This article explains common message‑middleware use cases such as asynchronous processing, system decoupling, and traffic‑shaping, compares the performance of popular brokers, and provides a step‑by‑step guide with code examples for integrating RabbitMQ into a Spring Boot application.
This article introduces an OA office automation system built with Spring Boot, MySQL, Freemarker, and Bootstrap, outlines its project structure, front‑end and back‑end components, provides step‑by‑step deployment instructions, and shares screenshots and the repository link for developers.
This article examines why many developers hit income plateaus at junior, senior, and architect levels, identifies the specific technical and mindset bottlenecks at each stage, and offers concrete strategies to overcome them and accelerate career and salary growth.
This guide introduces fifteen essential IntelliJ IDEA plugins—including CodeGlance, Codota, Material Theme UI, Alibaba Java Coding Guidelines, Alibaba Cloud Toolkit, GenerateAllSetter, Zookeeper manager, JRebel, JSON Parser, Lombok, JUnitGenerator, MyBatis Log Plugin, MyBatisCodeHelperPro, RESTful Toolkit, and Translation—each described with usage tips to boost Java developers' productivity.
This article explores practical approaches to building extensible business systems by addressing database scalability through sharding and partitioning, designing flexible application layers with configurable rules and hooks, and applying SOA principles to achieve modular, service‑oriented architectures that adapt to changing requirements.
This article presents a curated list of indispensable IntelliJ IDEA plugins for Java developers, detailing features such as code mini‑map, AI‑based code completion, UI themes, Alibaba coding guidelines, cloud deployment tools, automatic getter/setter generation, Zookeeper management, hot‑reload, JSON formatting, Lombok annotations, test generation, MyBatis enhancements, RESTful utilities, and translation assistance.
This article compiles and explains twenty frequent Java backend development mistakes—from classic NullPointer exceptions and incorrect date formatting to BigDecimal precision issues, improper use of ConcurrentHashMap, ThreadLocal data leakage, misuse of Arrays.asList, transaction pitfalls, and serialization quirks—providing code examples and best‑practice solutions to help developers write safer, more reliable code.
The article introduces mica-auto, a Spring Cloud component that uses annotation processing to automatically generate starter configurations, SPI entries, and Feign client setups, and provides usage examples for Maven and Gradle along with recent updates.
This article analyzes the challenges of evolving a supply‑chain procurement platform amid shifting market dynamics and pandemic disruptions, and presents a four‑step framework—macro definition, blueprint design, system implementation, and continuous evolution—to build a resilient, high‑availability backend architecture.
This article explores Spring Security’s ResolvableType class, demonstrating how its static factory methods—such as forClass, forClassWithGenerics, forField, and forMethodParameter—simplify obtaining generic type information via reflection, and shows practical code examples that replace cumbersome traditional Java reflection techniques.
The article details OkCupid’s year‑and‑a‑half migration from a REST API to a production GraphQL API, describing the four‑step process—page selection, schema construction, shadow requests, and A/B testing—along with lessons learned about error handling, business‑logic placement, and performance monitoring.
The article explains PHP’s rsort() function, which sorts an array in reverse order, details its parameters and return values, and provides a complete example showing how to sort a fruit list and output the sorted elements with their indices.
This article introduces Elasticsearch’s core concepts—including clusters, node roles, documents, mappings, and shards—and walks through the complete indexing workflow from client request to replica synchronization, highlighting key settings, routing calculations, and the role of refresh and flush operations.
This tutorial walks through creating a complete, database‑free food ordering system in Java, covering class design for dishes, users, orders, and administrators, implementing CRUD operations with in‑memory maps, and providing a console menu for both admin and customer interactions.
This article provides a concise, code‑driven walkthrough of Netty's core components—including event‑loop groups, channel initialization, pipeline handling, and the server‑client handshake process—by simplifying the original source to highlight the essential mechanisms behind asynchronous network communication in Java.
