This article explains PHP's list() function for array destructuring, covering basic usage, advanced techniques such as ignoring values, handling multidimensional arrays, swapping variables, and processing function-returned arrays, along with important caveats and practical code examples.
This article explains three ways to inject a specific service implementation in Spring—using @Qualifier with @Autowired, using @Resource with type or name attributes, and naming @Service beans—detailing their semantics, bean‑matching rules, and providing complete code examples for each approach.
This article explains how to use HTTP Range headers for resumable downloads, how to detect server support, the relevant status codes, proper Range syntax, error handling, and provides a complete Spring Boot example that integrates with Ceph storage to serve partial file content.
This article presents a comprehensive overview of a typical payment system architecture, describing the transaction core, payment core, service governance, asynchronous processing, performance testing, and practical production practices, while illustrating each component with diagrams and implementation details.
This article reviews Java’s default class‑loading mechanism, explains the parent‑delegation model, discusses how it can be broken, and details Tomcat’s custom class‑loader architecture that intentionally deviates from the standard delegation to achieve web‑application isolation and hot‑swap capabilities.
This article explains the eight built‑in Spring Security permission annotations, how to enable them with @EnableGlobalMethodSecurity, provides Java code examples for each annotation, and demonstrates their practical use in the Codeape Chronic Disease Cloud Management System for fine‑grained microservice authorization.
This guide explains how to enforce user‑role based data access in MyBatis‑Plus by creating a custom annotation, building an InnerInterceptor that modifies SQL WHERE clauses, configuring the interceptor in the MyBatis‑Plus plugin, and extending the approach to handle department‑level and self‑only scopes.
This article examines traditional file transfer methods, highlights their performance drawbacks caused by excessive context switches and memory copies, and explains how zero‑copy, PageCache, asynchronous I/O, and direct I/O can dramatically improve throughput and reduce CPU usage in backend systems.
This tutorial explains how to integrate Dataway—a UI‑driven API configuration tool based on DataQL—into a Spring Boot application by adding the required Hasor dependencies, configuring Dataway properties and database tables, setting up the data source, enabling Hasor, and finally creating and publishing APIs using both SQL and DataQL modes.
Learn how to enable and configure transparent caching in Spring Boot 2.3 using JSR‑107 annotations and Ehcache, covering annotation usage, custom key generators, service and controller implementation, Maven dependencies, YAML and XML settings, and practical testing of cache put, get, and removal operations.
This article reviews six theoretical approaches for maintaining MySQL‑Redis data consistency, evaluates their pros and cons, and presents a practical implementation using Java Spring, transactional updates, cache deletion, and asynchronous queue handling to achieve both real‑time and eventual consistency in high‑concurrency systems.
This article explains Kafka's core architecture—including topics, producers, brokers, and consumers—its underlying mechanisms, the role of Zookeeper, key characteristics such as high throughput and fault tolerance, and common use cases like log collection, activity tracking, and stream processing.
This article introduces AviatorScript, a high‑performance, lightweight JVM‑hosted scripting language for rule engines, covering its origins, key features, quick start with Maven, core syntax, control structures, custom functions, and real‑world use cases such as client version control, marketing rules, and order risk management.
This guide explains how to customize the serialization and deserialization of Date objects in SpringBoot by adjusting application.yml/properties, using @JsonFormat, @DateTimeFormat, and @Temporal annotations, and by creating global converters for both form submissions and JSON payloads, ensuring consistent timezone handling.
This article explains why transaction control is essential for database‑backed applications, compares native JDBC/MyBatis handling with Spring's unified approach, details the core transaction APIs, and walks through the AOP‑based mechanism—including @EnableTransactionManagement, proxy generation, and CGLIB interception—that automatically opens, commits, and rolls back transactions at runtime.
This article explains MyBatis dynamic SQL, its execution principle, and the nine core XML tags (if, where, set, choose, trim, foreach, sql, include, resultMap) with detailed examples of CRUD operations, conditional queries, batch processing, and association mappings for Java backend development.
