Learn how to efficiently convert between PO, VO, and DTO objects in Java using Spring BeanUtils for identical fields and MapStruct for custom mappings, including single objects, lists, and merging multiple sources, with full Maven setup and generated implementation details.
This tutorial explains how to define, implement, and throw custom Java exceptions, providing complete example code, step‑by‑step creation instructions, and a practical demo that integrates the custom exception into a JSON‑processing method.
This article examines Meituan's evolution from hard‑coded validation to a custom rule‑engine framework, detailing case studies of store information checks, audit workflows, and performance metric calculations, and explains the design of the Maze framework that separates business logic from system code while improving maintainability and scalability.
This article explains how to enable and use Spring Boot's graceful shutdown feature in version 2.3, including configuration of the embedded web server and Actuator, and also provides a custom solution for older Spring Boot releases to achieve smooth termination of ongoing requests.
This article outlines a five‑stage Laravel learning path, covering simple CRUD operations, database factories and seeders, form validation with request classes, browser automation testing with Dusk, and the application of design patterns to build robust backend applications.
Through a 30‑minute Apache JMeter load test on the Spring Boot Petclinic sample, we captured heap dumps and used HeapHero to reveal that 65% of memory is wasted due to string duplication, inefficient collections, and poor initialization, offering concrete code‑level recommendations to improve memory efficiency.
This article surveys the Laravel ecosystem, highlighting that over 7,176 extensions exist and presenting the 100 most‑downloaded packages, each with a brief description of its functionality, to help developers choose tools that streamline coding and improve productivity.
Marking its 25th anniversary in June 2020, PHP has shed its legacy reputation by dramatically improving performance with PHP 7.4, introducing features like FFI and preloading, adopting Composer for package management, and enhancing security, while hinting at future developments such as PHP 8.0.
This article explains practical API security techniques for protecting data exchange with third‑party systems, covering token generation and storage, timestamp validation to mitigate DoS attacks, MD5‑based request signing with nonce, preventing duplicate submissions using Redis, and illustrates the concepts with comprehensive Java code examples.
This guide shows how to run a Dockerized FTP server, configure its network and ports, install the PHP ftp-client library, and use PHP code to upload and download files through the containerized service.
This article explains how Spring Boot 2.3 implements graceful shutdown, showing configuration properties, code examples, container-specific behaviors, and how to trigger shutdown via the actuator endpoint, while also noting differences among Tomcat, Reactor Netty, and Undertow.
This article explains how Swoole's multi‑process model isolates memory in PHP, recommends external storage such as Redis or shared memory via Swoole/Table, details capacity calculations, handling of oversized strings, and provides a complete PHP example demonstrating table creation, data storage, and server communication.
This article walks through a complete Go implementation of a food recommendation API using Domain-Driven Design, covering project setup, layer separation, entity and repository definitions, infrastructure configuration, application services, HTTP interfaces, authentication, and how to run the application.
This tutorial introduces Go's core concepts—including package structure, built‑in types, variable and constant declarations, and function definitions—explaining syntax nuances, import styles, type creation, and initialization patterns to help beginners quickly become productive in Go.
This article introduces fifteen Alibaba open‑source and commercial developer tools—including Arthas, Cloud Toolkit, ChaosBlade, ARMS, Docsite, Freeline, PTS, and more—detailing their core functions, typical usage scenarios, tutorial links, and acquisition methods to help backend engineers boost productivity and reliability.
This article explains the core benefits, essential design principles, and common limitations of microservice architecture, offering practical guidance on functional scope, cohesion, API integration, data isolation, traffic management, automation, and monitoring to help teams build scalable, resilient software systems.
This article presents a comprehensive distributed retry system that leverages a distributed scheduling mechanism to ensure eventual consistency, reduce manual recovery costs, and provide flexible retry strategies, automatic recovery detection, visual management, rate limiting, and intelligent retry for backend services.
