This article explains why and how to use Maven's dependency:analyze command in IntelliJ IDEA to identify used undeclared and unused declared dependencies, offering practical steps, risk considerations, and tips for maintaining clean Java backend projects.
This article presents a continuously updated collection of over 90 practical Spring Boot 3 examples, covering request/response access, ThreadLocal handling, async interceptors, request metadata extraction, custom type converters, 404 error handling, and related source code to help developers build robust backend services.
This article presents twenty practical Python scripts that automate everyday tasks such as batch file renaming, email sending, scheduling reminders, generating reports, backing up files, updating Excel sheets, downloading web pages, filling forms, extracting PDF text, converting file formats, visualizing data, and more, providing ready-to-use code examples for each.
The article explains how to enforce single‑device login in web apps by contrasting token‑version control—incrementing a version field in the database and embedding it in JWTs to invalidate older tokens—with a WebSocket‑based method that pushes real‑time logout messages, comparing their trade‑offs and suggesting a hybrid solution.
This comprehensive guide explores ten critical backend optimization strategies—from defensive validation and batch N+1 query elimination to asynchronous processing, parallel execution, caching, connection pooling, compression, message queuing, and design patterns—providing practical examples, Go code snippets, and best‑practice insights to boost performance and reliability.
This article explains how using Arrays.asList() to convert an array into a List creates a fixed‑size collection that throws UnsupportedOperationException on add or remove operations, illustrates the issue with a real e‑commerce incident, and shows how to safely wrap the result with a mutable java.util.ArrayList.
This guide explains how to install the PHP Imagick extension and use its Imagick class to load an image, adjust its brightness, saturation, and hue with modulateImage, and then save or output the modified image, providing complete example code.
PHP 8.4 introduces Property Hooks, a powerful feature that replaces traditional getters and setters with concise, type‑safe syntax, offering simplified code, enhanced encapsulation, automatic validation, and performance gains, illustrated through banking and e‑commerce pricing examples and practical implementation guidelines.
This article explains how to create custom Java class loaders by extending java.lang.ClassLoader, when to override findClass versus loadClass, demonstrates both adhering to and breaking the parent delegation model with complete code examples, and discusses common scenarios such as web servers, SPI, and hot deployment where the delegation mechanism is intentionally altered.
This article introduces the Hutool Java utility library, showing how to install it via Maven and demonstrating 17 commonly used utility classes with code examples that simplify type conversion, date handling, JSON processing, string manipulation, reflection, encryption, validation, and more for backend developers.
This guide explains why Maven dependency analysis is essential, shows how to run mvn dependency:analyze, interprets warnings about used undeclared and unused declared dependencies, and offers practical tips for when and how to clean up your project's pom.xml safely.
This article details how a logistics company's platform adopted Netflix Conductor to unify and scale algorithmic task scheduling, addressing challenges such as fragmented workflows, resource imbalance, and long-running jobs by implementing dynamic DAGs, fork‑join patterns, and robust retry mechanisms, resulting in significant performance gains.
This article walks senior Java developers through MyBatis fundamentals, core components, result mapping, the trade‑offs between #{} and ${}, dynamic SQL, second‑level caching, batch inserts, plugin creation, thread‑safety concerns, and concrete interview‑question solutions, all illustrated with real code snippets and performance numbers.
This article explains the Facade design pattern, its purpose of simplifying complex systems, outlines its benefits and UML structure, and demonstrates a complete Spring Boot example that encapsulates flight, hotel, and package services behind a BookingFacade for a travel‑booking application.
The author explores how DeepSeek V3 can assist in designing a task scheduling system's sharding logic, describing system components, slot allocation, and the AI's step‑by‑step code generation, analysis, and testing process.
This article announces a Spring Boot 3 case collection with 90 permanent examples, then walks through extending Spring Security login to include domain verification by defining a User entity, repository, custom filter, security configuration, Thymeleaf login page, controller, and test endpoint, complete with code snippets and screenshots.
