During a weekend on‑call shift a Java monitoring service repeatedly timed out due to network packet loss and a severe memory leak, leading to massive CPU usage and full GC cycles, which were diagnosed with jstat, jstack, heap dumps and MAT before the leak was eliminated.
This article explains why developers should avoid overriding the HttpServlet service() method, illustrating how the default implementation handles HTTP cache negotiation, showing concrete servlet examples, and demonstrating the significant traffic and performance benefits of letting the container manage caching automatically.
This article explains why traditional in‑process locks fail under massive concurrency, how distributed locks using Redis or Zookeeper ensure atomic updates across many servers, and details practical implementations, pitfalls like deadlocks, and strategies such as key expiration and ephemeral sequential nodes.
This article explains how Mafengwo transformed its search service by replacing serial function calls with a Golang‑based concurrent proxy, reducing average latency from 400‑500 ms to around 240 ms while improving scalability, fault tolerance, and resource utilization.
This article explains what Spring Boot and Spring Cloud are, why they are used, their configuration file types, hot‑deployment methods with code examples, the differences between JPA and Hibernate, and the main components of Spring Cloud such as Eureka, Ribbon, Hystrix, Zuul and Config.
This article explains how to create Java scheduled tasks using Spring's built‑in task scheduler, covering XML configuration, annotation‑based setup, dynamic code addition, and detailed usage of cron expressions for precise timing control.
This tutorial shows how to install pyftpdlib, write a nine‑line Python script to create an FTP server, customize user credentials and permissions, and access the server via a browser, while also discussing common IP address pitfalls.
This tutorial walks you through creating a complete Django project, covering settings configuration for templates, static files, and middleware, MySQL database integration, model definitions for publishers, books, and authors, view functions for CRUD operations, and essential front‑end template snippets, all with ready‑to‑run code examples.
This article explains how Node.js supports ES modules since version 8.5, compares CommonJS and ES module loading behaviors, demonstrates interoperability techniques with code examples, and outlines the practical implications of using the experimental‑modules flag for backend development.
This article explains Scala's powerful pattern matching mechanism, demonstrates matching on integers, strings, and types with code examples, compares it to Java's switch, and introduces case classes as special classes optimized for pattern matching, highlighting their automatically generated methods and usage.
This article explains the origin of Java thread pools, outlines their advantages and potential risks such as deadlocks and resource exhaustion, describes their internal states and processing flow, provides guidance on sizing for CPU‑ or I/O‑bound tasks, and reviews the four common thread‑pool implementations.
This article explains the distinct concepts of distributed systems, high concurrency, and multithreading, clarifies their relationships, describes horizontal scaling and vertical splitting, and outlines how these techniques are applied in Java backend development while also promoting a free Java interview series.
The author shares a personal journey from multiple Alibaba interview rejections to mastering backend engineering through diligent source‑code study, open‑source contributions, algorithm training, and practical project experience, offering actionable advice for aspiring developers seeking growth and interview success.
This article details the adoption of NodeJS and the Egg framework for front‑end/back‑end separation, covering SSR considerations, directory planning, scheduled tasks, error handling, service design, custom logging, Elasticsearch integration, and Docker deployment, offering practical insights and best‑practice recommendations for backend development.
This article explains Redis's memory model—including memory statistics, allocation, internal data structures like redisObject and SDS, object type encodings, and practical techniques for estimating usage, reducing fragmentation, and optimizing memory consumption—providing developers with actionable insights for high‑performance backend systems.
This guide explains how to create clear, hierarchical service names for microservices, defines environment partitions, shows how to use the Mica launcher with Spring Boot, and demonstrates custom configuration, plugin extension, and code examples for streamlined backend development.
This article explains how Spring implements declarative transaction management using proxies, compares JDK dynamic proxies and CGLIB, demonstrates their behavior with code examples, and clarifies which method modifiers support transactional annotations in Spring applications.