This article presents comprehensive Java code optimization techniques, emphasizing error avoidance, reduced code size, and improved execution efficiency through practices such as using final modifiers, object reuse, local variables, proper resource handling, appropriate data structures, bitwise operations, and careful use of collections and concurrency utilities.
This tutorial demonstrates how to build a WebSocket server using PHP's Swoole extension and a corresponding HTML/JavaScript client, covering protocol basics, server-side event handling for connections, messages, and closures, and showing the complete code and execution results for real‑time bidirectional communication.
The Beijing Elixir Meetup featured four technical talks covering Rust integration with Elixir, an introduction to Phoenix LiveView, deep dives into bits, bytes, strings and emojis in Elixir, and using FoundationDB within the Erlang/Elixir ecosystem, all accompanied by detailed slide links and a lively Q&A session.
This article outlines the key characteristics of large‑scale web systems and walks through their architectural evolution—from monolithic beginnings to service separation, caching, clustering, read/write splitting, CDN/reverse‑proxy acceleration, distributed storage, NoSQL, business splitting, and distributed services—while highlighting core values and common design pitfalls.
This article introduces Swoole, a production‑grade asynchronous network engine for PHP, outlines the required prerequisites, shows a quick PECL installation, explains how to enable the extension in php.ini, and provides a complete example of building and testing a simple HTTP server.
The article explains how traditional Java web projects that bundle JSP, static assets, and business logic into a single WAR cause performance and scalability issues, and advocates separating front‑end static resources from back‑end services to achieve true decoupling, better fault tolerance, and easier horizontal scaling.
This article explains the principles and practical implementation of WebSocket, compares it with HTTP, discusses when to use it, and details a complete backend and frontend solution using Spring WebSocket, SockJS, and STOMP for real‑time communication in web applications.
This article explores common caching read/write patterns—including Cache‑Aside, Read‑Through/Write‑Through, Write‑Back, and Write‑Around—detailing their mechanisms, advantages, disadvantages, and suitable application scenarios, while also addressing consistency and thread‑safety concerns. It also provides practical guidance on handling cache misses and ensuring data integrity across distributed systems.
This article explains how Spring handles circular dependencies in singleton beans by using a three‑level cache, contrasts it with prototype beans that cannot participate, and demonstrates a minimal implementation that mimics Spring's approach, linking the concept to the classic two‑sum algorithm.
This article outlines what middleware development entails, the essential technical and professional qualities required, various types of middleware, and a step‑by‑step learning roadmap for Java developers aiming to break into middleware engineering.
This guide explains how to configure Laravel for read/write database separation and set up Nginx load balancing, covering hardware requirements, Laravel config/database.php adjustments, Nginx upstream strategies, detailed server blocks, and essential parameter explanations for a scalable web architecture.
This tutorial demonstrates how to leverage IntelliJ IDEA's diagram feature to view, clean up, and enrich the inheritance and interface implementation hierarchy of Java Servlet classes, including removing irrelevant nodes, inspecting class members, adding new classes, and jumping to source code.
This article explains how Tomcat, a popular Java web server and servlet container, handles incoming HTTP requests by providing socket services, distributing URLs to web applications, encapsulating request and response objects, and invoking servlet classes, illustrated with step‑by‑step screenshots of a simple implementation.
The April 22 release of Alibaba’s Java Development Manual “Taishan” edition introduces five mandatory date‑time rules, two table‑alias SQL conventions, and a unified error‑code standard, all aimed at improving code consistency and reliability across backend projects.
This article explains Netty's channel pipeline lifecycle—including how the responsibility chain is created during channel initialization, how handlers are added and removed, and how the pipeline is torn down during channel closure—while providing detailed source‑code excerpts and diagrams to illustrate each step.
This article explains what Spring Boot application starters are, describes how they simplify adding modules like Tomcat and Redis through Maven dependencies, and provides a detailed list of all 44 available starters with their primary functions for backend Java development.
This article compiles a comprehensive set of PHP interview questions covering fundamentals, session and cookie handling, database transactions, MySQL optimization, version control tools, string manipulation, HTTP status codes, MVC concepts, and practical coding tasks with detailed answers and code examples.