MapStruct is a compile‑time Java annotation processor that automates bean mapping, offering concise, high‑performance, type‑safe conversions, and advanced features such as expression mapping, qualifiedByName methods, null‑value strategies, and decorators, with full IDE support and illustrative code examples.
This article presents twelve practical MyBatisPlus optimization techniques—including avoiding isNull, specifying select fields, batch operations, using EXISTS, safe ordering, LambdaQuery, between, index‑aware sorting, pagination, null‑handling, performance tracking, enum mapping, logical deletion, and optimistic locking—to help Java developers write cleaner, more efficient backend code.
This article introduces the LiteFlow rule engine, explaining its architecture, supported rule file formats, component types, EL rule definitions, data context handling, configuration options, and demonstrates its application in an e‑commerce order processing scenario, highlighting hot‑deployment and performance benefits for Java backend development.
Based on 20 years of Java experience, this article evaluates Java technologies like JSP, Struts, Hibernate, and Servlet against practical use, depth of understanding, and interview relevance, recommending which to drop, which to master, and highlighting alternatives such as Spring MVC and MyBatis.
This article outlines ten common PHP development errors—ranging from missing input validation and error handling to outdated versions, insecure session management, and lack of performance optimization—and provides practical recommendations to avoid them and keep applications robust.
Network ports are numeric endpoints that let operating systems direct traffic to the correct service, with standard values like 80 for HTTP, 443 for HTTPS, 22 for SSH, and others such as 3306 for MySQL, enabling developers to configure custom ports while browsers often hide these defaults for user convenience.
This article deep‑dives into Spring Boot’s inner workings, explaining why dependency versions are omitted, how the spring‑boot‑starter‑parent and spring‑boot‑dependencies manage libraries, and how the composite @SpringBootApplication annotation orchestrates @SpringBootConfiguration, @EnableAutoConfiguration, and @ComponentScan to achieve seamless auto‑configuration and rapid application startup.
This article explains why developers often insert the always‑true condition 1=1 in SQL, examines its potential performance and readability drawbacks, and demonstrates cleaner alternatives using MyBatis dynamic tags and Entity Framework to build conditional queries without unnecessary predicates.
This article explains PHP generator functions introduced in PHP 5.5 and enhanced in PHP 7, demonstrating how to implement infinite iterable objects such as a Fibonacci sequence, and discusses their advantages for processing large data sets, memory efficiency, and typical use cases like log handling and pagination.
Despite long‑standing criticism that PHP is outdated, slow, and cumbersome, the article explains why the language still matters and how FrankenPHP—a Go‑based server—injects modern performance, deployment simplicity, and future‑ready features to revitalize PHP for contemporary web development.
Cloudflare built Pingora, a Rust‑based HTTP proxy that processes over a trillion daily requests, delivering lower latency, higher connection‑reuse, and up to 70% CPU and memory savings compared to Nginx, while adding extensible features and stronger memory safety.
This chapter explains how to build a Java-based performance testing engine by dissecting common testing requirements, illustrating queue and throttling models through a supermarket analogy, and presenting thread‑based and TPS‑based designs with code examples and future extensions.
This article explains Spring Boot 3 bean destruction techniques—including DisposableBean, @PreDestroy, @Bean destroyMethod, AutoCloseable, and custom inference—provides complete code examples, and announces a continuously updated Spring Boot 3 case collection PDF for developers.
This article explains the concept of plugin mechanisms in Java and Spring Boot, covering benefits, common implementation approaches such as ServiceLoader and custom configuration, detailed code examples, and practical guidance for building extensible backend systems.
This article introduces PHP classes as object blueprints, explains why they improve code organization, reusability, maintainability, and security, and provides concrete PHP 8.4 examples such as Product, ShoppingCart, User, Order, and best‑practice guidelines like SRP, encapsulation, and type safety.