This article introduces a Java‑based private cinema reservation system built on Spring Boot and MyBatis, outlines its core technologies, provides step‑by‑step deployment instructions, and details all functional URLs and the source‑code download method.
The article describes the background, overall architecture, backend management console, and client implementations (Nginx and Java) of JD.com's unified header/footer system, explaining how it enables rapid, centralized updates across hundreds of services using push/pull distribution, SSI, and caching techniques.
This article examines MyBatis-Plus, highlighting its convenient CRUD shortcuts and pagination features while warning about maintenance challenges, magic strings, and limited support for complex SQL, and offers practical recommendations for using LambdaQueryWrapper and organizing queries in backend Java projects.
This article introduces Fluent Mybatis, a Java ORM framework that enhances Mybatis with features from Mybatis Plus and JPA, demonstrates its core concepts, compares it with native Mybatis and Mybatis Plus through a student score query example, and provides step‑by‑step setup, code generation, and CRUD usage.
This article explains how Nginx can be used to achieve various load‑balancing strategies—including round‑robin, least‑connections, IP hash, generic hash, least‑time, and random—provides detailed configuration examples, shows how to integrate Nginx with SpringBoot services, and outlines testing and deployment steps.
This article explains how RaftKeeper leverages the Raft consensus algorithm to create a high‑availability, high‑performance ClickHouse cluster across multiple data centers, covering project background, architecture, core features, performance optimizations, and real‑world deployment results.
This article explains Eureka's role as a Spring Cloud service registry, detailing its definition, core functions of registration and discovery, basic architecture, operational principles, and a step‑by‑step workflow that enables reliable microservice communication.
This article introduces MyBatis-Flex, a lightweight high‑performance MyBatis enhancement framework, outlines its key features, compares it with MyBatis‑Plus and Fluent‑MyBatis, lists supported databases, and provides a step‑by‑step quick‑start tutorial with code examples.
The article recounts a Go project's evolution of configuration handling—from hard‑coded DB credentials to a unified global struct and finally an init‑based implicit loader—highlighting how each teammate’s approach reflects distinct mindsets, knowledge gaps, and productivity trade‑offs, and invites readers to consider their own collaboration preferences.
This article explains Apache Pulsar's message redelivery mechanisms—including consumer flow, AckTimeout, NegativeAck, retry queues (RLQ), and dead‑letter queues (DLQ)—and provides concrete code examples for configuring each approach in Java clients.
This article explains the concept of Inversion of Control (IOC), its implementation in the Spring framework, and the step‑by‑step process of dependency injection using reflection, helping developers understand how to decouple Java components for more maintainable backend systems.
This article examines the ongoing debate around MyBatis‑Plus, highlighting its convenience for simple CRUD operations, the maintenance challenges it introduces, and practical guidelines—such as using LambdaQueryWrapper and pagination plugins—to decide when the framework is appropriate for Java backend projects.
This guide explains how to achieve reliable message consistency in a Spring Boot 2.3.9 application using RocketMQ 4.8.0 by outlining the transactional message flow, broker handling, project structure, code implementation, and testing procedures.
Spring Startup Analyzer is an open-source tool that captures Spring Boot startup data, generates interactive reports, and offers async bean initialization to speed up launches, with detailed statistics, bean timelines, method call metrics, unused JAR detection, and flame-graph visualizations, plus step-by-step usage instructions.
The article recommends two essential Google SRE books for backend developers, explains what SRE is, how it differs from traditional operations, and shows how the concepts like SLI/SLO, incident postmortems, and reliability engineering can be applied to improve system availability and stability.
This article reviews several Java backend technologies—JSP, Struts, Hibernate, Servlet, and others—explaining why they are considered outdated or unnecessary for modern development and offering guidance on what newcomers should focus on instead.
This article explains how to enable cross‑node WebSocket communication in a distributed Spring application by publishing messages to a Redis or Kafka topic, tracking user connections, and routing messages to the appropriate server instance, complete with full code examples and configuration details.
This article explains RocketMQ transaction messages by covering their use cases, underlying mechanisms, and a step‑by‑step implementation that demonstrates how to ensure eventual consistency between message production and local database transactions in distributed Java back‑end systems.