This article walks through seven practical Laravel techniques—including view composers for reusable sidebars, route naming for maintainable URLs, dynamic key‑value settings, concise database query shortcuts, polymorphic relationships, caching best practices, and separating Redis connections—to help developers write cleaner, more scalable backend code.
Architecture patterns provide reusable solutions, and this article explains the Pipe‑Filter pattern—where data passes through independent filters like a production line, used in web frameworks, compilers, and serverless functions—and the Microkernel pattern, which separates a minimal core from plug‑in modules to enhance extensibility, maintainability, and configurability.
This article explains Java's ThreadLocal mechanism, shows how it provides thread‑confinement without synchronization, analyses its source code—including hash generation, internal ThreadLocalMap structure, set/get operations and resize logic—highlights potential memory‑leak pitfalls, and lists common application scenarios.
Discover the newly released Java Development Handbook (Taishan edition) featuring 34 new guidelines, solutions to Stream Collectors toMap pitfalls, unified error‑code design, leap‑year date bugs, SQL aliasing tricks, and code‑formatting tips, plus free download links and a chance to win prizes.
This cheat sheet introduces Composer, the PHP dependency manager, explains its purpose, and provides a concise list of essential Composer commands for creating projects, installing and updating packages, optimizing autoload files, self‑updating, requiring packages globally, and displaying package information.
This article provides a comprehensive overview of Laravel, covering its definition, advantages over other PHP frameworks, core components such as migrations, facades, service container, Eloquent models, events, query builder, route naming, closures, testing techniques, traits, autoloading, generators, and various PHP language features with practical code examples.
This guide explains how to replace per‑task Cron entries with Laravel's unified scheduler, showing how to configure a single Cron line, define schedules in app/Console/Kernel.php using closures, invokable objects, Artisan commands, queue jobs, shell commands, and how to fine‑tune frequency, time windows, environment, timezone, overlapping, single‑server execution, background processing, maintenance mode, output handling, hooks, and URL pings.
This article introduces the Hutool Java utility library, describes its main modules such as encryption, HTML handling, and cron scheduling, and provides practical code examples demonstrating how to use SecureUtil, HtmlUtil, and CronUtil to simplify backend development tasks.
This guide walks you through creating a simple PHP extension, from generating the skeleton with ext_skel.php to understanding each generated file—config.m4, config.w32, php_test.h, test.c, and tests—so you can confidently build and install your own extension.
This article shares practical techniques for handling date and time in Spring Boot projects, including the pitfalls of using SimpleDateFormat, the benefits of @JsonFormat, and two approaches to global configuration that streamline formatting for both java.util.Date and java.time types.
This article explains how Laravel Eloquent returns Collection objects, demonstrates iterating and chaining collection methods such as reject and map, lists the extensive base collection API, and shows how to create custom collections by overriding the newCollection method in a model.
A 2020 survey of 1,113 Node.js developers, conducted by Ecma members and led by Alibaba and Tencent, reveals demographic trends, preferred languages, frameworks, tools, deployment practices, learning habits, and future interests, providing a comprehensive snapshot of the Node.js ecosystem.
This guide explains how Laravel's paginator integrates with the query builder and Eloquent ORM, shows basic and simple pagination methods, demonstrates manual paginator creation, customizing URIs, appending parameters, converting results to JSON, and customizing pagination views, all with code examples compatible with Bootstrap.
This article provides an extensive Spring Boot tutorial covering its core concepts, annotations, configuration methods, security mechanisms, monitoring tools, third‑party integrations, deployment options, and common interview questions, offering Java developers a complete reference for building and maintaining modern backend applications.
Learn how Tomcat, the popular Java web server and servlet container, processes requests—from socket handling and URL dispatching to request/response encapsulation, servlet lifecycle, configuration, and startup—through a detailed 7‑step guide with illustrative code snippets and diagrams.
