This article examines the various design patterns—such as Factory, Singleton, Builder, Adapter, Proxy, Composite, Decorator, Template, Strategy, and Iterator—employed within the MyBatis source code, explaining their structures, usage scenarios, and related components to illustrate how the framework achieves modularity and flexibility.
This article explains how to retrieve and handle various Spring Boot API parameters—including query, path, request body, header, and file uploads—covers parameter type handling such as dates and lists, demonstrates validation annotations, and provides complete code examples for each scenario.
The article reviews the 2023 surge of generative AI in software engineering and introduces Unit Mesh’s open‑source ecosystem—including the Unit Runtime serverless Kotlin backend, the fine‑tuning framework Unit Minions, the AI‑assisted IDE plugin AutoDev, the code‑evaluation tool UnitEval, and various Copilot‑style utilities—highlighting their design, capabilities, and future directions.
This guide walks through configuring a Spring Boot 2.4.12 project with Elasticsearch 7.8, creating index templates, implementing bulk write operations, and testing the setup with sample code and endpoints, enabling automatic index creation and efficient data ingestion.
This article introduces the Hutool Java utility library, outlines its core modules, shows how to integrate it via Maven, and provides practical code examples for HTTP requests, random code generation, pinyin conversion, timing, number handling, data masking, email sending, and Bloom filter usage.
Learn how to integrate Spring Boot WebFlux with R2DBC for reactive database operations, covering R2DBC basics, driver selection, configuration, entity and service implementation, controller endpoints, repository usage, optimistic locking, and practical code examples to build high-performance, non-blocking backend applications.
This article explains how Spring handles common circular dependencies between singleton Beans by employing a three‑level cache (singletonObjects, earlySingletonObjects, singletonFactories), detailing the prerequisites, cache structures, workflow, and key source code snippets that illustrate the underlying mechanism.
This tutorial walks through advanced Spring Cloud Function features—including handling HTTP request parameters, function mapping and filtering rules, functional bean definitions, visualization via Actuator, and package scanning—providing code examples and configuration tips for Spring Boot 2.7.15 projects.
The article explains the evolution of software architecture by describing monolithic, distributed, microservice, and serverless models, outlining their structures, advantages, disadvantages, and practical considerations for developers and teams.
An in‑depth overview of Go (Golang) covers its origins at Google, core language features, tooling, concurrency model, ideal use cases such as cloud‑native and backend services, as well as its limitations and future outlook.
The article explains PHP 8.0's end‑of‑life, presents usage statistics, highlights the risks of staying on older versions, and details the new features and improvements in PHP 8.3, urging developers to upgrade promptly for security, compatibility, and performance benefits.
This article explains the PHP str_replace() function, its syntax, parameter details, and provides multiple code examples demonstrating simple string replacement, array-based replacements, URL modification, and HTML tag transformation.
Microsoft reports over 2.5 million Java developers using VS Code and outlines a new roadmap, while this guide walks you through installing the JDK, adding the Java extension pack, and creating Java projects in VS Code with troubleshooting tips.
This article compares the consistency read mechanisms of the distributed key‑value stores Consul and etcd, detailing Consul’s three read modes and leader‑forwarding logic, and explaining etcd’s serialize and linearizable reads, including the internal notification and index‑checking processes.
This article provides a comprehensive guide to MyBatis dynamic SQL tags—including foreach, if, where, choose, trim, set, and selectKey—showing how to build flexible queries, handle collections, and avoid common pitfalls with clear code examples and best‑practice explanations.
This article describes a practical approach to achieve environment‑based data isolation in Java services by adding an env field to tables, using a MyBatis interceptor to rewrite SQL, and defining custom annotations with AOP to control the isolation logic, while sharing code snippets and lessons learned.
This article explains the PHP file_put_contents() function, covering its syntax, parameters, return values, and multiple usage examples such as writing strings, appending data, handling arrays, and using callbacks, while also offering tips for efficient file operations in backend development.