This article dissects ten common traps when implementing Redis distributed locks—such as non‑atomic setnx/expire, missing expirations, lock release ordering, non‑re‑entrancy, master‑slave replication issues, and the Redlock algorithm—while providing concrete code examples and practical remedies.
This article explains how Spring Cloud Gateway (Hoxton.SR11) creates and configures predicate factories, binds their Config objects, builds Route objects, caches them with CachingRouteLocator, and finally matches incoming requests to the appropriate route using asynchronous predicates.
This article details how a rapidly expanding B2B fresh‑food company restructured its R&D organization, adopted a matrix management model, and built a comprehensive distributed infrastructure—including task scheduling, service discovery, messaging, logging, file storage, CDN, configuration, sharding, search, caching, and monitoring—to support nationwide warehouse operations and future growth.
Didi’s ride‑hailing order testing has progressed from manual device‑simulated orders to a tool‑based framework and now a self‑service visual platform that lets engineers drag‑and‑drop, share, and auto‑populate scenarios, dramatically cutting effort while supporting hundreds of test cases for thousands of monthly users.
This article explains the PHP array_slice() function, covering its basic syntax, practical examples for extracting sub‑arrays, using negative offsets, selecting specific keys with array_flip and array_intersect_key, and removing elements via array_splice, providing clear code snippets and output demonstrations.
This guide walks through designing a User_Token table, defining roles and APIs, implementing QR‑code generation and validation endpoints, and wiring a Spring Boot WebSocket server with front‑end AJAX to achieve secure, real‑time QR‑code login for Android, web and PC clients.
This article curates the most valuable Spring I/O 2023 video sessions—covering the latest Java version adaptations, Spring Framework and Boot innovations, cloud‑native deployments, security, observability, and architectural best practices—providing concise Chinese summaries so developers can quickly identify which talks merit deeper viewing.
After a massive message backlog in RocketMQ, the author discovered that identical clientIds generated by Docker containers using host network mode caused broker load‑balancing errors, leading to slow consumption; the article explains the root cause, code analysis, and how setting a unique clientId resolves the issue.
This article deeply analyzes Kafka broker’s network architecture and request‑handling pipeline, walking through simple sequential models, multithreaded async designs, the Reactor pattern with Java NIO, key thread roles, core processing flow, and practical tuning parameters for high‑throughput, low‑latency deployments.
This article introduces Spring 6.1’s new synchronous RestClient, showing how to perform basic GET and POST requests, convert responses to objects, handle errors with onStatus, and use the advanced exchange method for custom request‑response processing, positioning RestClient as a modern replacement for RestTemplate.
This article dissects the inner workings of Netflix’s Zuul gateway, contrasting its servlet‑based blocking model with Spring Cloud Gateway’s reactive approach, and walks through route collection, handler registration, request processing, and filter loading, complete with key Java code examples.
This tutorial explains how to generate export classes in Laravel, implement array, query, or collection exports, customize column headers, download files directly, specify file names, formats, response headers, store exports to disk, set document options, and reuse exports with traits, all using the Lysice XlsWriter package.
This tutorial explains how to install the CURL extension, retrieve a remote image with file_get_contents, create a local directory, generate a unique filename, and save the image using file_put_contents in PHP, providing a complete, step‑by‑step guide for developers.
This guide introduces Insomnia, an open‑source cross‑platform API client, walks through its installation, demonstrates how to import and test SpringBoot‑based mall project APIs, and highlights useful settings, offering a concise alternative to heavier tools like Postman.
This article explains how MyBatis implements first‑level (session) and second‑level (cross‑session) caches, the conditions required for each to work, why the first‑level cache often fails in Spring Boot without transactions, how to enable and use the second‑level cache safely, and the hidden risks of stale data when different mappers share related tables.
The article explains why the error "Transaction rolled back because it has been marked as rollback‑only" occurs in a Java Spring service when using MyBatis‑Plus saveBatch, how hidden @Transactional annotations cause hidden nested transactions, and presents a practical workaround by replacing the batch operation with a custom mapper.
