 500 million rows) suffered from sharding and Elasticsearch integration issues, describes a pagination bug caused by Sharding‑JDBC, and presents a comprehensive set of hardware, software, and SQL optimization techniques—including MySQL configuration examples—to improve performance.
This article explains the performance drawbacks of using UUIDs as primary keys in MySQL—including larger indexes, random inserts, and slower comparisons—details why data updates trigger index refreshes, and offers practical optimization techniques such as ordered UUIDs, binary storage, hybrid auto‑increment keys, and table partitioning.
This guide explains why Docker pull commands often timeout in China due to outdated foreign registries, lists common invalid mirror configurations, provides three verified mirror URLs for 2025, and walks through editing the daemon.json file, restarting Docker, and testing the setup, while sharing practical troubleshooting lessons.
