This article provides a detailed overview of the latest Spring Boot 2.4.4 and Spring Cloud 2020.0.2 releases, highlighting key module upgrades, bug fixes, documentation improvements, and dependency updates, helping developers understand the enhancements and how to integrate them into their Java applications.
This article compares REST and GraphQL, highlighting REST's issues like excessive round‑trips, over‑/under‑fetching, and rigidity, and shows how GraphQL solves them with single‑request queries and flexible data selection, while offering guidance on when to choose each approach.
This article examines the chronic decay of a complex warehouse inbound/outbound system, analyzes its tangled business logic and chaotic architecture, and presents a domain‑driven design solution with onion architecture, CQRS, and practical implementation steps to achieve clearer boundaries, higher cohesion, and sustainable evolution.
This tutorial explains PHP's foreach loop syntax, illustrating how to iterate over arrays with value-only and key‑value formats, and how to traverse object properties, accompanied by complete code examples for each case.
This article introduces SOFABoot, an open‑source framework built on Spring Boot that adds readiness checks, classloader isolation, log space isolation, seamless SOFA middleware integration, modular development support, and provides a starter‑based programming model for large‑scale microservice architectures.
This article outlines practical software design principles—layered architecture, single responsibility, data redundancy, security, concurrency, and API design—derived from real‑world financial platform projects, showing how concrete rules help avoid coupling, data loss, and performance pitfalls.
This article presents a curated list of fifteen Alibaba‑originated developer tools—including Arthas, Cloud Toolkit, ChaosBlade, Docsite, and more—detailing their purpose, typical use cases, tutorial links, and acquisition methods to help backend engineers boost productivity and reliability.
The article shares a senior developer’s firsthand observations on how architects differ in attitude, technical depth, system‑level responsibilities, and collaboration, offering practical steps and mindset changes needed to transition from senior engineering to a full‑stack architecture role.
The article examines typical criticisms of the Lombok library—JDK compatibility, forced adoption, reduced readability, increased coupling, and perceived drawbacks—while providing detailed rebuttals that argue Lombok remains useful for Java backend development despite these concerns.
This article explains how to implement delayed message delivery in RabbitMQ using the delayed‑message‑exchange plugin and Spring Boot, covering the shortcomings of traditional approaches, configuration of exchanges and queues, sending messages with delay headers, and a test demonstrating a 6‑second delayed receipt.
The article outlines how a call platform’s architecture progressed through successive stages—starting with a monolithic design, then business service splitting, service governance and isolated deployment, horizontal scaling, distributed database sharding, and finally micro‑service adoption—highlighting the problems each evolution solved and the new challenges introduced.
This article explains the evolution, relationships, and dependencies of Java logging libraries such as Log4j, JUL, JCL, SLF4J, and Logback, and provides practical guidance on configuring adapters, solving common conflicts, and unifying logging output across frameworks like Spring.
Midway Serverless 2.0 (codenamed “Hercules”) revamps the original framework with unified decorators, a modern CLI, faster Vite‑based builds, enhanced testing, and seamless integration of traditional web frameworks, delivering a smoother, more efficient serverless development experience.
This article provides an in‑depth exploration of Linux’s epoll mechanism, covering its blocking behavior, kernel‑level processing, NAPI optimization, comparisons with select/poll, and practical insights into I/O multiplexing, helping backend engineers understand performance characteristics and design efficient network services.
This article explains how to integrate FluentValidation into ASP.NET Core for robust model validation, covering installation, defining validators, registering services, handling validation errors, conditional rules, cascade modes, asynchronous validation, and advanced features, with complete code examples.
This tutorial explains how to replace the default Swagger UI with Swagger‑Bootstrap‑UI (now called Knife4j) in a Spring Boot application, covering Maven dependencies, configuration classes, common annotations, a sample controller, launch steps, and troubleshooting tips.
This tutorial walks you through upgrading Spring Boot, introduces MongoDB basics, and provides a hands‑by‑step guide to adding the spring‑boot‑starter‑data‑mongodb dependency, defining entity and repository classes, writing unit tests, and configuring connection properties for robust backend data management.
