Sharing Java developer knowledge, practical articles, and continuous insights into computer engineering.
This beginner-friendly guide explains core authentication mechanisms, the OAuth2.0 flow, token types, the role of refresh tokens, JWT pitfalls, and RBAC design, providing a solid foundation for secure backend development.
This article explains a complete, reusable solution for recording operation logs in Java backend applications using Spring AOP, custom annotations, callback interfaces, and a user‑adapter to bridge third‑party logging libraries with the main program, enabling flexible storage and auditing.
Learn how to protect your services from abusive traffic and brute‑force attacks by using Nginx's rate‑limiting features—limit_req to control request rates and limit_conn to restrict concurrent connections—complete with configuration examples, explanations of zones, burst handling, custom error pages, and log monitoring.
This guide shows how to install, configure, and use Ngrok on macOS to create a secure public tunnel that forwards internet traffic to a local development server, enabling quick testing without deploying to a public server.
This article introduces a reusable Java template that leverages EasyExcel v3.3.2 to efficiently export massive backend datasets—such as orders or financial records—to Excel, supporting both multi‑threaded and synchronous modes, pagination, sheet splitting, and customizable query logic, thereby reducing repetitive code and improving performance.
This guide explains why default Nginx logging can fill disks, then walks through disabling logging, clearing old files, re‑enabling logging, using a shell script to rotate logs by date, and scheduling the script with cron to keep server storage healthy.
Learn step‑by‑step how to install, configure, and launch an NFS server on CentOS 7, set up shared directories, edit export rules, adjust firewall settings, and mount the share on client machines, enabling reliable network file sharing for distributed and containerized environments.
This guide walks beginners through Git fundamentals, covering installation, configuration, core commands, IDE integration, common workflows, and advanced operations like rebasing, resetting, and handling detached HEAD states, empowering developers to use version control confidently.
This article explains how to use SLF4J's MDC with Logback to assign a unique trace ID to each request, propagate it across threads and services, and configure log patterns so that logs become fully traceable for easier debugging in distributed systems.
This tutorial shows how to use Javax Validator annotations to simplify backend service interfaces, covering basic, collection, date, enum, conditional, group, and custom validations with complete Maven dependencies and example code, plus handling of validation exceptions.