This article introduces Spring Boot, explains its advantages over traditional Spring projects, describes JavaConfig, shows how to use DevTools for automatic reloads, outlines Actuator monitoring, and provides practical guidance on security, YAML configuration, ActiveMQ integration, and pagination with Spring Data JPA.
This article walks through the evolution of Redis clustering—from early Replication+Sentinel setups, through Proxy‑based solutions, to modern Redis Cluster—detailing their architectures, advantages, drawbacks, and provides practical interview tips and high‑impact answers for candidates.
This article outlines a comprehensive Java interview study plan, covering JVM fundamentals, sorting algorithms and collections, multithreading, key storage technologies like Redis, MySQL, and Elasticsearch, Spring framework deep dive, Dubbo-based distributed architecture, and essential design patterns to master for backend development roles.
Microservices are isolated, loosely‑coupled units that solve single concerns, offering teams independent tooling, rapid iteration, and easier scaling; this article explains their principles, design considerations, challenges such as data sharing and dependencies, and provides a practical Node.js example with deployment tips.
This article first wishes readers a happy Lantern Festival and then provides a comprehensive step‑by‑step troubleshooting guide for installing and configuring the HttpRunnerManager environment, covering Python, Django, RabbitMQ, MySQL, character‑set settings, remote access, and required Python packages.
This article explores nine commonly used Spring design patterns—including Simple Factory, Factory Method, Singleton, Adapter, Wrapper, Proxy, Observer, Strategy, and Template Method—explaining their concepts, showing XML or Java code examples, and illustrating how Spring implements each pattern in real applications.
This article explains why the default single‑node Nacos setup is unsuitable for production, walks through configuring MySQL as a centralized data store, provides step‑by‑step configuration examples, and discusses the trade‑offs of using centralized storage versus distributed algorithms.
This article introduces the Java JUC concurrent collection classes, detailing the thread‑safe List and Set implementations, the concurrent Map variants, and the various Queue types, while providing diagrams and brief explanations of their usage and characteristics.
This tutorial explains how to integrate the ShedLock library with Spring, covering Maven dependencies, JDBC table setup, required annotations, and example code for creating synchronized scheduled jobs that run on only one instance at a time.
This article explains the purpose and proper use of abstract classes in Java, illustrates common misuse such as the Swiss‑Army‑Knife controller anti‑pattern, and demonstrates how the Template Method pattern can provide a cleaner design with concrete examples and code snippets.
This article explains the core concepts of Java Servlets, including their UML relationships, execution flow within a container, dual role as page and controller, and the complete lifecycle from loading to destruction, providing essential knowledge for backend development.
This article explains how Spring implements nine classic design patterns—including Simple Factory, Factory Method, Singleton, Adapter, Decorator, Proxy, Observer, Strategy, and Template Method—through configuration examples and Java code, illustrating their roles in building flexible, maintainable backend applications.
This guide outlines the four progressive stages of Java database development—basic JDBC usage, framework integration, performance tuning, and high‑availability architecture—providing practical techniques, tools, and best practices for building robust backend data systems.
This article introduces the Scrapy framework, explains its architecture and five core components, guides you through creating a Scrapy project, configuring spiders, pipelines, and middlewares, and demonstrates how to run the crawler to efficiently collect and process web data using Python.
This article introduces the REST architectural style, explains its advantages over traditional web approaches, and walks through a practical workflow that collects images, encodes them in base64, repeatedly calls a REST endpoint for face‑recognition results, and analyzes the returned JSON to evaluate algorithm performance.
This article dissects how a simple Spring Boot Hello World application launches, walks through the runtime call stacks, explains the FatJar packaging and custom ClassLoader, and reveals how @RestController classes are automatically registered with the embedded Tomcat server.
This article explains the origins and problems GraphQL solves, describes its core concepts and advantages, and provides step‑by‑step instructions for integrating GraphQL into a Vue front‑end with Apollo as well as setting up a simple Node.js GraphQL server, complete with code examples.