This guide walks you through installing Node.js on various Linux distributions by using NVM for version management, native package managers for stable releases, and the NodeSource repository for the latest versions, complete with commands, verification steps, and troubleshooting tips.
This article details ByteDance's evolution from offline ClickHouse ingestion to a robust real‑time analytics pipeline, covering external transaction handling, risks of direct INSERTs, recommendation and ad‑delivery use cases, Kafka Engine design, multi‑threaded consumption, fault‑tolerance improvements, platform tooling, and future roadmap.
This article explains how to secure app open‑API endpoints by using HTTPS, token‑based authentication, timestamp validation, and a URL‑signature algorithm implemented in Java, including detailed steps, interception rules, and sample code for generating and verifying signatures.
A curated list of free Bilibili video courses covering Java, computer networks, operating systems, Redis, RocketMQ, Kafka, and MySQL, each with brief descriptions and direct links for beginners and intermediate learners.
HHVM 4.98 has been officially released, ending support for version 4.92 while continuing maintenance for 4.93‑4.97 and LTS releases, introducing minor typechecker improvements, new error detection for conflicting constants, and outlining future deprecations such as the inst_meth function and stricter string concatenation rules.
An in‑depth analysis reveals that Dubbo 2.7.x fails to propagate provider‑side implicit parameters back to the consumer because the new AsyncRpcResult/AppResponse architecture discards attachments, a change introduced for better async support, effectively making this behavior a bug in the 2.7 series.
This article walks through creating a WebSSH solution from scratch using Spring Boot, WebSocket, JSch and the xterm.js front‑end library, covering dependency setup, backend WebSocket configuration, message handling, SSH session management, and a minimal HTML/JS client to display a browser‑based terminal.
Netflix’s Domain Graph Service (DGS) framework, now open‑sourced, provides a Spring Boot‑based, annotation‑driven solution for building both standalone and federated GraphQL services, offering schema‑first and code‑first development, code generation, testing tools, and seamless integration with Netflix’s tracing and security infrastructure.
The article explains the core concept of Inversion of Control (IoC), how a third‑party container manages resources to reduce coupling, illustrates the idea with everyday examples, and clarifies the related terms dependency injection and control inversion, especially in the context of Spring.
iQIYI built a Netty‑based WebSocket long‑connection gateway that centralizes session management, uses RocketMQ for cluster‑wide broadcast, provides a simple HTTP push API, scales horizontally to millions of connections, integrates Prometheus/Grafana monitoring, and dramatically cuts development effort for real‑time features such as comments and authentication.
This article explains how to secure mobile app open APIs by enforcing HTTPS, designing request signatures with timestamps and tokens, validating them on the server, and managing token‑UID relationships using Redis, complete with Java code examples for parameter extraction and signature generation.
This article explains the origins of Nginx, compares it with Apache, describes why Nginx gained popularity, details forward and reverse proxy concepts, and outlines the various load‑balancing algorithms it supports, providing a comprehensive overview for backend developers and operations engineers.
This article explains the fundamentals of unit testing in Spring Boot, covering the purpose of unit tests, how to add the spring-boot-starter-test dependency, the role of MockMvc for controller testing, step‑by‑step creation of Service and Controller test classes, key annotations, assertion techniques, and a brief comparison with Postman.
The article explains Spring's warning about field injection, compares constructor, setter, and field injection methods with code examples, outlines the drawbacks of field injection such as final‑field incompatibility, hidden dependencies, and tight IOC coupling, and recommends using constructor injection for required beans and setter injection for optional ones.
This article explains why stopped services may still be called through Eureka, shows how to adjust eviction and lease settings in the registry and client, and presents three active methods—including direct shutdown, DELETE requests, and client‑initiated deregistration—with code examples for Spring Boot applications.
This article explains the design and implementation of Java 8 Stream API, covering its composition, pipelining, internal iteration, parallel execution via ForkJoinPool, performance considerations, ordering semantics, and practical guidelines for using parallel streams effectively.
