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several Java backend technologies—JSP, Struts, Hibernate, Servlet, and others—explaining why they are considered outdated or unnecessary for modern development and offering guidance on what newcomers should focus on instead.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.
This article compares MyBatis‑Plus and Bean Searcher, detailing their basic differences, dynamic query capabilities, logical grouping, multi‑table joins, performance benchmarks, supported databases, and recommended usage scenarios, while providing extensive code examples and best‑practice recommendations for backend developers.
This article explains Spring's common dependency injection methods, compares @Autowired and @Resource, outlines the pros and cons of constructor, setter, and field injection, and reveals why IntelliJ IDEA flags only @Autowired while ignoring @Resource.
This article explains Spring Boot's default JSON response, the internal HttpMessageConverter selection process, and how to configure XML and custom YAML responses by adding Jackson dependencies and implementing a custom HttpMessageConverter.
This article introduces MyBatis streaming queries, explains the Cursor interface and its methods, provides step‑by‑step code examples for configuration and implementation, discusses practical application scenarios such as large‑scale data processing, and highlights important considerations for efficient and safe usage.
This article examines synchronous versus asynchronous microservice communication, outlines the benefits of async messaging, and compares three popular message brokers—RabbitMQ, Kafka, and Redis—by evaluating their scale, persistence, consumer models, and ideal use cases to help developers choose the right solution.
The article recaps Tubi’s eighth Elixir Meetup, detailing Horvo’s presentation on building a live HLS video streaming backend with Elixir, covering the system’s transcoder, scheduler, HLS server, encryption, ad‑insertion strategies, and why Elixir was chosen for high‑performance backend services.
This article guides you through refining a classic three‑layer architecture into a domain‑driven design, structuring the project with Maven Archetype, and implementing a simple CMS with both backend (Spring Boot) and frontend (Vue) components, complete with step‑by‑step setup instructions.
This article describes how leveraging Java's ScriptEngine for dynamic JavaScript execution enables hour‑level deployment, reduces downtime, and improves flexibility by storing configurable scripts in a database, offering a practical solution for fast customer‑driven feature changes in backend systems.
This article demonstrates how to create a Python-based tool that crawls click‑event data from an e‑commerce site, processes and visualizes the information to verify event‑tracking code, covering preparation, data collection, analysis, and visualization steps with complete source code.
This document introduces a lightweight Redis graphical management tool, outlines its Spring Boot backend and Vue frontend architecture, provides step‑by‑step installation instructions including Docker deployment, details recent feature enhancements such as multi‑user support and permission control, and mentions future plans for clustering and sentinel modes.
This article introduces the core concepts of Domain‑Driven Design, demonstrates strategic and tactical modeling using a fictional "Smart Classroom" business, walks through event‑storming and four‑color modeling techniques, and provides a complete architectural and code‑level implementation guide for building a micro‑service‑based knowledge‑payment system.
This tutorial demonstrates how to create Spring Boot scheduled tasks whose execution intervals can be changed at runtime using either a configurable cron expression or a flexible periodic trigger, complete with code examples and a REST API for updating the schedule.
This article explains the design and implementation of a business operation logging feature in a Spring Boot application, contrasting flawed hard‑coded approaches with a clean AOP‑based solution, and provides full code snippets, configuration, database schema, and testing tips.
This article outlines 13 practical strategies—from mastering Java fundamentals and essential tools to documenting pitfalls, sharing knowledge, and optimizing performance—to help developers continuously improve their technical skills and become indispensable in their teams.
This article explains the OSI seven‑layer model, the differences between TCP and UDP, the three‑way handshake and four‑step termination processes, long‑living socket connections, heartbeat mechanisms, custom application‑layer protocols, and how to implement a socket connection pool using Node.js.
This article introduces the URule rule engine, compares it with other engines, explains its features, demonstrates how to install and configure it in a Spring Boot project, and provides detailed guidance on creating variable, constant, parameter, and action libraries, building rule sets, decision tables, and applying them to real‑world scenarios.
This article presents sixteen practical Spring Boot best‑practice recommendations—including custom BOM management, auto‑configuration, project initialization, code organization, dependency injection, concurrency handling, externalized configuration, logging, testing, and more—to help developers build robust, maintainable microservices efficiently.
This article explains what circular dependencies are in Spring Boot, describes the symptoms and errors introduced in recent versions, and provides multiple practical solutions—including constructor injection, @Lazy, @DependsOn, and interface segregation—along with clear code examples for each approach.
This article explains the purpose and usage of Spring Boot's four main components—Starter, Autoconfigure, CLI, and Actuator—providing Maven and YAML examples, code snippets, and practical guidance for backend developers to simplify dependency management, bean configuration, command‑line tooling, and production monitoring.
The article explains Apache's three MPMs (prefork, worker, event), how Nginx's event‑driven architecture and epoll model improve concurrency handling, and provides performance comparisons showing Nginx handling tens of thousands of connections with far lower memory usage than Apache.
This article walks through the background, core concepts, installation steps, library definitions, rule set creation, decision table usage, and a real‑world promotion scenario for integrating the URule rule engine with a Spring Boot backend, providing code snippets and visual configuration tips.
Spring Boot 3.1.0 introduces a host of enhancements—including automatic configuration for Spring Authorization Server, upgraded HttpClient support, refined Testcontainers integration, new Docker‑Compose capabilities, and updates to Hibernate, Jackson, Mockito, and SSL handling—while also providing detailed Maven and Gradle options for image building.
This article explains the Service Provider Interface (SPI) concept and compares the implementations in Java (ServiceLoader), Spring (SpringFactoriesLoader), and Dubbo (ExtensionLoader), covering their configuration files, core mechanisms, advantages, drawbacks, and typical usage scenarios.
Spring Boot 3.1.0 introduces automatic configuration for Spring Authorization Server, upgraded HttpClient 5 support, enhanced Testcontainers management, Mockito 5 integration, Docker Compose integration, SSL configuration improvements, and numerous dependency upgrades such as Hibernate 6.2 and Jackson 2.15, all aimed at simplifying modern Java backend development.
This article explains the fundamental differences between RPC and HTTP services, covering OSI model layers, RPC architecture components, synchronous vs asynchronous calls, popular RPC frameworks such as gRPC, Thrift, and Dubbo, and when to choose each approach for enterprise applications.
This article explains how to remove duplicate and redundant PHP code by applying refactoring principles such as the DRY rule, using functions and classes, adopting naming conventions, simplifying conditionals, and externalizing configuration, thereby improving readability, maintainability, and performance.