This article demonstrates step‑by‑step how to construct a clean and standardized backend API in Spring Boot by introducing required dependencies, using Validator for request parameter checks, applying global exception handling, defining custom exceptions, and implementing a unified response format for both success and error cases.
This article explains the best practices for using parameters and query strings in REST API design, covering pagination, parameterization concepts, HTTP methods, headers, caching, and authorization, and provides guidance on choosing the right approach to create efficient, stateless, and scalable APIs.
This article shows backend developers how to use PyCharm Professional’s integrated Database tool and HTTP Client to connect to MySQL, perform visual CRUD operations, and test RESTful APIs directly within the IDE, eliminating the need for separate tools like Navicat and Postman.
This guide walks you through installing Java 1.8, configuring Maven with Alibaba mirrors, setting up IDEA for Maven builds and Lombok, and installing VSCode with a collection of useful extensions to create a complete Java development workspace.
This article presents a practical guide to designing a usercenter module for API testing in Java, detailing a maintenance‑free data strategy, key automation principles, and a full code example that demonstrates user info retrieval, password modification, avatar upload, and feedback handling, with a Gitee repository link.
This article explains how to build a real‑time internet gold investment platform by outlining gold’s financial characteristics, identifying key participants, describing the three‑pillar system architecture, detailing buy, sell, withdraw and gift workflows, and presenting the necessary database tables for robust transaction and reconciliation management.
This article compiles sixteen practical Spring Boot best‑practice recommendations—ranging from custom BOM management and auto‑configuration to test slicing and externalized configuration—drawn from years of professional experience and expert insights, to help developers build cleaner, more maintainable micro‑service applications.
This tutorial walks through what Spring Boot Actuator is, how to quickly create a demo project, configure endpoint exposure, explore essential endpoints such as health, metrics, loggers, and shutdown, and secure them with Spring Security, providing code snippets and configuration examples.
This article explains the REST architectural style, its fundamental concepts, the most important HTTP methods, response‑code categories, the Richardson maturity model, description languages, popular server frameworks and client tools, while providing concrete examples and RFC references for building robust web APIs.
This article provides a detailed overview of common Spring Boot, Spring MVC, and JPA annotations—including their purposes, usage patterns, and code examples—helping developers understand how to configure, map, and manage beans, controllers, and persistence in Java backend applications.
This article explains how Nginx implements load balancing, covering algorithms like round-robin and IP hash, and provides a practical setup guide using Node.js and Nginx.
This article introduces how backend developers can leverage PyCharm Professional’s integrated Database tool and HTTP Client to manage databases and test RESTful APIs directly within the IDE, eliminating the need for separate tools like Navicat and Postman.
This article introduces JDK RMI, explains its role in distributed Java applications, provides complete Maven project examples for interface, server, and client implementations, and details the underlying registry, stub, skeleton, and export mechanisms that enable remote method calls.
Spring Framework 5.2.5 introduces over 50 bug fixes and enhancements, adds Java 14 support, and brings a host of new capabilities such as improved multipart handling, better Kotlin bean support, enhanced WebClient features, and performance optimizations for caches and proxies.
This article introduces FastAPI, a modern high‑performance Python web framework, walks through installation, basic routing, async handling, query and path parameters, data modeling with Pydantic, template rendering with Jinja2, and compares its speed to Flask, providing complete code examples and screenshots.
This guide outlines a comprehensive learning path for C and C++ covering essential language concepts, core computer science fundamentals, practical Linux development tools, and recommended resources to help beginners transition into backend development roles.
This article continues the mica-http guide, showcasing how version v1.1.7 introduces enhanced proxy handling, retry mechanisms, page crawling, model integration, and result processing, while providing documentation links, example projects, and open‑source tool recommendations for building lightweight Java crawlers.
Learn how to resolve performance bottlenecks in a Spring‑based mall project by caching user and permission data in Redis, adding cache logic with RedisTemplate, and using AOP to gracefully handle Redis failures, ensuring stable authentication even when the cache is unavailable.