This article summarizes the DBLE network module, describing its key classes such as NIOAcceptor, NIOReactor, and SocketWR, explaining how client connections are accepted and processed, and highlighting the importance of low‑level network I/O knowledge for middleware development.
This article explains the role of OAuth2AuthorizationCodeAuthenticationProvider in Spring Security, details how OAuth2AccessTokenResponseClient obtains access tokens, shows how to customize the token endpoint, and walks through the complete token‑retrieval flow with code examples and step‑by‑step analysis.
This article explains why large tables hurt performance, defines database sharding and its vertical and horizontal strategies, compares partitioning by key, size, or time, and outlines practical implementation options and migration steps for robust, scalable backend systems.
The OpenAPI Specification 3.1.0 has been released, introducing a top‑level jsonSchemaDialect field, updated JSON Schema support, refined URI handling, enhanced file‑upload descriptions, and numerous clarifications that modernize API description and improve consistency across implementations.
This article explains how Spring Boot’s auto‑configuration works, introduces the most frequently used annotations such as @Value, @ConfigurationProperties, @Import and @Conditional, and provides practical code examples to illustrate the underlying mechanisms and startup process of a Spring Boot application.
Spring Boot 2.4.3, released on the first workday of the new year, brings 29 bug fixes, 15 documentation improvements, and 31 dependency upgrades—including critical fixes for DataSourceBuilder, Amazon Redshift driver detection, JPA lazy repositories, and Spring Data Solr—while the full changelog is available on GitHub.
Spring Boot 2.4.3, the third patch of the 2.4 line, introduces 75 bug fixes, enhancements, documentation updates, and dependency upgrades, including UTF‑8 logging defaults, Neo4j/MongoDB startup fixes, Redshift driver recognition, and numerous improvements to testing, security, and monitoring components.
This guide explains how to combine Spring Cloud's service registration and discovery with RSocket, covering naming conventions, Consul setup, RSocket service implementation, client load‑balancing, broker mode support, and developer‑experience enhancements for robust backend communication.
This article explains how to add a custom banner.txt to a SpringBoot project, lists several online ASCII‑art generators for banner creation, and provides step‑by‑step instructions for installing and configuring the JetBrains agent.jar to activate IntelliJ IDEA licenses.
This article explains the principles of long polling used by configuration centers like Nacos and Apollo, compares it with traditional polling and push models, and provides a complete Java demo showing client and server implementations for dynamic configuration updates.
Effective API design is crucial for microservice architectures, reducing communication overhead, preventing API decay, and ensuring scalability; this article outlines common pitfalls, core design principles such as simplicity, focus, extensibility, compatibility, thorough testing, and documentation to help developers build robust, maintainable services.
This article explains the fundamentals of distributed ID concepts, compares common generation schemes such as UUID, database auto‑increment, Redis counters, and the Snowflake algorithm, details the Snowflake structure and Java implementation, and reviews open‑source components like Meituan Leaf and Baidu UidGenerator.
This article explains Nginx's high‑performance architecture, covering its daemon mode with master and worker processes, the thundering‑herd problem, advantages of process‑based concurrency, asynchronous non‑blocking I/O, connection handling, keep‑alive and pipeline techniques, as well as key internal data structures such as arrays, queues, lists, strings, memory pools, hash tables, and red‑black trees.
The author shares a personal journey from senior Java developer to aspiring architect, reflecting on interview mishaps, the pitfalls of over‑focusing on code, the importance of leveraging existing components, integrating them effectively, and applying design patterns for reusable, maintainable high‑concurrency systems.
This article introduces kk-anti-reptile, a Spring Boot‑based anti‑crawler filter that uses Redis, implements ip‑rule and ua‑rule, returns HTTP 509 with various captchas, and provides step‑by‑step Maven, configuration, and Axios front‑end integration instructions.
This guide explains how to embed Seata‑Golang’s AT and TCC distributed‑transaction modes into Go microservices, covering global transaction proxy creation, XID propagation via HTTP, Dubbo and gRPC, branch transaction handling, and the required code interfaces and implementations.