This article presents a curated collection of fifteen IntelliJ IDEA plugins that boost Java development productivity, ranging from code navigation and AI‑assisted completion to UI themes, coding standards, cloud deployment, automatic getter/setter generation, testing utilities, and handy JSON and translation tools.
This article explains socket fundamentals and walks through creating a simple UDP‑based chatroom in Python, covering basic socket creation, common methods, a straightforward server‑client example, and an enhanced multi‑user implementation with full source code and execution details.
This article explains how to control request frequency in Python using the ratelimiter library for synchronous and asynchronous code, and introduces SlowAPI as a flexible solution for FastAPI and Flask, helping backend developers reduce server load and protect APIs from abuse.
Zheng is a full‑stack J2EE enterprise solution that offers a complete suite of micro‑service modules—including content management, payment, user management, WeChat integration, storage, configuration, logging, and task scheduling—designed to help small‑to‑medium businesses build robust, scalable applications using Spring, MyBatis, Thymeleaf and related technologies.
This guide explains the concepts, implementation steps, configuration examples, and key differences between Servlet Filters and Spring MVC Interceptors, helping developers choose the right tool for request preprocessing, logging, and access control in Java web applications.
Vivo extends Dubbo with a custom NearestRouter that reads each provider’s app_loc label to preferentially route RPC calls to services in the same data‑center or city, falling back based on configurable thresholds, and plans to enhance routing with richer topology metadata, composite policies, and cloud‑native service‑mesh integration.
The article introduces the widely‑starred GitHub project “Node.js Best Practices,” highlighting its multilingual documentation, comprehensive coverage of project structure, error handling, coding standards, testing, production, security, and performance, and encourages readers to visit the repository for detailed guidance.
ebatis is an Elasticsearch ORM framework that simplifies query building by providing a MyBatis-like interface, eliminating the need for manual DSL construction and enabling seamless version upgrades.
This article explains the core concepts of high‑performance Linux network programming, covering IO events, IO multiplexing, thread and event‑driven architectures, the Reactor pattern and its variants, as well as synchronous versus asynchronous IO, providing clear examples and practical guidance for building efficient server frameworks.
This article explains three Redis-based approaches—using Hashes, Bitsets, and the HyperLogLog probabilistic algorithm—to count daily website visits, detailing command usage, advantages, disadvantages, and implementation considerations for high‑traffic sites, including handling logged‑in and anonymous users, memory consumption, and accuracy trade‑offs.
This article presents sixteen practical coding habits—from self‑testing and parameter validation to thread‑pool usage and cache consistency—that help developers avoid common bugs, improve reliability, and write cleaner, production‑ready code across backend systems.
This article explains how Spring Boot 2.4 changes the way multi‑environment configurations are defined and activated, replacing the old spring.profiles property with spring.config.activate.on-profile and showing how to specify and launch profiles both in YAML files and via command‑line arguments.
This guide explains the relationships and dependencies among Java logging frameworks such as Log4j, SLF4J, Logback, and JUL, shows how to resolve common issues like missing logs or jar conflicts, and provides practical steps to unify logging output across different modules and libraries.
This article explores how Spring Security processes OAuth2 login callbacks, detailing the role of AuthenticationManager, the creation of OAuth2LoginAuthenticationToken, the selection of appropriate AuthenticationProvider such as OAuth2LoginAuthenticationProvider and OidcAuthorizationCodeAuthenticationProvider, and the subsequent generation of OAuth2User and token objects.
This article examines Xianyu's two promotional features—Resale Lottery and Money Tree—detailing their gameplay, underlying business models, and the backend technical solutions such as event collection, idempotent reward accounting, concurrency control, fatigue management, and distributed locking.
This article introduces Ballerina’s unique language features, including native XML/JSON data types, datatable handling, inline definitions, parallel processing with workers and fork‑join, and the comprehensive development toolset such as Composer, Testerina, connectors, and editor plugins, illustrating code examples throughout.
This article lists the most popular Java utility classes and their frequently used methods, ranked by analysis of 50,000 open‑source projects, helping developers quickly discover ready‑made functionality and avoid reinventing common code.