This article introduces Spring Cloud as a Spring Boot‑based microservice framework, explains the fundamentals of service architecture through a relatable story, details essential components such as service registry, load‑balanced calls, circuit breakers, gateways, configuration management, and provides concrete Java code examples for each part.
This article explains Java's three main concurrent queue implementations, advises using ConcurrentLinkedQueue for high-throughput request preprocessing, discusses proper design of flash-sale APIs, examines data-safety challenges such as overselling, and compares pessimistic, FIFO, and optimistic lock strategies to ensure correctness under extreme load.
This article explains Java string concatenation methods—including the + operator, concat, StringBuilder, StringBuffer, and StringUtils.join—covers their underlying implementations, compares their performance, and provides practical recommendations for efficient and thread‑safe usage.
This article lists and briefly describes the eleven most popular Java‑related GitHub repositories in December, covering learning guides, e‑commerce platforms, advanced Java topics, performance monitoring, high‑concurrency demos, diagnostic tools, Spring Boot, tutorials, messaging middleware, community software, and the Dubbo RPC framework.
This article shares a step‑by‑step experience of redesigning a project’s API by adopting front‑back separation, establishing unified interface conventions, standardizing database IDs, request/response formats, and implementing RESTful methods with Java Spring controllers, while also addressing tooling, documentation, and static resource strategies to dramatically reduce communication overhead and accelerate delivery.
This article provides a comprehensive overview of RocketMQ, covering its origins and evolution, core architecture components, message domain model, essential features such as ordered delivery and deduplication, and typical use cases like traffic shaping, asynchronous decoupling, and distributed transaction messaging.
The article explains how the Server‑Timing HTTP header can be used to transmit arbitrary server‑side metrics to the client, shows how to send multiple timing values, demonstrates Chrome DevTools support, warns about exposing sensitive data, and introduces a small hapi plugin that simplifies adding the header.
This tutorial shows how to quickly set up a functional FTP server using just nine lines of Python code with the pyftpdlib library, covering installation, core script, execution, and troubleshooting common IP address issues.
This article provides a comprehensive analysis of Spring AOP, covering its core classes, multiple proxy mechanisms, annotation‑based configuration in Spring Boot, the differences between Spring Boot 1.x and 2.x AOP settings, and detailed source‑code snippets that illustrate how advisors, pointcuts, and advices are created and applied.
This curated list compiles essential Spring Cloud Stream articles covering quick start, core concepts, consumer groups and partitions, common FAQs, and four detailed failure‑handling strategies, providing developers with a handy reference to master message‑driven microservices.
This article chronicles the evolution of the Spring ecosystem—from its origins as a lightweight dependency‑injection framework, through rapid version growth and corporate changes, to the emergence of Spring Boot and Spring IO, highlighting key releases, architectural shifts, and the impact on Java backend development.
The article uses a simple bank workflow with ten employees to illustrate how BIO, NIO, and asynchronous processing differ in task allocation and throughput, showing that dividing work among specialized roles dramatically increases the number of customers served per hour.
This guide walks through a step‑by‑step investigation of a sudden 98% CPU spike on a data‑platform server, showing how to pinpoint the offending process, trace the problematic Java thread, analyze the root cause in a time‑utility method, and apply an optimized solution that reduces CPU load by thirtyfold.
This tutorial explains how to collect data with a Python web crawler, store it in MySQL using PyMySQL, set up a Django project with Django REST framework, define models, serializers, and views, and implement pagination for a robust backend API.
In high‑concurrency scenarios, using Redis as a buffer can improve performance, but without proper strategies such as delayed double‑delete, cache expiration, or asynchronous binlog‑driven updates, inconsistencies between Redis and MySQL may arise, so this article explains the causes and presents four practical solutions.
This guide shares a personal interview journey, essential preparation resources, key Java and backend topics, effective self‑introduction tactics, resume and scheduling advice, common interview questions, and the post‑offer process to help engineers secure offers from top tech companies.
The article argues that true developer competence lies in deep architectural and design skills—covering physical storage, caching, data structures, and modular software design—rather than constantly chasing the latest languages or frameworks across backend, frontend, and mobile development.