This tutorial walks you through creating a Django project, configuring RSA keys, setting up Alipay sandbox credentials, writing a Python Alipay class, building front‑end pages, and wiring view functions and URLs to enable PC‑side Alipay payments.
Although malloc is a universal allocator, its lack of scenario-specific optimization makes it unsuitable for high‑performance server applications; this article explains malloc’s internal workflow, compares it with custom memory‑pool techniques, and details various pool designs, thread‑safety strategies, and an interesting cross‑thread free problem.
This article explains how Java's ThreadLocal class provides a thread‑local storage mechanism that creates independent object instances for each thread, improving scalability and performance compared to synchronized blocks, and demonstrates its usage with practical code examples and best‑practice guidelines.
DiDi’s NodeX initiative unites multiple front‑end teams to create a group‑level, professional, efficient, and stable Node.js development ecosystem that provides reusable components, a unified framework, common services, performance‑analysis tools, and documentation platforms, dramatically lowering service‑building barriers and boosting business productivity.
The article traces the evolution of software architecture—from monolithic applications through vertical splitting, distributed services, and finally microservices—detailing their advantages, drawbacks, and the essential technology stack such as service discovery, API gateways, authentication, logging, containerization, orchestration, and CI/CD, while providing practical examples and references.
This article explains the Java naming conventions for boolean and Boolean fields, why using the isXXX prefix can cause serialization issues in RPC frameworks, and recommends using wrapper types for POJO properties while keeping primitives for local variables.
This guide explains what JRebel is, why it speeds up Java web development, and provides step‑by‑step instructions for installing it via Tomcat startup parameters or the IntelliJ IDEA plugin, including configuration of deployment settings and VM options for Windows, Linux, and macOS.
This article explores nine key Spring framework design patterns—including Simple Factory, Factory Method, Singleton, Adapter, Decorator, Proxy, Observer, Strategy, and Template Method—detailing their implementation, underlying principles, and practical code examples, while highlighting how they enable loose coupling and extensibility in backend development.
The article outlines JDK 16’s upcoming release timeline, highlights its new features such as sealed classes, strong encapsulation, foreign linker API, vector API, Unix‑domain sockets, and jpackage, and notes that Java 17 will follow as the next LTS version, inviting readers to share their expectations.
iQIYI created a GraphQL‑based Backend‑for‑Frontend layer that functions as a low‑code API generation platform—leveraging graphql‑java, REST integration, Prometheus monitoring, Velocity‑driven schema templates, and a visual console—to streamline micro‑service aggregation, cut duplicate development, accelerate front‑end delivery, and outline future scaling and migration challenges.
This guide explains the new WeChat service account subscription message workflow, covering terminology, user subscription steps via JSSDK, handling callback XML, and sending notifications through the official API, while also addressing common integration challenges.
This article presents a comprehensive Spring Boot project template for backend development, detailing README guidelines, one‑click local build scripts, business‑oriented package structure, automated test classifications, logging, exception handling, distributed locks, code style, static analysis, health checks, API documentation, database migration, multi‑environment setup, CORS configuration, and recommended third‑party libraries.
This article explains Netty’s core architecture and its master‑worker multi‑reactor thread model, detailing the roles of Acceptor, Main Reactor, and Sub Reactor, how connection handling, I/O, encoding/decoding, and business logic are coordinated across threads, and provides practical insights for interview preparation.
This article explains how to protect front‑back separated APIs using a request signature scheme, detailing the required parameters, signature generation algorithm, Java filter implementation, anti‑leech timing checks, nonce usage, and duplicate‑submission prevention with Redis.
This article compares Apache Pulsar and Apache Kafka, outlines Kafka's operational pain points, details Pulsar's architecture and features, provides step‑by‑step installation and code examples for Pulsar clients, and discusses when to choose Pulsar over Kafka.
This tutorial introduces RSocket—a reactive, binary, multiplexed protocol—and demonstrates how to install the RSC client, create a Spring Boot RSocket server, and implement all four interaction models (request‑response, fire‑forget, stream, and channel) with complete code examples.