This guide explains Spring’s @Import annotation, covering three import strategies—direct class array, ImportSelector, and ImportBeanDefinitionRegistrar—through detailed code examples, usage scenarios, and important version notes, helping developers improve configuration management, code maintainability, and readability in backend Java applications.
The article explains how Cloudflare built the Rust‑based Pingora reverse proxy to overcome Nginx's architectural limits, achieve higher performance, better connection reuse, lower CPU/memory usage, and stronger safety, while supporting new features for its edge platform.
The article explains that Spring Boot 3.x drops support for Java 8, causing IntelliJ IDEA’s Spring Initializr to list only JDK 17 or higher, and shows how developers can still create Java 8 Spring Boot projects by switching the Initializr URL to Alibaba Cloud’s start service.
This article introduces the Hutool Java utility library, outlines its extensive modules such as SecureUtil, HtmlUtil, and CronUtil, provides practical code examples, and explains how it can streamline development, improve security, and simplify scheduled tasks for backend projects.
The article recaps a Scala & Java meetup where experts discussed Java virtual threads as a breakthrough for JDK concurrency, examined their advantages over traditional threads, addressed limitations, explored their impact on Scala and other JVM languages, and included audience Q&A and community announcements.
This article explains how Redis uses Linux epoll and a single‑threaded event loop to handle millions of connections efficiently, covering the creation of the epoll object, server initialization, event registration, the main processing loop, and the mechanisms for reading, writing, and managing pending tasks.
This article demonstrates how Spring Boot 3.2 fully supports Java 21, Project Loom virtual threads, and GraalVM native images, providing step‑by‑step instructions, configuration details, and runnable code examples that showcase building, running, and profiling a Spring Boot application with these modern technologies.
This article provides a comprehensive, step‑by‑step overview of MyBatis’s architecture—including its three‑layer design, configuration parsing, proxy generation, and SQL execution process—while highlighting key features such as SQL mapping, dynamic SQL, parameter and result mapping, transaction management, connection‑pool integration, and second‑level caching.
This article demonstrates how to implement unified user login permission checks, centralized exception handling, and consistent response formatting in Spring Boot using AOP, HandlerInterceptor, @ControllerAdvice, and ResponseBodyAdvice, providing step‑by‑step code examples and configuration details.
PHP 8.3 introduces a suite of enhancements—including readonly class cloning, the json_validate() function, expanded Randomizer methods, typed class constants, anonymous readonly classes, dynamic constant access, refined date/time exceptions, improved unserialize() error handling, trait static properties, stack‑overflow detection, invariant constant visibility, and numerous other updates—aimed at making web development more efficient, secure, and expressive.
This article introduces Hutool, a comprehensive Java utility library that consolidates common functions such as file handling, encryption, HTTP, and scheduling into easy-to-use modules, showcases key components like SecureUtil, HtmlUtil, and CronUtil with code examples, and highlights its benefits for reducing development effort.
This article recounts a developer's journey into the Apache Seata project, detailing motivations for open‑source contribution, preparation steps, key architectural concepts, practical code‑reading tips, and effective ways to engage with the community to grow backend expertise.
This article explains why Java 21 deprecates the Windows 32‑bit x86 port and dynamic agent loading, outlines the technical reasons, shows the required configuration flags and code examples, and discusses the security and maintenance implications of using deprecated APIs.
Learn the fundamentals of Project Reactor’s Mono and Flux, including creation, subscription, error handling, and common operators, with detailed code examples and visual diagrams, enabling you to effectively implement reactive, asynchronous streams in WebFlux-based Java backend applications.
This article demonstrates how Spring Boot 3.2 fully supports Java 21, Project Loom virtual threads, and GraalVM native images, guiding you through installation, configuration, sample code, and performance benefits of running a Spring application on virtual threads and native compilation.
This guide explains how to capture Douyin dynamic wallpaper video URLs with mitmproxy, extract MP4 links from the generated content.data file, deduplicate them, and download the videos using a Python script with requests and tqdm.