This article explains why ConcurrentHashMap is ideal for high‑concurrency caching, outlines its key features, and provides step‑by‑step Java examples—including a basic in‑memory cache, an expiring cache, and an auto‑loading cache—plus a recommendation to use Caffeine for production workloads.
This article introduces the open‑source JSQLParser library, shows how to set it up in a Spring Boot 3 project, and provides step‑by‑step code examples for simple parsing, extracting tables, retrieving WHERE clauses, building or modifying SQL statements, and handling parsing errors.
This article provides a comprehensive technical walkthrough of KafkaConsumer, covering Java configuration code, delivery semantics (at‑most‑once, at‑least‑once, exactly‑once), offset commit strategies, rebalance mechanisms, partition assignment algorithms, thread‑safety concerns, and internal poll implementation, followed by unrelated promotional content.
This article explains the fundamentals of PHP session management, covering how sessions store and transmit user data across pages, essential functions like session_start() and $_SESSION, practical code examples, and common pitfalls to avoid for secure and efficient web applications.
Spring Security 7.0 drops the traditional chain‑style configuration in favor of a new Lambda DSL, offering clearer hierarchy, type safety, and IDE support; the article explains the breaking change, compares old and new syntax, provides migration examples, and shares tips for custom DSLs and WebFlux security.
This article explains how Java's ThreadLocal provides thread‑specific storage, enabling safe context management across thread pools, web request handling, database connections, logging, and global data propagation, thereby preventing interference and improving concurrency performance.
This tutorial walks you through creating a Spring Boot project, defining a REST controller, running the application, testing the endpoint, expanding CRUD methods, configuring properties, and optionally adding service and repository layers, all with clear code examples.
This course introduces the background and features of PHP, explains the inner workings of the PHP interpreter—including lexical analysis, parsing, and the virtual machine—and guides students through implementing these components in C to create a simple interpreter while enhancing their programming and problem‑solving skills.
MyBatis-Plus, an enhanced toolkit for MyBatis, simplifies CRUD operations and injects dynamic SQL, and this release introduces numerous bug fixes, new annotations, code‑generator enhancements, and upgrades to MyBatis, Spring Boot, and Kotlin, with important migration notes for developers.
This article explains how to track online users by storing their identifiers in a Redis sorted set, using expiration timestamps as scores, and demonstrates adding, querying, and cleaning up entries with ZADD, ZRANGEBYSCORE, ZREMRANGEBYSCORE, and ZREM commands in both Java and JavaScript.
This article explains Java's ThreadLocal mechanism, detailing its internal ThreadLocalMap structure, core set/get/remove operations with full code examples, and demonstrates how multiple ThreadLocal variables are stored per thread, providing a clear understanding of thread‑local storage in backend development.
This article provides a thorough guide on API (interface) fundamentals, design principles, optimization techniques, security measures, and maintenance practices, offering practical examples and code snippets for building robust, high‑performance modern backend services.
This article explains how to build a flexible, scalable permission control system in Java using custom annotations and Spring AOP, covering basic concepts, system requirements analysis, database schema design, annotation definitions, aspect implementation, and business logic services for comprehensive access management.
This article compares Server‑Sent Events, WebSocket, and traditional polling, explains why SSE can replace heavyweight WebSocket in one‑way push scenarios, provides configuration and code examples for Spring Boot, and shares practical lessons from real project experiences.
This article introduces the major PHP 8 enhancements—including JIT compilation, named parameters, improved anonymous classes, and loose type checking—explaining each feature and providing clear code samples to help developers adopt them for more efficient and readable backend code.
This course teaches developers with Go experience how to design and implement GraphQL APIs, covering fundamentals, server construction, request handling, schema definition, and practical deployment techniques to enhance data interaction flexibility and efficiency.
This article explains why the traffic team switched from traditional MQ to Redis Stream, covering the underlying concepts, design choices, implementation details, load‑balancing strategies, cross‑datacenter handling, monitoring metrics, performance benchmarks, and practical lessons learned.