Spring Boot 2.4.1, the final release of the year, focuses on fixing numerous configuration‑related bugs across the 2.4.x line, providing developers with a more stable upgrade path and addressing issues from property binding to Actuator endpoints.
This article reviews five widely used cache read/write strategies—including simple write‑DB‑then‑cache, Cache‑Aside, Write/Read‑Through, Write‑Back, and LRU eviction—explaining their workflows, advantages, disadvantages, and suitability for different production scenarios.
This article recounts how Tesla's CTO led a 25‑person team to develop the "Warp" ERP in just four months, initially using the Mendix low‑code platform before rewriting it in C# on .NET and deploying it to a private cloud, highlighting the technical decisions behind the project.
This article explains why effective error logging is crucial for debugging, analyzes common causes of errors across system layers, and provides concrete guidelines and code examples for writing complete, specific, and actionable error logs that simplify issue identification and resolution.
This article explains how to implement distributed locks using Redis, covering the essential requirements of mutual exclusion, deadlock avoidance, and fault tolerance, detailing single‑instance and multi‑instance algorithms, code examples with SETNX and Lua scripts, and discussing challenges such as latency, crashes, and persistence.
This tutorial walks you through installing YApi, configuring its environment, importing Swagger definitions, managing interfaces, leveraging mock data, enabling automatic sync, and handling permission management, providing a powerful, secure API documentation solution for backend developers.
This article provides a step‑by‑step guide on using Scrapy’s crawl template to automatically scrape product details such as ID, title, shop name, shop link, and price from JD.com, including source analysis, project setup, code snippets, and result verification.
The article argues that Spring MVC remains a mainstream Java web framework but explores how the rise of reactive programming and Spring WebFlux reshapes its relevance, highlighting the shift toward front‑back separation, @RestController usage, and the broader Reactive Revolution in web development.
This article presents a detailed case study of how an international hotel division identified low pre‑sale service smoothness, defined quantitative metrics, analyzed caching and real‑time quote‑fetching trade‑offs, and redesigned the quote‑fetching scheduling mechanism to raise overall flow smoothness toward an 87% target.
This article explores nine core design patterns implemented in Spring—simple factory, factory method, singleton, adapter, decorator, proxy, observer, strategy, and template method—detailing their implementation mechanisms, underlying principles, code examples, and practical significance for building loosely coupled, extensible Java applications.
This article shares Huawei Cloud’s practical experience of using Go to build cloud‑native microservices, covering the evolution of their Service Center, key design patterns such as static‑dynamic information separation, contract‑driven services, dependency management, caching, and the open‑source Go Chassis framework.
This article explains how N‑API provides an ABI‑stable, cross‑version add‑on API for Node.js, outlines recent multithreading, worker‑thread, and helper function enhancements, discusses build tooling options, and offers resources for getting started and contributing to the ecosystem.
This article explains the role of an order system in e‑commerce, outlines its relationships with other business modules, details its core architecture and workflow—including order creation, payment, inventory handling, and reverse processes—and discusses future development directions for unified order management.
This article introduces Kotlin’s growing role in backend development, explains its interoperability with Java, and walks through creating a Spring Boot microservice using Kotlin, including project setup with Spring Initializr, Maven configuration, and sample code for a simple web endpoint, illustrating the benefits of concise Kotlin syntax.
The article uses a casual conversation between two backend engineers to introduce multithreading concepts, explain shared vs. private resources, define thread‑safe and reentrant functions, illustrate common pitfalls with code examples, and provide practical guidelines for writing correct concurrent C++ services.
This article explains the fundamental differences between RPC and HTTP services, covering OSI layers, RPC architecture, synchronous and asynchronous calls, and popular RPC frameworks such as gRPC, Thrift, and Dubbo, while also comparing their suitability for large‑scale versus small‑scale applications.
Spring Boot 2.4.0 introduces major configuration handling changes that can cause loading failures for Spring Cloud Config users, and because no compatible Spring Cloud release exists yet, it is currently advised not to upgrade to this version.