This article explains how to use Spring Boot's YAML configuration files to define and manage simple properties, collections, maps, nested objects, and complex data structures, providing code examples and a complete sample to help developers efficiently handle intricate configuration scenarios.
This article explains how Spring’s FactoryBean mechanism enables seamless integration with MyBatis by detailing the roles of BeanFactory, SqlSessionFactoryBean, MapperScannerConfigurer, and MapperFactoryBean, and provides annotated code examples and XML configuration to illustrate the underlying process and its benefits for transaction management and thread safety.
This article explains how PHP's built-in encryption functions such as md5, sha1, base64_encode/decode, and openssl_encrypt/decrypt can be used to secure data transmission, provides code examples demonstrating AES‑128‑CBC encryption and decryption, and highlights their role in protecting sensitive information.
Spring Boot 3.2, released shortly after Java 21, brings a host of enhancements such as virtual thread support, CRaC checkpoint restore, SSL bundle reloading, improved observability, new RestClient and JdbcClient, Jetty 12, Pulsar, Kafka and RabbitMQ SSL, redesigned nested JAR handling, Docker image build upgrades, and a comprehensive video walkthrough by Josh Long.
This article explains every Spring Boot startup event, from ApplicationStartingEvent to ApplicationFailedEvent, showing when each occurs, how to customize them, and providing clear code examples to help developers extend and debug their applications effectively.
This article details the challenges of RPC stability in a large‑scale microservice environment and explains the architectural redesign, SLO implementation, logging governance, exception dashboards, degradation, rate‑limiting, outlier removal, thread‑pool isolation, weak registry dependencies, and post‑incident knowledge‑base practices that together ensure reliable, high‑performance service communication.
The article explains why Java 21 deprecates the Windows 32‑bit x86 port and dynamic agent loading, describes the technical reasons, shows the new configuration options and related warnings, and discusses the impact on virtual threads and best practices for avoiding deprecated APIs.
This article explores how PHP and Python can be combined to build scalable, efficient, and user‑friendly mobile applications, highlighting PHP’s strengths in backend services, Python’s cross‑platform capabilities, and strategies for integrating both languages to maximize performance, scalability, and development speed.
Thread pools are essential for managing concurrent tasks efficiently, reducing resource overhead by reusing threads instead of creating new ones for each task, which is crucial for handling high-volume operations like exporting large datasets to Excel.
This tutorial explains what HTTP/2 is, lists required OpenSSL and Nginx versions, walks through compiling OpenSSL and OpenResty with the proper flags, shows how to replace Nginx binaries, configure HTTP/2 in nginx.conf, and verify the setup using Chrome’s net‑internals tool.
This tutorial walks you through adding MongoDB dependencies to a Spring Boot project, configuring the connection, defining entity and repository classes, implementing service and controller layers, and optionally setting up sharding or replica‑set architectures for scalable data management.
This article explains how PHP can connect to various databases, execute queries, fetch results, insert or update records, close connections, handle errors, and address security concerns, providing code examples for both MySQLi and PDO extensions.
This article explains how to use Spring Cloud Gateway 3.1.5 to create a lightweight API gateway by configuring routes in YAML and implementing routing logic directly in a Spring MVC or WebFlux controller with ProxyExchange, covering features, code examples, and dynamic path mapping.
This article explains the Chain of Responsibility design pattern, shows how to apply it to multi‑step product creation validation and expense‑approval workflows, walks through abstract and concrete handler implementations, dynamic configuration, and client execution with full Java code examples.
Redis Sorted Sets, powered by skip lists, provide O(log n) operations for ranking and range queries; this article explains their internal structure, core commands, and demonstrates how to implement a real‑time leaderboard in Spring Boot using Redis, complete with configuration, entity design, and service methods.
This article outlines the background, terminology, network architecture, and step‑by‑step Node.js implementation of both MQTT broker and client for a sensor project, enabling two‑way communication between cloud platforms and edge devices without fixed IPs, complete with code snippets and visual results.