This article explores why excessive try‑catch blocks clutter PHP code, compares a messy controller implementation with a clean version, explains PHP exception fundamentals, and demonstrates how to centralize error handling in Webman using a custom TinywanHandler with practical configuration and examples.
This article details a practical experiment using SpringBoot 2.5.4 and JMeter to measure the heap memory allocated by individual HTTP and RPC requests, analyzes GC logs, and demonstrates how request size and logging affect memory consumption, providing insights for backend performance optimization.
This article explores the practical application of Domain‑Driven Design and hexagonal architecture in a real‑world CRM system, detailing strategic and tactical design, module division, code examples, and a step‑by‑step migration from a traditional layered architecture to a more flexible, maintainable backend solution.
This article examines gRPC’s implementation principles, its multi‑language support, Protocol Buffers integration, performance advantages, and limitations such as browser compatibility, while providing a C++/Go demo that showcases cross‑language RPC calls and a detailed project structure.
This article explains the fundamentals of network I/O, covering hardware basics, process scheduling, blocking and non‑blocking models, multiplexed I/O techniques such as select/poll/epoll, asynchronous I/O, socket types, and the user‑kernel boundary, providing a comprehensive guide for backend developers.
This article explains the PHP cURL extension's curl_setopt() function, covering its syntax, parameter meanings, boolean return value, and provides a complete example that demonstrates setting URL, request method, response handling, timeout, error checking, and session closure.
This article explains how to integrate NativePHP technology into a Laravel project to build desktop applications, covering the creation of a Laravel base, setting up entry files, defining routes and controllers, using PHP's OS functions, and providing complete code examples.
This article explains the purpose, basic methods, best‑practice usage, and typical scenarios of Java's CountDownLatch utility, providing code examples and a comparison with Thread.sleep to help developers synchronize multiple threads effectively.
This article details a week‑long investigation of intermittent Nacos service deregistration in a Spring Cloud Alibaba microservice environment, describing the background architecture, multiple hypothesis tests, diagnostic commands, kernel version mismatch, and the final fix by upgrading the Linux kernel.
This article explains how to use Maven plugins to build a Spring Boot project into an executable JAR, separate its dependencies into a lib folder, and create a Docker image that copies those libraries, enabling clean deployment of Java backend services.
This article explains how to create a custom annotation and a MyBatis‑Plus interceptor that automatically injects data‑permission SQL conditions based on the current user's role, showing both a basic implementation and an advanced version with role‑based scope handling, complete with code examples and integration steps.
This article demonstrates how to build a dynamic IP blacklist using Nginx, Lua scripts, and Redis, covering requirements, environment setup, design options, nginx.conf configuration, detailed Lua code, summary of advantages, and extensions such as use cases and advanced features.
This article explains how to print numbers from 1 to 100 with two Java threads—one handling odd numbers and the other even numbers—by first using a synchronized block with wait/notify and then by employing Semaphore for thread coordination.
This guide presents comprehensive best‑practice recommendations for building APIs—defining clear contracts, applying six design principles, optimizing performance through batching, async and caching, enforcing robust security with encryption, signing and rate‑limiting, and ensuring long‑term maintainability via versioning, documentation and structured logging.
This article explains Go's Context concept, its role in managing Goroutine lifecycles, the standard library's context package API, how to create and cancel contexts, share values safely, and best practices for using Contexts in concurrent backend applications.
This article explains OAuth2.0 fundamentals, outlines its roles and grant types, and provides step‑by‑step Spring Boot code to build an authentication server, configure security, set up a resource server, and test the full authorization flow with token handling.
This article explains Spring Boot’s asynchronous processing mechanism, covering its purpose, the @Async annotation, configuration steps, custom thread pool setup, handling return values, and typical use cases, enabling developers to improve performance and responsiveness in backend applications.
This article outlines essential practices for improving PHP function performance, including avoiding inline variables, reducing parameter count, declaring parameter types, leveraging built‑in functions, caching results, using static variables, and steering clear of eval(), complemented by a practical optimization case study.