The article argues that while reviewing interview experiences can help, it shouldn't be the main study method; instead, it outlines a comprehensive plan to rebuild Java backend fundamentals—from core language concepts and concurrency to networking, databases, and distributed systems—ensuring deeper understanding and better interview performance.
This tutorial walks through the design and implementation of a distributed configuration center using Spring Boot, demonstrating how to define configuration entities, apply the observer pattern for dynamic updates, and integrate a thread‑pooled scheduler to keep configuration in sync without restarting services.
This article provides a detailed overview of an API gateway solution, covering its background, advantages, core functions, comparison with open-source alternatives, typical usage scenarios, business and technical architectures, feature list, configuration interface, performance testing results, and future development plans.
This article explains the purpose of the Service layer in a Java SSM‑based high‑concurrency seckill project, walks through interface design, DTO/VO/PO concepts, provides full Service implementation with transaction management, custom exceptions, enumeration for status codes, Spring XML configuration, and unit testing examples.
Using Python's BeautifulSoup library, this guide walks you through building a web scraper that extracts real‑time weather details—including region, AQI, primary pollutant, and PM2.5 concentration—from the Green Breath website, handling missing data and providing console output for any Chinese city.
This article describes how a SpringMVC‑Dubbo micro‑service payment system was stress‑tested, diagnosed for thread‑creation and connection‑pool issues, and tuned through JVM, Log4j, and Dubbo configuration changes to raise throughput from 1 req/s to over 2600 req/s.
The article discusses the pain points of front‑back end separation such as frequent API changes, outdated documentation, and late testing, and presents a solution based on contract‑driven development with raml-mocker, a Node.js tool that generates mock servers and API documentation to improve collaboration and testing efficiency.
This article chronicles Dubbo’s journey from its 2018 Apache incubation vote through its key features, release history, and upcoming 2.7 version that aims to graduate the high‑performance Java RPC framework to an Apache top‑level project.
This article shares a free, two‑stage Java backend learning roadmap—beginner and intermediate—along with recommended resources, cloud‑storage links, and tips for continuous skill growth, helping developers overcome stagnation and stay competitive.
This article explains how Spring Boot, Spring, and Spring MVC relate to each other, describes Spring MVC's core concepts, and details Spring Boot's auto‑configuration, static resource handling, error handling, CORS support, and related code examples for building Java backend applications.
This article provides a comprehensive, step‑by‑step tutorial on designing and implementing a Java‑based inventory management system, covering requirement analysis, architecture, module design, development environment setup, and deployment using Spring, Spring MVC, Hibernate, ExtJS, Maven, and Tomcat.
This guide introduces Scrapy, a fast Python web‑crawling framework, explains its architecture, installation, project setup, spider creation, execution, and advanced features like XPath selectors, recursion, and item pipelines, providing a complete hands‑on tutorial.
This article compiles common interview questions and concise answers about Spring, Spring MVC, and MyBatis, covering core concepts such as IoC, AOP, transaction management, controller behavior, annotation usage, design patterns, MyBatis configuration, mapping techniques, pagination, and integration with Ajax.
This article presents a comprehensive overview of constructing a search engine using Elasticsearch, covering architecture components, data read/write mechanisms, shard management, caching strategies, and real‑world case studies that illustrate performance tuning, isolation, and deployment best practices.
This article introduces the rise of microservices, explains what Spring Cloud is, compares Spring Cloud Alibaba with Spring Cloud Netflix, and lists the open‑source and commercial components currently supported by Spring Cloud Alibaba, highlighting its suitability for high‑traffic Java backend applications.
This article introduces Apache RocketMQ by covering its origin, core concepts such as topics, producers and consumers, storage architecture with CommitLog and ConsumeQueue, deployment components like brokers and name servers, and practical best‑practice guidance for handling duplicates, ordering, and message replay.