This article explains the PHP strlen() function, covering its basic syntax, required parameter, return value, and provides two code examples that demonstrate how to obtain the length of regular strings and strings containing special characters or escape sequences.
This article introduces a curated collection of IntelliJ IDEA plugins—ranging from essential productivity tools and decorative themes to convenient utilities—explaining how each plugin can enhance Java development efficiency, streamline workflows, and improve code quality for backend engineers.
This article explains PHP's __invoke() magic method, showing how defining __invoke() allows an object to be called like a function, demonstrates usage with a Person class example, and notes version requirements and error behavior when misused.
This article introduces the most useful Spring Boot utility classes—including Assert, ObjectUtils, StringUtils, CollectionUtils, FileCopyUtils, ResourceUtils, StreamUtils, ReflectionUtils, and AOP helpers—explaining their purpose, key methods, and code examples to help Java developers write cleaner, more efficient backend code.
This article explains how to replace JWT with a Redis‑backed Spring Security OAuth2 solution, detailing token storage, client types (WEB, PDA, PAD, patient app, mini‑program), password‑mode login requests, encryption of credentials, gateway filters, authentication converters, providers, token generation, persistence in Redis, and success handling, all illustrated with code snippets and diagrams.
Scrapy is a powerful Python-based web scraping framework designed for large-scale and complex website data extraction. It offers high-level abstractions, built-in data extraction tools using XPath and CSS selectors, asynchronous processing for parallel requests, and flexible pipelines for data storage, making it ideal for efficient and scalable web scraping projects.
This guide explains why and how to read open‑source Java code, covering essential JDK knowledge, design patterns, official documentation, module structure, demo‑first approaches, purposeful reading strategies, class‑name clues, class hierarchy analysis, commenting practices, and leveraging related resources.
This article details Baidu Wenku App's backend migration from a PHP‑based stack to Go, covering the motivation, technical debt, technology selection, step‑by‑step migration strategy, quality assurance practices, performance improvements, and key takeaways for large‑scale service refactoring.
This article provides a comprehensive analysis of Node.js, covering its strengths such as asynchronous I/O and JavaScript unification, its weaknesses like CPU‑intensive performance limits, architectural benefits, front‑end influence, practical code examples, and predictions for its role in full‑stack development, cloud, serverless, IoT, AI, WebAssembly, and open‑source ecosystems.
This article explains how MyBatis first‑level (session) and second‑level (cross‑session) caches work, the conditions required for them to function, common pitfalls when integrating with SpringBoot, and step‑by‑step instructions to enable and safely use second‑level caching in real projects.
This article explains ArchUnit's role in automatically detecting and preventing architecture decay in Java codebases, compares it with code reviews and static analysis tools, outlines its advantages and limitations, and provides practical guidance on adoption, rule definition, and team workflow integration.
This guide demonstrates how to integrate Spring Boot 2.3.10 with Elasticsearch 7.8, covering Maven dependencies, application configuration, data model annotations, repository interfaces, custom query methods, and comprehensive JUnit tests using both repository and ElasticsearchRestTemplate approaches.
Spring Cloud 2022.0.3 has been released on Maven Central, bringing compatibility with Spring Boot 3.1.x, numerous feature enhancements across Commons, Gateway, Stream, Function, Config, and Netflix modules, a detailed dependency version list, and a preview of the upcoming 2023 “Leyton” release.
This article provides a comprehensive overview of RocketMQ, covering its origin, core concepts, component roles, cluster deployment architecture, workflow, feature details, persistence mechanisms, and cleanup policies, offering developers a solid foundation for using this high‑performance messaging middleware.
This article presents a detailed curriculum for backend development, covering fundamental concepts and practical topics such as database design and optimization, popular frameworks like Spring and Hibernate, microservice architecture, message middleware (Redis, RabbitMQ, Kafka), common data structures, concurrency, JVM internals, and related interview questions.
This article introduces Spring WebFlux as a reactive, non‑blocking web framework built on Spring 5, explains the concepts of reactive programming, compares it with Spring MVC, and provides practical code examples and guidance on when to choose WebFlux for Java backend development.