This article introduces microservice architecture, outlines its challenges, explains the concept and evolution of Service Mesh—including sidecar patterns, Linkerd, and Istio—and details ByteDance's internal MS platform features such as call‑chain tracing, keyword search, monitoring, and inbound traffic control.
This article compares the main HTTP API design styles—REST, RPC, and GraphQL—explaining their principles, typical code examples, and trade‑offs, and also discusses serialization formats such as protobuf and JSON, helping backend developers choose the most suitable approach.
This guide shows how to use Spring Boot’s configuration metadata processor to automatically generate metadata for custom properties, eliminating IDE warnings and enabling intelligent code completion in your backend applications while keeping your project clean and maintainable.
Node.js Technical Committee chair Michael Dawson explains the community‑driven development model, details the four‑type release schedule, highlights upcoming features such as ECMAScript Modules, AsyncLocalStorage and AbortController, and outlines strategic initiatives and working groups shaping the runtime’s future.
This tutorial walks through configuring a Django project to use MySQL instead of the default SQLite, covering database creation, settings adjustments, required package installation, migrations, and a complete example with URLs, views, templates, and server startup.
This article explains how to integrate WebSocket into a Spring Boot application, covering the protocol basics, Maven dependencies, configuration classes, server endpoint implementation, controller and front‑end code, and troubleshooting tips for full‑duplex real‑time communication.
This article explains the shift from x86 to ARM architectures, outlines why services should be migrated to ARM‑based Kunpeng cloud servers, describes Huawei's migration tools and community support, and provides concrete C/C++ migration examples and common pitfalls for backend developers.
This article explains the need for marketing automation, analyzes requirements, proposes system capabilities, presents a four‑layer architecture inspired by IDE/JVM concepts, and details the FSM‑based engine model with trigger, action, and execution strategies for complex multi‑step marketing scenarios.
This article compares the four major API architectural styles—RPC, SOAP, REST, and GraphQL—detailing their mechanisms, strengths, weaknesses, and typical use cases, and provides guidance on selecting the most suitable style for a given project.
This article presents a complete Java-based parking system example, detailing functional requirements for users and administrators, and providing full source code for client interaction, entity definitions, service interfaces, and their implementations, illustrating backend development concepts such as singleton patterns, service layers, and basic CRUD operations.
This article explains why Lombok-generated getter/setter methods for fields whose second character is uppercase can cause MyBatis to store null values, shows the MyBatis PropertyNamer logic that leads to the problem, and also describes how the @Accessor(chain=true) annotation interferes with EasyExcel's reflection‑based export, offering practical workarounds for both issues.
The article explains PHP’s built‑in cosh() function, describing its purpose of returning the hyperbolic cosine of a given float argument, detailing the parameter and return value, and providing several example calls with expected numeric outputs.
Spring Boot 2.4.2 and 2.3.8.RELEASE are now available via Maven, introducing a new PropertySource API, numerous bug fixes ranging from HikariDataSourceMetrics issues to Kubernetes volume support, and extensive configuration changes, with full details in the official GitHub release logs.
This article explains PHP’s cos() function, detailing its purpose of returning the cosine of a radian argument, describing the arg parameter, the return value, and providing a sample code snippet that demonstrates its usage and expected output.
Facing high memory usage and slow startup after containerizing its Java services, NetEase Media adopted Go in 2020, leveraging its fast compilation, low‑resource footprint and goroutine‑based concurrency to build the high‑performance Ngo framework, which outperforms Spring‑Boot in throughput while using far less memory.
IQ运营位 is a unified operational configuration platform for iQiyi’s overseas app that replaces costly, slow, inflexible marketing resource management with JSON‑modeled, versioned data stored across Redis caches, SDK‑driven client caching, and layered services, cutting deployment time to under five minutes while improving stability and scalability.
This guide explains why multiple Netty jar versions cause runtime errors, shows how to use the Arthas tool to inspect loaded classes and methods, and provides Maven commands and pom.xml techniques to locate and eliminate version conflicts in Java backend projects.
This article presents a detailed Java learning roadmap covering fundamentals, core language features, the Spring framework, microservices, databases, DevOps tools, project experiences, and soft skills, guiding beginners to become proficient backend developers.