This article explains the architectural challenges of large‑scale e‑commerce platforms during massive promotional events and provides a detailed, layer‑by‑layer guide to designing a highly available, horizontally scalable, stateless micro‑service backend with robust data handling, caching, messaging, and traffic‑management strategies.
This article explains the MVC pattern and provides a detailed introduction to Spring MVC, covering its core DispatcherServlet, required web.xml configuration, request processing flow, key components such as HandlerMapping, HandlerAdapter, ViewResolver, and includes code examples and component descriptions for backend developers.
This article provides a comprehensive overview of the Spring framework, detailing its lightweight nature, modular architecture, core features such as AOP, dependency injection, transaction management, integration capabilities, and the major enhancements introduced in Spring 5.0, including Java 8/9 support, reactive programming, and testing improvements.
The article traces the origins of the Zend Engine, its role as PHP’s core, the corporate shifts after its acquisition by Rogue Wave, and the recent departure of its key developers, highlighting community concerns and hopes for future contributions to PHP 8.
The article discusses the design of a job scheduling system emphasizing high availability over high concurrency, utilizing CronExpression parsing for task triggers and implementing flexible configurations to meet diverse business needs.
The article describes how to build a Go‑based backend for a WeChat lottery mini‑program using the Echo framework, Tencent Cloud load balancer, Nginx, Redis and MySQL, detailing the system architecture, API design, database and Redis integration, WeChat login flow, activity state machine, and lessons learned.
This article provides a comprehensive analysis of Java's ThreadPoolExecutor source code, covering class relationships, core interfaces, abstract implementations, internal fields, constructors, the Worker class, and detailed walkthroughs of key methods such as execute, addWorker, runWorker, getTask, processWorkerExit, tryTerminate, and idle thread interruption, plus monitoring techniques.
This article explains how to use Aspect‑Oriented Programming (AOP) in Java backend controllers by defining a unified ResultBean response format, outlining controller coding conventions, and providing complete Java and XML examples for logging, exception handling, and AOP configuration.
This article walks through the Spring MVC internals, explaining how the @ResponseBody annotation triggers JSON serialization by tracing the DispatcherServlet, HandlerAdapters, and ReturnValueHandlers, and includes runnable Spring Boot test code to illustrate the processing flow.
The article chronicles Elastic’s journey from a small open‑source search tool to a NYSE‑listed company, explaining Elasticsearch’s technical foundations, its real‑world applications, and what the IPO means for developers and the broader search‑technology ecosystem.
The article reviews three high‑star Java interview projects on GitHub—interviews, Java‑Interview, and JavaGuide—detailing their coverage of coding practice, data structures, algorithms, and system design, along with star/fork statistics and direct repository links to help developers prepare for technical interviews.
This article provides a comprehensive overview of Nginx, covering its high‑performance features, modular architecture, proxy capabilities, event‑driven model, multi‑process and asynchronous processing mechanisms, and how these components work together to deliver scalable web services.
This article provides a step‑by‑step guide to creating a Spring Boot application, generating a project template, adding a MyBatis‑based persistence layer, implementing service and controller layers, configuring the database, and running the application to expose REST endpoints.
The author shares a candid account of transitioning from an electronics engineering undergraduate to a Java backend developer, detailing study strategies, internship experiences, interview preparations, and lessons learned during multiple campus recruitment cycles at top tech companies.
This article explains how to use feature toggles in .NET Core to hide or gradually release functionality, covering built‑in toggle types, open‑source libraries, configuration via appsettings, custom toggle creation, and step‑by‑step code examples for practical implementation.
The article explains how Node.js now supports native V8 code‑coverage via the NODE_V8_COVERAGE environment variable, describes the limitations of traditional tools like Istanbul, outlines the benefits and challenges of using V8’s built‑in coverage, and provides practical steps and tools (c8, v8-to-istanbul) to generate readable coverage reports.
This article explains how to build a lightweight Tomcat-inspired web server called MyTomcat, covering its socket service, request dispatching, HTTP request/response encapsulation, servlet mapping, and demonstrates the complete project structure with illustrative diagrams and code snippets.