This article explains how permission control is re‑designed for front‑end/back‑end separated applications, defining resources and permissions, outlining the distinct responsibilities of front‑end routing and component rendering versus back‑end API validation, and providing practical implementation examples in React and Java.
This article explains how Spring applies nine classic design patterns—including Simple Factory, Factory Method, Singleton, Adapter, Decorator, Proxy, Observer, Strategy, and Template Method—detailing their implementation approaches, underlying principles, and the benefits they bring to Spring's IoC container and AOP mechanisms.
This tutorial provides a comprehensive introduction to Node.js, covering its runtime environment, core global objects, module system, command‑line interface development, npm package management, script automation, and event handling with practical code examples and explanations for front‑end engineers transitioning to back‑end development.
This article explains how the FanLibrary testing framework provides overloaded methods to create HttpGet and HttpPost objects, supporting JSON, form, and multipart file uploads, with detailed Java code examples and guidance on parameter handling and URL encoding.
This tutorial explains how to download and install the Go language, configure the environment, and introduces popular Go web frameworks such as Beego, Iris, and Buffalo, followed by step‑by‑step instructions for installing Beego and creating a Hello World application.
This article compiles typical Java backend interview questions and detailed answers covering self‑introduction, personal growth, concurrency primitives, JVM memory management, GC tuning, cache design, large‑scale data storage, Spring IoC, AOP, distributed session handling, and common design patterns.
This comprehensive guide walks you through installing Redis on Linux and Windows, configuring Spring Cache annotations, setting up JSON serialization with RedisTemplate, using connection pools, and implementing a flexible RedisService with controller examples, providing all the essential steps to integrate Redis into your Spring Boot applications.
This tutorial walks through preparing a CentOS 7.5 host, installing required dependencies, creating an nginx user, downloading the source, compiling and installing Nginx 1.11.1, configuring the firewall, and using common Nginx commands to start, test, reload, and enable the service at boot.
This article introduces Nginx, compares its high‑performance features and resource efficiency with Apache, explains its core functions such as reverse proxy, load balancing and caching, provides performance test results, and details virtual‑host concepts and types for effective web server selection.
This article introduces the Hutool Java utility library, outlines its core modules such as SecureUtil, HtmlUtil, and CronUtil, provides code examples for encryption, HTML escaping, and task scheduling, and encourages developers to explore its comprehensive set of backend development tools.
Idempotency ensures that repeated execution of an operation yields the same result as a single execution, and this article explains its importance in backend systems, outlines concepts, and presents practical techniques such as unique indexes, token mechanisms, pessimistic and optimistic locks, distributed locks, and API design for reliable, duplicate‑free processing.
This article describes how Ctrip's vacation product system was modernized by migrating from a legacy .NET/SQL Server architecture to a MySQL‑based, front‑end/back‑end separated platform, detailing the challenges, step‑by‑step storage reconstruction, replication elimination, data model splitting, messaging replacement, and overall architectural improvements.
This article analyzes the interference and latency problems caused by traditional service‑level Mock tools in a microservice environment and proposes a four‑component solution—servlet agent, local Mock proxy, Mock server, and configuration client—to isolate Mock functionality, eliminate cross‑application impact, and improve test stability.
This tutorial walks through preparing the development environment, creating a Django project and app in PyCharm, configuring MySQL, adjusting Django's MySQL backend, setting up URL routing, and establishing a folder for file uploads, all illustrated with step‑by‑step screenshots.
This article explains how floating‑point calculations in Java can lose precision, especially for monetary values, and demonstrates using the BigDecimal class—particularly its String constructor—to achieve exact arithmetic in backend applications.
This article explains what Swagger is, why it benefits backend and frontend teams, and provides a step‑by‑step guide to integrate Swagger 2.7.0 into a Spring Boot project, including dependencies, configuration, annotations, controller examples, testing tips, and deployment considerations.
This article curates the ten most starred Java‑related GitHub repositories, summarizing their key features—from interview prep and design patterns to SpringBoot, Elasticsearch, and advanced concurrency—providing developers with essential open‑source resources and highlighting the impact of projects like Dubbo.