The article compares Spring Data JPA and MyBatis, highlighting that while Spring Data JPA speeds up individual development, it can create maintenance challenges for teams, especially when tracking slow queries, and argues that MyBatis may be a better choice for collaborative projects.
This article explores common pitfalls in technical communication, offers practical questioning techniques, and demonstrates how to simplify complex concepts such as RPC and service registries using the Feynman method, enabling engineers to convey ideas clearly and improve collaboration efficiency.
This guide explains Nginx’s core concepts—including reverse and forward proxy, load‑balancing strategies, static‑dynamic separation, essential commands, configuration file structure, practical reverse‑proxy setups, load‑balancing implementations, and high‑availability clustering with keepalived—providing a complete roadmap for building robust backend services.
This article introduces four approaches—simple time‑difference calculation, StopWatch‑like utilities, functional interfaces, and AutoCloseable—to accurately measure arbitrary code segment durations in Java, providing code examples and discussing their advantages and trade‑offs.
This article introduces MyBatis-Plus, explains its non‑intrusive features, demonstrates how to add Maven dependencies, examines the built‑in batch insert API, and provides step‑by‑step code to extend BaseMapper with a custom EasyBaseMapper for efficient MySQL batch inserts.
This article explains the fundamentals of Remote Procedure Call (RPC), provides a complete Java RPC demo, introduces the Dubbo distributed RPC framework with its layered architecture, SPI extension mechanism, service exposure and reference processes, and discusses clustering, fault‑tolerance and load‑balancing strategies for building robust backend services.
This article explains PHP’s atan() function, detailing its signature, parameter description, return value in radians, and provides multiple code examples demonstrating how different inputs produce corresponding inverse tangent results, including positive, negative, and large magnitude numbers, along with the exact numeric outputs.
This article explains how a lightweight API gateway works together with an object‑model‑driven API development platform to manage the entire API lifecycle—including design, development, monitoring, governance, testing, documentation, rule processing, service composition, and source‑code export—while keeping protocol conversion and data mapping out of the gateway.
This article examines four major API architectural styles—RPC, SOAP, REST, and GraphQL—detailing their mechanisms, advantages, disadvantages, and typical use cases, and provides guidance on selecting the most suitable style based on project requirements and constraints.
Gaode’s navigation service adopted test‑driven development using Google’s GTest to replace slow diff‑based checks with fast, lightweight unit tests, enabling incremental refactoring of legacy code, improving quality, handling data‑dependency challenges, and demonstrating that writing tests first clarifies requirements while adding minimal overhead.
Applying Domain‑Driven Design and Hexagonal architecture to a reward service clarified domain boundaries, cut integration, middleware and onboarding costs by up to 30 %, streamlined unit‑test creation, and enabled a layered, framework‑independent codebase with entities, value objects, services, events, aggregates and factories that improve maintainability, scalability and testability.
This article presents a comprehensive set of mandatory and recommended conventions for MySQL table creation, SQL writing, and index design, aiming to improve backend development efficiency, reduce erroneous DDL and queries, and enhance overall database performance.
This tutorial explains how to add file‑upload functionality to a Spring Boot application, covering project setup, template engine configuration, HTML upload page creation, controller implementation, property settings, testing steps, and where to find the full source code.
This article introduces JMH, the Java Microbenchmark Harness, explains why traditional main‑method benchmarks are unreliable, and provides step‑by‑step instructions, code examples, and best‑practice annotations for accurately measuring method‑level performance in Java applications.
This article details the implementation of a real-time push system for new house listings based on user search subscriptions.
This article explains how MyBatis supports plugins, covering configuration, how to write an Interceptor, the runtime mechanism, registration timing, initialization process, and the principles behind pagination plugins, with detailed code examples and annotations.
This article provides a detailed walkthrough of Postman, covering its core and advanced features, installation steps, interface navigation, how to send various types of requests, response analysis, collection management, batch execution, logging, assertions, variables, pre‑request scripts, request chaining, and techniques for extracting values from complex JSON responses.