This article introduces Kotlin for backend development, explains why Kotlin works well with Spring Boot, and provides a step‑by‑step tutorial—including Maven setup, essential dependencies, and sample Kotlin code—to create a simple Spring Boot web application.
This article explains Kafka’s internal index files—OffsetIndex and TimeIndex—including their file formats, how they store relative offsets and timestamps, the space‑saving optimizations, the processes for appending, truncating, and looking up entries, and best‑practice cautions for handling these indexes.
This article compiles sixteen classic Java coding habits—from self‑testing changes and validating method parameters to handling resources, avoiding runtime errors, and ensuring thread‑safety and cache consistency—providing practical guidance that helps prevent most non‑business bugs.
This article introduces Kotlin for backend development, explains its advantages over Java, and provides a hands‑on tutorial with Maven configuration, source code, and deployment steps to create a simple Spring Boot web service using Kotlin.
This article explains Kafka's index architecture, the AbstractIndex class hierarchy, how entry sizes are chosen, the use of memory‑mapped files, the binary‑search algorithm for locating index entries, and a cache‑friendly improvement that reduces page faults and I/O latency.
This article presents a complete, step‑by‑step Java console application that implements a rudimentary food‑delivery ordering system without a database, covering entity classes, a generic DAO interface, in‑memory management classes for admins, dishes, users and orders, a menu‑driven UI, and a test driver.
This article explains the purpose of API gateways in microservice architectures, outlines their key capabilities such as unified routing, security, logging and rate limiting, describes when they are needed, and reviews popular open‑source and cloud offerings like Kong, Alibaba Cloud, and Goku.
This article explains the fundamentals of queues and blocking queues, describes how Java's java.util.concurrent.BlockingQueue works, outlines its main methods and common implementations, and provides a complete custom BlockingQueue source code example for multithreaded producer‑consumer scenarios.
This article explains why RPC is essential for distributed services, defines its core concepts and architecture, compares it with REST, SOAP and SOA, outlines the components and call flow, and reviews key technologies and popular Java‑based RPC frameworks such as Dubbo, Thrift and Avro.
This article introduces the concept of RPC (Remote Procedure Call), explains its underlying principles—including client workflow, dynamic proxies, serialization, network transmission, and server handling—provides Java code examples for both client and server sides, and summarizes key takeaways for building or understanding RPC frameworks.
This article dissects Spring Boot's auto‑configuration mechanism by examining the source code of @SpringBootApplication, @EnableAutoConfiguration, @AutoConfigurationPackage, and the ImportSelector, explaining how starter packages, component scanning, and spring.factories drive the framework's zero‑configuration experience.
Docker confirms plans to support Apple Silicon Macs but faces several technical hurdles, requiring pipeline changes, reliance on Go and Electron, and coordination with other virtualization tools like VMware and Parallels to deliver a seamless Docker Desktop experience on M1 devices.
array_replace_recursive is a PHP function that recursively replaces elements of the first array with values from subsequent arrays, handling nested arrays and scalar values, and this article explains its behavior, parameters, return value, and provides a complete example with code and output.
The team migrated a large, multi‑service microservice publishing platform—including Xianyu, Taobao, Alipay, and Tmall—from a centralized environment to a department‑built infrastructure in ten working days by cloning the repo, updating configurations, separating databases, rigorously verifying functionality across dev, pre‑release, and production, and ensuring isolation and monitoring for stability.
This article provides a step‑by‑step technical analysis of Spring Boot's startup process, breaking down the creation of SpringApplication, the configuration of application type, initializers, listeners, and the eight phases executed by the run() method, complete with code snippets and diagrams.
Java 8’s Stream API builds a lazy pipeline where each intermediate operation is recorded as a stage and only a terminal operation triggers a single-pass execution, using internal classes like ReferencePipeline, Slink, and Sink to efficiently combine stateless, stateful, and short‑circuiting operations.
MyBatis-Plus (MP) is a non‑intrusive MyBatis enhancement tool that offers a rich set of CRUD features, multi‑database support, code generation, and plugins, and this article explains its key capabilities, architecture diagram, and provides a step‑by‑step quick‑start example with Maven dependencies and sample query code.