This article explains how function caching in PHP—using mechanisms such as OPcache, APC, and Zend Opcache—can improve application performance, provides a practical example of enabling OPcache, and outlines additional optimization strategies like using Redis, optimizing database queries, reducing memory usage, and efficient image processing.
This article walks readers through upgrading from Java 11 to the Java 21 LTS by explaining the six‑month release cadence, JEP process, and SDKman setup, then demonstrates practical code examples for twelve new features—including preview Unnamed Classes, String Templates, Scoped Values, Structured Concurrency, Vector API, Virtual Threads, and Generational ZGC—highlighting their motivations, benefits, and production considerations.
This article examines a real‑world incident where oversized and frequently accessed Redis cache keys caused cache penetration and network bandwidth saturation during a high‑traffic promotion, analyzes the underlying reasons, and presents concrete solutions and preventive measures for backend systems.
The article analyzes why backend programmers often become technical leaders, highlighting their global architectural perspective, deep problem‑solving skills, and strong cross‑team communication, while also noting scenarios where frontend leaders excel in interaction‑focused projects.
Spring AI now supports the Model Context Protocol (MCP), a universal adapter that lets AI applications seamlessly read databases, files, and APIs, offering a plug‑and‑play alternative to function calling, with simple Maven setup and code examples to get started quickly.
This article introduces a Spring Boot 3 case collection and then provides a comprehensive tutorial on using Apache Commons Chain, covering its core interfaces, basic and advanced usage, resource release, catalog management, exception handling, and integration with Spring Boot.
This article provides a step‑by‑step tutorial on using Maven for Java backend projects, covering repository configuration, basic POM structure, dependency declaration, scope handling, exclusion, variable properties, multi‑module management, dependencyManagement, and common build plugins such as jar, assembly, and shade.
This article introduces Spring's SseEmitter for server‑sent events, outlines its key features and use cases, and provides a complete end‑to‑end example—including Vue 3 front‑end setup, JavaScript client, and Spring Boot controller code—to enable real‑time message pushing between server and browser.
This article explains why Java's BigDecimal can guarantee lossless precision in financial calculations by examining its class definition, internal fields, example usage, and the detailed implementation of its add method, including scaling and long‑integer arithmetic.
This article highlights seven often‑overlooked Spring Boot 3 details—ranging from dependency injection and controller design to configuration, constructor simplicity, environment profiles, exception handling, and response handling—providing concrete code examples and best‑practice recommendations to improve code quality and maintainability.
This article explains six typical techniques—@RequestParam, @PathVariable, @MatrixVariable, @RequestBody, @RequestHeader, and @CookieValue—for extracting request data in Spring Boot APIs, providing usage scenarios and concrete code examples for each method.
The article explains how Go 1.24 finally enables type aliases to have their own generic type parameters, provides background on the previous limitation, demonstrates usage with concrete code examples, and notes the experimental flag required in Go 1.23.
The team concluded that adopting Domain‑Driven Design can be valuable, but only when a company can afford the upfront investment, has a shared language and cross‑department collaboration, possesses strong OOP expertise, and maintains a culture supportive of the required organizational change.
This article explores the role of WebSocket in IoT, detailing its advantages over HTTP, comparing Java implementations, presenting a Netty‑based architecture for smart devices, and providing complete code examples for connection handling, authentication, and message processing to achieve real‑time communication.
This article provides a comprehensive overview of Domain-Driven Design (DDD), explaining its core principles, layered architecture, domain model components such as entities, value objects, aggregates, and bounded contexts, and includes Java code examples to illustrate implementation.
This article explains the lightweight Server‑Sent Events (SSE) approach for one‑way server push, compares its features, connection model, performance and use cases against WebSocket and traditional polling, and provides a SpringBoot example with code snippets for building an online‑user SSE endpoint.
This tutorial introduces Spring Cloud Gateway, explains its core features and Actuator integration, and provides step‑by‑step practical examples for viewing routes, global filters, route filters, refreshing routes, managing routes via REST endpoints, creating and deleting routes, and sharing routes with Redis, all accompanied by code snippets and configuration details.