This article explains how to design a clean, maintainable Spring MVC controller layer by unifying response structures, applying centralized exception handling, and leveraging JSR‑303 validation with custom rules, illustrated with comprehensive code examples and best‑practice guidelines.
This article explains the benefits of using short‑link services for marketing, sharing, and SMS optimization, and provides step‑by‑step Flask and Django tutorials—including installation commands, MySQL integration, URL generation, routing, and database models—to create a functional short URL platform.
This article explains how to handle enum and JSON string parameters in Spring MVC by creating custom annotations and argument resolvers, demonstrates the implementation steps with full code examples, and also reviews Spring MVC's built‑in parameter binding mechanisms such as @RequestParam, @PathVariable, @RequestBody, and @ModelAttribute.
This article explains the concept and inner workings of Spring Boot Starters, demonstrates how they simplify dependency management and auto‑configuration, and provides a step‑by‑step guide to creating and using a custom Starter with full code examples.
The article demonstrates how combining Domain‑Driven Design with architecture mapping can transform a complex video‑membership platform by modeling domains, refactoring monolithic components into a clean micro‑service architecture, and quantitatively evaluating the resulting reductions in code size, latency, cost, and improved modularity.
This article explains what SaaS is, outlines its business value, and walks through the full technical stack—from entry points and access layer to business, data, and operations layers—while comparing shared, dedicated, and hybrid deployment models and future challenges.
Spring Boot 3.2 introduces Java 21 virtual thread support, SSL hot‑reload for embedded servers, GraalVM native image improvements, and a preview of Spring AI, marking a major evolution for Java backend development and performance optimization.
This article explores PHP's core architecture for high scalability, covering modular design with namespaces and custom extensions, runtime dynamic loading via autoload and PSR standards, event‑driven structures, and caching optimizations such as opcode and data caches, illustrated with concrete code examples.
This article introduces Hutool, a comprehensive Java utility library that consolidates common functions such as file handling, encryption, date manipulation, and more, explains its key modules, shows how to add it via Maven, and provides practical code examples for utilities like DateUtil, StrUtil, NumberUtil, and SecureUtil.
This article reviews the major updates introduced in recent JDK releases, covering the shift from char[] to byte[] in String, expanded pattern‑matching in switch, removal of biased locking, G1 garbage‑collector evolution, JDK/JRE consolidation, generics specialization, and the addition of private methods in interfaces.
This article explains how to simplify Spring MVC interface calls by defining custom annotations, implementing a custom HandlerMapping, configuring it in Spring Boot 2.6.12, and demonstrating usage with example code, while also covering related handler adapters and underlying principles.
This article explains why developers should replace class‑constant patterns with PHP enums, highlighting four benefits: the built‑in cases method, type hinting, enum‑specific methods, and the uniqueness of enum types that improve code safety and readability.
This article introduces a generic asynchronous processing SDK for Java back‑ends, explaining its purpose, advantages, underlying principles, components, design patterns, database schema, configuration, usage, and operational considerations, and provides complete code and configuration examples.
This article explains why Elasticsearch is fast, outlines its key features, and provides a complete Spring Boot 2.4 tutorial—including dependencies, configuration, data model, repository usage, and test code—for building a distributed search service.
The author celebrates Programmer's Day by sharing a comprehensive 100,000‑word e‑book on RocketMQ design, detailing personal learning experiences, practical applications, and key concepts to help backend engineers quickly master this powerful message‑queue technology.
The article details how a Go service’s default GOGC setting caused overly frequent garbage‑collection pauses that spiked request timeouts, and how adjusting GOGC dynamically with debug.SetGCPercent and setting memory limits reduced GC CPU usage, extended pause intervals, and eliminated timeout spikes.
This article details the evolution of Ctrip's flight IVR system from a simple Chinese‑only version to a multilingual, fully visualized low‑code platform, describing its architecture, core components such as data definition, rule and script engines, version management, and the underlying Node.js and React technologies.