This article explains what RPC is, compares it with SOA, SOAP, and REST, outlines the step‑by‑step RPC execution process, and introduces several mainstream RPC frameworks such as RMI, Hessian, protobuf‑rpc‑pro, Thrift, Avro, and Dubbo.
The article examines the common pain points of mini‑program backend development—knowledge overload, high cost, and integration complexity—then explains how serverless architecture and Tencent Cloud's cloud development platform address these issues, offering faster, cheaper, and more scalable solutions with practical implementation guidance.
This article presents a comprehensive Git branching model designed for large-scale dual‑mode development, details naming conventions, granularity rules, code picking methods, shallow clone and sparse checkout techniques, and demonstrates its successful application in the Agricultural Bank's C3 credit management system while also announcing a related DevOps live event.
This tutorial walks you through the background, learning goals, and detailed Spring-based code examples of the Strategy pattern, including list and map implementations, configuration files, and a complete run‑time demonstration for Java developers.
The iQIYI video backend team outlines their microservice journey, detailing service decomposition strategies, choosing Spring Cloud for its low migration cost and rich ecosystem, and building a shared platform of registries, configuration, gateways, monitoring, and CI/CD to boost efficiency, reliability, and scalability while planning future adoption of service mesh and domain‑driven design.
This article explains the fundamental principles of web caching, how Nginx leverages the locality of reference to store local copies of responses, the 404‑error and resource‑missing driven caching mechanisms, and the proxy‑store and memcached based approaches, highlighting their benefits and limitations.
This article provides a comprehensive, question‑driven guide to Spring Boot, covering its differences from Spring and Spring MVC, auto‑configuration, starter projects, embedded servers, Maven plugins, DevTools, static resources, Spring Data, REST support, request mapping nuances, and profile‑based configuration for building production‑ready Java backend applications.
This article explains how Spring MVC uses @RequestBody to deserialize JSON request bodies into Java objects and @ResponseBody to serialize Java objects back to JSON, providing clear code examples, curl testing, and notes on @RestController behavior.
This article presents a comprehensive overview of Alipay’s system architecture, detailing its core components such as payment processing, accounting, settlement, and transaction modules, and introduces the open‑source Java‑based distributed messaging middleware Metamorphosis (MetaQ), highlighting its features, advantages over Kafka, and suitable use cases.
This article explains the RESTful architectural style, detailing its core constraints such as resource identification, representation, stateless state transfer, and the uniform interface, and compares REST with RPC while outlining Java frameworks and multi‑layer designs for building scalable backend web services.
This article presents a step‑by‑step migration plan from ActiveMQ to Kafka, covering system dependencies, message type classifications, VirtualTopic usage, and concrete strategies for consumer, producer (1‑1, 1‑N) and self‑consume scenarios to ensure a smooth, zero‑downtime transition.
This article demonstrates how to build an HTTP/2 server and client in Go, covering TLS certificate generation, server and client implementations, switching between HTTP/1.1 and HTTP/2, server‑push handling, and full‑duplex echo communication with complete code examples.
This article explains the fundamentals of Remote Procedure Call (RPC), covering its definition, architectural components, communication protocols, serialization process, complete call workflow, and the main technologies and frameworks used in modern backend systems.
This guide outlines a step‑by‑step method for newcomers to quickly grasp an organization’s entire project ecosystem—identifying source code locations, deployment environments, mapping front‑end pages to back‑end services and databases, and organizing key tables and controller interfaces for long‑term success.
This guide introduces Lua’s concise syntax, tiny footprint, and performance strengths, explores typical use cases such as security, web APIs, and game servers, then walks through core language features, OpenResty integration, deployment steps, and a hands‑on exercise for building a redirect service.
This article walks readers through the complete process of creating an IntelliJ IDEA plugin—from installing the SDK and setting up a project, to defining actions, handling UI threads, using background tasks, and exploring core concepts such as VFS and PSI—providing practical code examples and references for further learning.