This article provides a step‑by‑step guide for developers to implement map zoom functionality in web applications using the AMap (Gaode) API with PHP, covering API key acquisition, library inclusion, map instance creation, container setup, zoom level configuration, control addition, and final display.
This article explains how Nginx’s performance‑oriented design, high stability, mature codebase, and versatile features such as load balancing, reverse proxy, and caching have made it the leading web server worldwide, with widespread adoption by major Chinese internet companies and detailed configuration guidance.
This article presents twelve practical MyBatisPlus optimization techniques—including avoiding isNull checks, specifying select fields, batch operations, using EXISTS, safe ordering, LambdaQuery, between, index-aware sorting, pagination, null handling, performance tracking, enum mapping, logical deletion, optimistic locking, and increment/decrement—to write cleaner, faster, and more maintainable backend code.
This article presents a systematic experiment that uses JMeter to generate HTTP requests against a SpringBoot 2.5.4 service, records detailed GC logs, and calculates that each HTTP call consumes roughly 34 KB of heap memory, while logging and payload size can significantly increase the allocation.
This guide explains the repository pattern for Laravel, detailing its benefits, step‑by‑step implementation for an e‑commerce product management module—including model, interface, repository, controller code—and offers best practices, caching tips, and common pitfalls to improve code structure, maintainability, and testability.
This article compares Java and Go across syntax simplicity, type systems, object‑oriented features, pointers, error handling, concurrency, reflection, and community culture, providing concrete code examples and practical insights to help Java developers transition smoothly to Go.
This article introduces Apache ShenYu, a high‑performance, visual API gateway, walks through Docker‑based installation of its admin and bootstrap containers, demonstrates HTTP proxy and address‑rewrite configuration for a SpringBoot e‑commerce project, and shows how to enable rate‑limiting using the built‑in plugins.
This article explains how to prevent duplicate order submissions in e‑commerce systems by using a token mechanism and Redis‑based distributed locks within a Spring Boot backend, detailing the workflow, code implementation, and best‑practice optimizations for idempotent processing.
This guide explains the essential proxy concepts for Python web scraping, covering what proxies are, common types, how they protect crawlers, practical usage with the requests library, and the role of proxy pools in improving scraping efficiency.
This article proposes an asynchronous timeout implementation for CompletableFuture in JDK 8, addressing the lack of built-in timeout interruption capabilities and providing a solution for precise task timeout control.
This article explains why JDK 8's CompletableFuture lacks built‑in timeout interruption, analyzes common usage patterns and their limitations, and presents a custom asynchronous timeout solution that works in both JDK 8 and JDK 9 environments, complete with reusable utility code.
This article explains what PHP built-in objects are, categorizes them by request handling, file operations, database access, and exception handling, and demonstrates their usage with code examples to write more elegant, secure, and efficient backend code.
This tutorial walks new Go developers through naming a project, initializing a module, creating the essential directory layout and files, adding tests, and building a simple CLI while emphasizing Go's KISS and YAGNI principles.
This guide walks you through Tomcat’s overview, multiple installation methods, essential configuration files, port settings, virtual‑host setup, and how to combine Tomcat with Nginx for static‑dynamic separation, providing a complete Linux‑based deployment workflow.
This article explains how to replace a paid map service with the free Tianditu API by implementing reverse geocoding, nearby and text search, and coordinate system conversion in Java, providing complete code examples and practical considerations for cost‑effective map integration.
This tutorial guides readers through installing Nginx, configuring the server, creating a simple HTML page, launching the service, and using a free tunneling tool to expose the site externally, providing a cost‑free way to set up a personal web server.
This tutorial explains how Spring's DataBinder binds request parameters to objects, demonstrates practical code examples for successful and erroneous bindings, shows how to add custom validation, set required fields, and customize error codes for clearer user feedback.