PHP 8.3, released on November 23, 2023, introduces typed class constants, a high‑performance json_validate function for JSON payload validation, and numerous minor enhancements such as Randomizer tweaks, read‑only property cloning, the #[Override] attribute, and support for anonymous read‑only classes.
This guide explains how Java applications can send SMS messages efficiently by comparing client‑side SDK integration with a dedicated server‑side SMS platform, covering provider choices, code examples, multi‑channel aggregation with SMS4J, and design considerations for high‑availability messaging.
This article explains various PHP caching techniques—including file‑system, memory (Memcache and Redis), and framework (Laravel) caches—providing code examples and configuration steps to reduce database load, speed up page rendering, and enhance overall user experience.
This article examines the benefits and drawbacks of implementing caching in PHP backend development, illustrating how caching can boost page load speed, reduce database load, and improve performance, while also discussing cache expiration, data consistency, and memory usage, accompanied by practical code examples.
This article presents a curated list of essential Java libraries—including JUnit, Mockito, Jackson, Gson, SLF4J, Log4j2, Apache Commons, Guava, JAXB, Xerces, Apache POI, JavaAssist, Cglib, Eclipse Collections, Trove, Jsoup, Apache MINA, Netty, Lombok, and Testcontainers—explaining their purposes and why senior developers should master them.
This guide explains Spring Validation in Spring Boot 2.6, covering its lightweight features, configuration of Bean Validation providers, injection of validators, practical examples, custom annotation creation, method‑level validation, and additional configuration options with clear code samples.
This article provides a comprehensive, step‑by‑step analysis of MyBatis’s overall architecture, covering its core features, three‑layer design, configuration parsing, proxy generation, SQL execution process, and the underlying components that enable seamless Java‑to‑SQL mapping.
This article explains how to integrate Lua scripts into Spring Boot projects for Redis, covering Lua fundamentals, performance benefits, practical use cases, step‑by‑step implementation with code examples, error handling, security considerations, and best‑practice recommendations for backend developers.
This article explains PHP Traits, covering their concept, definition, usage examples, advantages such as avoiding multiple inheritance and reducing code duplication, as well as important considerations like method conflicts and precedence, providing a comprehensive guide for backend developers.
This guide explains how Spring Cloud abstracts multiple circuit‑breaker implementations, shows synchronous and reactive usage with code examples, and demonstrates custom configuration of Resilience4J circuit breakers for Java backend applications.
Learn how to implement both simple parameter checks and complex business rule validations in SpringBoot by leveraging Bean Validation, creating custom annotations like @UniqueUser and @NotConflictUser, and integrating them seamlessly into controllers to ensure data integrity and reduce boilerplate logic.
This guide walks through creating custom Spring MVC core components—including DispatcherServlet, HandlerMapping, HandlerAdapter, and ViewResolver—using annotations and Java code to gain full control over request handling, parameter resolution, and response rendering in backend development.
This tutorial introduces PHP's most commonly used string functions, categorizes them by purpose, and provides clear example code demonstrating how to retrieve string information, process, and convert strings, helping developers improve efficiency and code quality.
This guide presents a curated list of essential Java libraries—including testing, JSON, logging, utility, XML, Excel, bytecode, collections, HTML parsing, encryption, embedded databases, serialization, networking, Lombok, and Testcontainers—that can dramatically improve productivity and code quality for backend development.
After inheriting a decade‑old query optimizer with massive code duplication and performance issues, our team reduced the codebase by 80%, improved stability, cut startup time from 18 minutes to seconds, and enabled cloud deployment, sharing the code smells we encountered, their motivations, and concrete fixes.
This article explains PHP namespaces, shows how to define functions within them, demonstrates fully qualified and alias‑based calls, covers sub‑namespace and global namespace usage, and introduces the spl_autoload_register() autoloader with practical code examples.
This article explains PHP's reflection functions, showing how to create ReflectionFunction objects, retrieve function names, parameters, type hints, and dynamically invoke functions, with detailed code examples and practical guidance for backend developers.