This article introduces the Pie framework, a Java-based implementation of the responsibility‑chain design pattern, demonstrates how to integrate it with Maven, shows step‑by‑step code examples for handlers, outbound factories, bootstrapping, and global exception handling, and explains its benefits for clean, maintainable backend development.
This article explains the purpose, differences, and proper usage of Spring validation annotations such as @NotNull, @NotBlank, @NotEmpty, as well as the @Valid and @Validated triggers, providing Maven dependency setup and concrete code examples for effective backend data validation.
This article reviews the latest Mica releases, highlighting version compatibility with Spring Boot, new Redis and XSS features, core utility enhancements, bug fixes, and upcoming support for Spring Boot 3.1.x, providing developers with a concise overview of the library’s recent advancements.
This article details a real‑world Netty long‑connection memory‑leak case, explains how to reproduce the problem, uses Netty's advanced leak detection to pinpoint the faulty ByteBuf usage, and presents three practical remediation strategies to permanently fix the leak.
This article explains how to execute two dependent tasks in parallel with CompletableFuture, why the usual @Transactional annotation fails in a multi‑threaded environment, and provides a programmatic transaction solution that copies Spring's transaction resources between threads to guarantee atomic commit or rollback across all parallel operations.
This article provides a comprehensive tutorial on EasyExcel, a Java library for fast and memory‑efficient Excel processing, covering dependency setup, simple and complex export examples with custom annotations and merge strategies, import handling, and reference resources.
This article presents a detailed Java backend interview recap covering self‑introduction, thread‑pool choices, Snowflake ID usage, List implementations, List vs Set differences, common HTTP status codes, flow and congestion control, URL request flow, TCP three‑way handshake, HTTP vs HTTPS, database index types, B+‑tree advantages, transaction isolation problems, and practical interview preparation tips.
The article explains how Spring’s IoC container, dependency injection, singleton beans, and AOP simplify Java backend development by abstracting object creation, configuration, and cross‑cutting concerns, illustrated with code examples and practical scenarios such as conditional bean loading and Redis client selection.
This article investigates how Spring generates bean names from annotated classes, explains the default lower‑casing rule, highlights the special case when the first two characters are uppercase, and shows the underlying JDK decapitalize method through source‑code exploration.
This article walks through the Mall project's product module—covering its architecture, feature design, database schema, and API implementation—while providing links to source code, video tutorials, and a mind‑map that together serve as a comprehensive guide for building robust e‑commerce systems.
This article examines the limitations of BeanCopy for Java DTO mapping—such as inheritance handling, recursive copying, lack of complex type support, performance overhead, and opaque assignments—and demonstrates how MapStruct can address these issues with compile‑time generated, type‑safe mappers.
This article explains cache fundamentals, common use cases, design constraints, and a Go implementation that combines hash‑maps with doubly‑linked lists, LRU eviction, TTL handling, and mutex‑based concurrency control, providing practical code examples and deployment tips.
This article explains what distributed locks are, outlines their essential characteristics and common use cases, compares implementation approaches such as database, Redis, and Zookeeper, and provides step‑by‑step designs—including basic and advanced Redis‑based locks—to handle high‑concurrency inventory reduction safely.
This article explains how MyBatis delegates SQL execution to four core objects—Executor, StatementHandler, ParameterHandler, and ResultSetHandler—detailing their architecture, implementations such as SimpleExecutor, ReuseExecutor, BatchExecutor, and demonstrating three common batch insertion techniques with code examples.
This article explains the concept of coupling, demonstrates how traditional object creation leads to high coupling, and shows how using interfaces, the factory pattern, and reflection—culminating in Spring IOC—can dramatically lower coupling, improve reuse, and simplify maintenance in Java backend development.
This article explains the concept and advantages of plugin-based development, outlines common implementation strategies in Java, demonstrates practical SPI and custom configuration approaches, and shows how Spring Boot’s spring.factories mechanism can be used to build extensible backend systems.
This article introduces Spring WebFlux, a reactive web framework introduced in Spring 5, explains the concept of reactive programming, compares it with Spring MVC, describes its concurrency model, and provides practical code examples for building a WebFlux application with Spring Boot.