Spring Boot 2.4 introduces automatic removal of empty starter dependencies when building executable JARs, reducing size by eliminating unnecessary starter JARs; this guide demonstrates the effect, explains what empty starters are, and shows how to customize JARs for automatic slimming using manifest entries.
This article introduces the fundamentals of API gateways, explains why Haodf replaced Nginx with Kong, details Kong's architecture, plugins, traffic segmentation, rate‑limiting strategies, monitoring, and operational considerations for deploying Kong in a micro‑service environment.
The article explains why using COUNT(*) for existence checks is inefficient, proposes using SELECT 1 with LIMIT 1 in SQL and a null‑check in Java, provides code examples, and highlights the performance improvements of this optimization.
This guide shows how to import Swagger-generated API definitions into Postman, configure environment variables, handle authentication tokens, and use Postman for efficient API debugging, while noting the limitations of documentation display compared to Swagger.
Learn how Spring Boot 2.4 replaces the old CronSequenceGenerator with CronExpression, enabling advanced scheduling features such as built-in macros, last-day-of-month, weekday, and week-of-month semantics, with practical code examples and a reference table of common macros.
An in-depth case study shows how to refactor a Java e-commerce login module by adding IP-based and time-based security checks, identifying original code flaws, applying systematic extraction of utilities, simplifying nested loops, improving logging, and consolidating logic into a clean backend utility class.
This article presents a systematic performance comparison between Java and Go microservices—covering raw speed, memory usage, logging impact, GraalVM native images, and Kubernetes deployments—to reveal when each language excels and the practical trade‑offs involved.
When a RabbitMQ server accumulates thousands of pending messages, a newly started consumer can be flooded, causing performance degradation or crashes, so this guide explains how to use RabbitMQ's QoS settings and manual acknowledgments to throttle consumers and keep the system stable.
This article explains RabbitMQ exchanges, their key properties, and the four main exchange types—direct, topic, fanout, and headers—while providing step‑by‑step visual demos that show how messages are routed, filtered, or broadcasted in real scenarios.
This article provides a comprehensive overview of RabbitMQ, covering its origins, architecture, message routing patterns, persistence mechanisms, clustering, mirrored queues, flow control, and code examples for publishing and consuming messages, helping backend developers understand and effectively use the system.
array_multisort() is a PHP function that enables sorting of multiple arrays or multidimensional arrays simultaneously, supporting various sort orders and types, with detailed syntax, parameter explanations, and example code illustrating its usage and output.
This article explains how Spring MVC works by walking through a simple SSM project, showing the controller implementation, configuration files, deployment steps, and then detailing the ten-step request‑handling flow from DispatcherServlet to the final view rendering.
This article explains the difference between APIs and Java SPI, describes how SPI enables plug‑in development through ServiceLoader, and illustrates its practical use with JDBC driver loading and Flink table factories, providing code snippets and implementation steps for backend developers.
This article explains the purpose, tool selection, and implementation of an exception testing platform that uses ChaosBlade for fault injection and a SpringBoot wrapper to simplify backend integration and provide a front‑end UI for injecting various system anomalies.
This tutorial explains how to use PHP's GD library to create a canvas, draw basic shapes such as ellipses, lines, rectangles, arcs, and filled arcs, output images in common formats, add text with TrueType fonts, generate captchas, and properly release memory, providing complete example code.
This article examines common techniques for implementing a user check‑in function in web and mobile applications, comparing a straightforward MySQL table solution with a Redis bitmap approach, detailing the data structures, code examples, workflow, and the advantages and disadvantages of each method.
This article provides a comprehensive overview of Spring Cloud’s core components—including Eureka for service registration, Ribbon for client‑side load balancing, Feign for declarative REST calls, Hystrix for circuit breaking, and Zuul as an API gateway—explaining their mechanisms, configurations, and interactions within a microservice architecture.