This article explains PHP exception handling, covering the try‑catch syntax, built‑in and custom exception classes, useful handling functions such as set_exception_handler, throw and finally, and provides best‑practice guidelines for writing robust backend code.
This guide explains why and how to encrypt sensitive information in Spring Boot configuration files using Spring Cloud's built‑in encryption, Jasypt, command‑line parameters, and demonstrates the underlying implementation classes for secure application deployment.
This article explains PHP closure functions, covering their definition, syntax, typical use cases such as event handling, asynchronous programming and functional programming, provides code examples, discusses advantages, cautions, and demonstrates how closures improve code clarity and flexibility.
This article explains why exception handling is crucial in PHP development, demonstrates traditional error checks versus try‑catch usage, and provides practical steps for identifying, implementing, and managing exceptions to create more robust, maintainable, and user‑friendly applications.
This article explains SpringBoot’s auto‑configuration mechanism, walks through the DispatcherServlet example, and demonstrates how to build a custom logging starter—including annotation, properties class, AOP aspect, auto‑configuration class, Maven packaging, and usage—showcasing the efficiency and reusability benefits for backend developers.
This article introduces the most frequently used PHP sorting functions—including sort, rsort, asort, ksort, and uasort—explaining their behavior, usage examples, and output to help developers choose the appropriate function for arrays and associative arrays.
This article explains PHP 7 generators, describing their concept, memory‑saving benefits, and how to implement them with a practical example that reads a large file and yields squared numbers, demonstrating efficient data processing and lazy loading in backend development.
To improve testing efficiency in payment settlement, the article proposes a design that aggregates all database modifications across multiple databases and tables into a single view by instrumenting JDBC calls via JVM‑sandbox, handling SQL capture, transaction awareness, and front‑end visualization.
This article explores four powerful yet understated caching techniques—HashMap with read‑write locks, LinkedHashMap‑based LRU caches, TreeMap for consistent hashing, and ByteBuffer pooling—detailing their implementations in middleware such as RocketMQ, MyBatis, and Cobar to enhance backend performance.
This article shares a Java developer’s six‑year experience with Arthas, detailing how vmtool, hot‑swap, OGNL filtering and various Arthas commands can dramatically improve problem‑diagnosis, reduce log noise, and accelerate debugging in production environments.
This article introduces Xshell and Xftp, explains their features for server access and file transfer, and provides a step‑by‑step guide for downloading, installing, activating, and verifying the tools on Windows, aimed at backend developers needing reliable connection utilities.
This article walks through a real‑world R2M (Redis‑like) cache alert, detailing the email notification, large‑key analysis, code inspection, root‑cause identification, and both immediate and long‑term solutions that reduced cache usage by over 97% and prevented future incidents.
This article explains PHP 7's enhanced anonymous functions and closures, demonstrating their syntax, usage as callbacks, and how they can simplify array processing through functions like array_map and array_reduce, ultimately improving code readability, maintainability, and flexibility.
This article explains the fundamentals of Memcache in PHP, covering its purpose as an in‑memory cache, how to connect, store, retrieve, delete, increment, decrement, and flush data, along with important considerations such as data types, memory limits, server failures, and multi‑server sharing.
This article details a step‑by‑step performance tuning of the Helios scoring API, showing how profiling with Arthas revealed costly date formatting and list operations, and how successive code refactors—changing data structures, eliminating redundant object creation, and optimizing loops—cut the response time from several seconds to just a few dozen milliseconds.
This article explains how the Chain of Responsibility design pattern is implemented within Spring MVC interceptors, detailing the request flow, interceptor lifecycle methods, and practical differences from the classic GoF definition, while also exploring other typical use cases of the pattern.
This article explains Java threads and thread pools, covering basic concepts, creation methods, execution differences, multithreading benefits, detailed analysis of ThreadPoolExecutor internals, and practical usage examples with code snippets.