The article describes how a finance team tackled a 50‑million‑row MySQL transaction table by analyzing the pain points, defining split goals, selecting sharding‑jdbc, designing multi‑source transaction handling, pagination across shards, data migration strategies, and a staged rollout to ensure stability and performance.
This article explains how Spring MVC handles exceptions, detailing the role of DispatcherServlet, the chain of HandlerExceptionResolver implementations, the controller invocation flow, and the internal mechanisms that resolve errors, including fallback to the default /error endpoint.
The article explains MyBatis first‑level and second‑level caching mechanisms, their activation conditions, integration pitfalls with Spring Boot, and how to enable and use them safely, including configuration steps, code examples, and warnings about hidden risks of second‑level cache.
This article introduces MapStruct, explains the challenges of JavaBean conversion, shows how to add dependencies, define POJOs and DTOs, create mapper interfaces with @Mapper, demonstrates basic and advanced mapping scenarios—including custom methods, nested objects, and dependency injection—while highlighting its performance and debugging benefits.
This article explains how to design and implement a business operation logging feature in a Spring Boot application using custom annotations and Spring AOP, covering requirement analysis, pitfalls of a naïve implementation, AOP design, code examples, and testing procedures.
Tencent has donated its high‑performance OpenKona JDK to the Open Source China foundation, offering the full source code, build infrastructure and national‑cryptography support, and already powers over a million servers across more than 120 companies, promising a domestic alternative for Java development in big‑data, AI and cloud scenarios.
This guide introduces MinIO as an S3‑compatible object storage service and walks through its installation, Maven dependencies, Spring Boot configuration, Java client setup, REST controller implementation for file upload, preview, download, and deletion, and includes debugging screenshots.
This article explains how to design and implement a business operation logging feature in a Java Spring Boot application using AOP, covering requirement analysis, a flawed manual approach, the AOP‑based solution with custom annotations, code examples, testing tips, and a concise summary of the benefits.
This guide explains what a scaffolding tool is, why it’s essential for micro‑service development, and provides step‑by‑step instructions for creating, publishing, and using a Maven archetype scaffold with Spring Boot, including Maven configuration, version handling, and repository deployment.
Learning Go offers PHP developers faster execution, superior concurrency, and a built‑in web server, making it easier to build high‑performance applications, and this article demonstrates these advantages with simple code examples while also providing resources for further study.
The Sixth ByteDance Training Camp offers free frontend and backend technical training for university students, featuring project-based learning, expert instructors, and career development opportunities to enhance their technical skills and professional competitiveness.
This article explains how rapid business growth leads to dead Java code, defines unused code at the method level, compares runtime and full‑method collection techniques, describes the algorithm for deriving not‑executed methods, and outlines an architecture that combines ServiceAbility Agent and java‑all‑call‑graph for systematic code slimming.
This article explains how Spring Boot 3.0.5 processes errors, registers a default /error page, and returns either HTML or JSON responses based on the Accept header, detailing the underlying servlet and Tomcat mechanisms with code examples.
The article explains Docker's advantages for local development, details common installation issues such as WSL2 kernel updates and BIOS virtualization settings, and walks through setting up Docker Desktop, running a sample Nginx container, and addressing further challenges in container‑based workflows.
This article explains service performance concepts and presents systematic code‑level and architectural optimizations for Java back‑ends, covering class preloading, thread‑pool usage, static variables, cache‑line alignment, false sharing mitigation, branch prediction, copy‑on‑write, method inlining, reflection caching, exception handling, logging practices, lock granularity, and pooling strategies, all illustrated with concrete code examples.
This article introduces a comprehensive open-source Hospital Information System (HIS) project built with Spring Cloud and Spring Boot 2.x, detailing its functional modules, architecture diagram, backend and frontend technology stacks, deployment plans, and the public repository link.
This article explains the concepts of rule engines versus imperative programming, demonstrates rule‑engine implementation with EasyRules through code examples, discusses its business value and application in ZuanZuan Wallet, and analyzes the performance of EasyRules in rule evaluation and execution.