This article analyzes the business flow of flash‑sale (seckill) systems, identifies ten technical challenges such as high concurrency, bandwidth, stock‑deduction and cheating, and presents architecture principles, design patterns, code examples, and safety mechanisms to build a reliable, scalable backend for flash‑sale scenarios.
This article explains the Command‑Query Separation principle and introduces three CQRS architectures—single‑database, dual‑database, and event‑sourced—detailing how separating reads and writes can improve performance while highlighting the added complexity each approach brings.
This article explains how MyBatis can instantiate a mapper interface without an implementation class by using a custom JDK dynamic proxy (referred to as "投鞭断流") that intercepts method calls, creates result objects, and demonstrates the full source code and execution output.
This guide explains the PHP function array_diff_ukey, shows how to provide a custom key‑comparison callback, details each parameter, and demonstrates with a complete code example that returns the intersecting keys of two associative arrays.
This article explains why Redis uses a custom SDS string structure instead of native C strings, describes the SDS layout, expansion rules, redisObject metadata, and the three string encodings (int, embstr, raw) that optimize performance and memory usage.
This article explores common data‑synchronization challenges such as double‑write consistency and atomicity issues across databases, Redis, Elasticsearch and Hadoop, and presents a generic solution using ordered message queues and change‑data‑capture middleware to ensure reliable, consistent updates.
The article describes how the Wukong Activity Platform’s data‑persistence layer uses Node.js as a BFF with MySQL, combines raw drivers, optional ORMs, and a custom lightweight Node‑MyBatis framework that offers dynamic SQL templating, built‑in injection protection, declarative transaction decorators, and automatic TypeScript type generation for full‑stack JavaScript development.
This tutorial explains how to obtain the WeChat Pay V3 platform certificate public key, decrypt the AES‑256‑GCM encrypted response, and implement a thread‑safe dynamic refresh mechanism in Java to ensure continuous verification of payment callbacks.
This article explains the fundamentals of traditional socket programming and compares it with Netty's architecture, covering server and client components, HTTP request handling steps, Netty's NioEventLoop, Channel, ByteBuf, Pipeline, and unsafe implementations, all illustrated with diagrams and code snippets.
This article explains how to install and configure JRebel for both local and remote hot deployment in Spring Boot projects, compares it with Spring DevTools, provides step‑by‑step setup instructions, and addresses multi‑module deployment pitfalls.
This tutorial explains Spring Boot's three core annotations—@Configuration, @ComponentScan, and @EnableAutoConfiguration—by showing how Java Config replaces XML, demonstrating bean creation, lifecycle management, component scanning, and auto‑configuration with practical code examples for a Spring application.
The article introduces Zheng, a full‑stack J2EE enterprise solution built on Spring, SpringMVC and Mybatis, detailing its modular microservice architecture, technology stack, module functions, environment setup, deployment tools, and provides links to the source repository and demo screenshots.
The October 2020 Spring Data Ockham (2020.0.0) release introduces a new version‑naming scheme, updates to Spring Data Neo4j, JDBC, R2DBC, Redis, adds RxJava 3 and De‑lombok support, and outlines compatibility notes for Spring Boot 2.4 and Neo4j users.
Spring Framework 5.3 GA, released on October 27, brings JDK 8+ support, new R2DBC capabilities, performance tweaks, enhanced MockMvc and WebFlux features, and is the recommended long‑term upgrade for both 5.x and 4.x users with maintenance through 2024.
This article explains Netty's thread model, covering the evolution from simple Thread usage to Executor‑based pools, the design of the EventLoop interface, task scheduling mechanisms, differences between Netty 3 and Netty 4, and how thread allocation and ThreadLocal affect performance and scalability.
This article provides a comprehensive overview of Kafka as a distributed messaging middleware, covering its core concepts, architecture, producer and consumer mechanics, common interview questions, configuration options, high‑availability guarantees, and performance optimizations for backend developers.
This article provides an in-depth overview of Nginx, covering its introduction, architecture, and various modules, including real IP and rewrite modules, with practical examples and configuration details.