This article explains how Spring's @EnableAsync annotation activates asynchronous method execution, detailing the roles of AsyncConfigurationSelector, ProxyAsyncConfiguration, AbstractAsyncConfiguration, and AsyncAnnotationBeanPostProcessor, and showing the underlying code that creates proxies, advisors, and executors for async processing.
This article explains why retry strategies are essential for unreliable external services, introduces the flexible Guava‑Retrying library, provides detailed code examples, describes its core execution flow, shows how to add the Maven dependency, and outlines the key interfaces and strategies for configuring retries.
This article uses school‑class analogies to explain ZooKeeper’s role as a third‑party coordinator, describes its tree‑based data model, and details essential features such as watches, session handling, and ephemeral nodes for building reliable backend services.
A comprehensive survey of Java developers reveals current JDK vendor preferences, payment habits, version adoption, upgrade motivations, language distribution, Spring framework usage, IDE and build tool popularity, code repository choices, and role demographics across the industry.
This tutorial explains how to use Java NIO's FileChannel to acquire exclusive and shared file locks, covering lock types, required channel modes, code examples for FileOutputStream, RandomAccessFile, and FileInputStream, and discusses platform-specific considerations and common exceptions.
This article details the architectural redesign, fault‑tolerance mechanisms, performance optimizations, and monitoring strategies employed in JD.com’s PC homepage, illustrating how backend technologies such as OpenResty, Lua, Redis, and NGINX are orchestrated to achieve high availability and sub‑30 ms page loads.
This tutorial explains how to integrate MyBatis into a Spring Boot project, covering the framework's basics, Maven dependencies, annotation‑based CRUD operations, XML‑based mappings, entity definitions, controller implementations, Swagger testing, and Druid monitoring, with complete code examples and download links.
This article presents a comprehensive collection of Alibaba’s open‑source projects—including Spring Cloud Alibaba, Ant Design, Druid, Dubbo, JStorm, Sentinel, and many others—detailing their core features and providing repository links to help developers build scalable, high‑performance backend and cloud‑native applications.
This article reflects on the redesign of a high‑traffic transaction system, discussing the decision‑making process, programming paradigms, SOLID principles, domain‑driven design, component decomposition, and the evolution from simple state machines to flexible, maintainable backend architectures.
This guide explains how to use Alibaba Cloud Function Compute to create a serverless, elastic backend for mini‑apps, covering the challenges of high‑traffic mini‑programs, the service template workflow, authentication, data access, deployment steps, and client‑side setup.
This article provides a comprehensive beginner-friendly guide to gRPC, covering its definition, the protobuf syntax for defining messages and services, field constraints, supported data types, usage of the protoc tool, and complete Go examples for both server and client implementations.
This article demonstrates a common mistake when parsing a date string without a year in Java, shows the resulting DateTimeParseException, and provides a correct solution using DateTimeFormatterBuilder to supply a default year, complete with code examples and expected output.
This tutorial demonstrates how to add Baidu's ECharts JavaScript visualization library to a Spring Boot backend, covering project setup, Maven dependencies, controller creation, Thymeleaf template configuration, and rendering a line chart in the browser.
This article examines the business drivers behind distributed task scheduling, outlines key requirements and pain points, and provides a comprehensive comparison of Java Timer, ScheduledExecutorService, Spring Task, Quartz, XXL‑JOB, Elastic‑Job, and other open‑source frameworks, helping you choose the most suitable solution for your system.
During the COVID‑19 outbreak, Amap’s engineers and partners created a free “Medical‑Staff Ride” service for Wuhan’s medical personnel, designing, coding, testing, and launching the app‑integrated ride‑hailing feature within three days and adding a reservation function the next day, thanks to prior platform upgrades, tight cross‑functional collaboration, and rapid decision‑making.
This article explains the purpose, benefits, core APIs, implementation classes, execution flow, state management, and monitoring methods of Java thread pools, providing detailed code examples and diagrams to help developers understand and effectively use thread pooling in high‑concurrency applications.
