This article explains how to replace the default embedded Tomcat container in Spring Boot with Undertow, compares their performance and memory usage through load tests, and demonstrates why Undertow is a better choice for high‑concurrency Java web applications.
Learn how to enable IntelliJ IDEA’s built‑in Docker plugin, configure remote Docker connections, manage images and containers, build Dockerfiles for a SpringBoot project, and deploy the application using Docker Compose, all without leaving the IDE.
Learn how to configure Spring Boot 2.7.16 for unified API prefixes, custom static resource locations, annotation‑based and custom parameter validation, global exception handling, request inspection via HttpEntity, CORS filtering, custom error pages, and reliable ServletContext access using ApplicationListener.
This article provides an in‑depth tutorial on Alibaba Sentinel, covering its core concepts, installation of the dashboard, integration with Spring Cloud microservices, detailed configuration of flow control, degrade rules, hot‑parameter limiting, system adaptive protection, custom block handlers, persistence with Nacos, and cluster flow control for high‑availability services.
This tutorial demonstrates how to build a custom dynamic data source solution in Spring Boot by combining ThreadLocal and AbstractRoutingDataSource, covering the implementation of context holders, routing logic, configuration, testing, annotation‑driven switching, and runtime addition of new data sources.
This tutorial demonstrates how to set up a SpringBoot Java service, expose its API through cpolar's internet‑penetration tunnel, configure a fixed sub‑domain, and use the cpolar listener to monitor and replay requests, providing a complete workflow for backend developers.
This guide explains how to create and configure Spring Boot's RestClient, covering instance creation, request building, header and body handling, response retrieval, error processing, the exchange method, and available client request factories for robust synchronous HTTP communication.
This article demonstrates how to wrap EasyExcel within a Spring Boot + MyBatis‑Plus project to provide clean, reusable import and export APIs, covering environment setup, annotation usage, controller implementation, core service design, common pitfalls, and solutions for date and template handling.
The article announces a Chinese patent (CN112905176B) for a SpringBoot‑based backend implementation method, outlines its technical steps and benefits, briefly introduces SpringBoot, and also includes promotional material for a ChatGPT‑focused community offering resources and exclusive offers.
This article provides a step‑by‑step tutorial on integrating the Apollo configuration center into SpringBoot applications, covering basic concepts, client design, environment, cluster and namespace management, Maven setup, Docker image creation, and deployment on Kubernetes for dynamic configuration updates.
This article walks through the challenges of sharing a single database across pre‑release, gray, and online environments, explains how to add an env field for isolation, and shows a custom MyBatis interceptor and annotation‑driven AOP solution that rewrites SQL to automatically handle environment filtering and insertion while keeping business code untouched.
This article walks through the design and implementation of a three‑tier instant‑messaging platform—including a Netty‑based chat server, a JavaFX client, and a SpringBoot web admin console—covering architecture, protocol design, database schema, key Netty handlers, threading, and authentication details.
Discover how the low‑code Java framework Erupt enables rapid creation of full‑stack admin applications without writing front‑end code, by using annotations to generate CRUD pages, integrating with SpringBoot, configuring dependencies, and extending with modules for scheduling, code generation, monitoring, NoSQL, and magic‑API.
This article presents a step‑by‑step technical walkthrough of a SpringBoot‑based Seckill project, covering password MD5 hashing, distributed session management, unified exception handling, page and object caching, static page generation, memory flag with Redis pre‑decrement and RabbitMQ async processing, oversell prevention, and API rate limiting, followed by a visual demonstration of the system’s UI and source code download.
This article explains pagination rationalization in SpringBoot using MyBatis PageHelper, illustrates common unreasonable pagination scenarios, demonstrates a bug caused by page deletion, and shows how a simple two‑line configuration or per‑query setting resolves the issue while detailing the underlying implementation.
This article explains how MyBatis implements first‑level (session) and second‑level (namespace) caches, details their activation conditions, common pitfalls—especially when integrated with SpringBoot—and provides step‑by‑step configuration, code examples, and best‑practice recommendations to ensure cache effectiveness while avoiding hidden hazards.
This article walks through an interview question about the maximum concurrent requests a default SpringBoot application can process, builds a minimal demo, examines Tomcat and Undertow thread‑pool configurations, and shows how container defaults and parameters like core size, max size, and queue length determine the real limit.
This guide walks through XXL‑JOB’s core features, shows how to download and set up the admin console, configure a SpringBoot executor, and implement various job types—including simple, sharding, command‑line, HTTP, and lifecycle tasks—complete with code samples and UI screenshots.
This guide shows how to configure Spring Boot, MyBatis‑Plus and the dynamic‑datasource starter to connect to MySQL, SQL Server and PostgreSQL, add and remove data sources at runtime, verify their availability, and perform manual switching using a utility class and functional interfaces.
This article walks through setting up a SpringBoot project with the Modbus4j library to communicate with Modbus TCP devices, covering repository configuration, Maven dependencies, utility class implementation, single and batch reads, scheduled tasks, and troubleshooting common function‑code errors.
This tutorial demonstrates how to configure a SpringBoot application to repeatedly call a third‑party HTTP API, parse the returned JSON with FastJSON, and process each data item concurrently using a fixed thread pool initialized in a scheduled task.
This article explains the concepts behind SpringBoot Starters, walks through the creation of a custom starter that provides global request/response encryption and decryption using SM2, shows the project structure, key configuration files, core code, testing steps, and subsequent optimizations.
Industrial and Commercial Bank of China received patent CN112905176B for a SpringBoot‑based web system backend method that extracts operation data, maps business IDs to configuration, builds conditional expressions, and processes data, thereby reducing development changes, cutting costs, and enhancing system stability.
This article explains four audit implementation approaches, provides the SQL schema for the audit and file tables, shows complete SpringBoot controller code for handling audit operations and file uploads, and presents full Vue front‑end code for creating, editing, listing, and approving audit records, offering a comprehensive guide for backend developers.
This tutorial explains how to use Spring Retry in a SpringBoot 2.7 application, covering both annotation‑based @Retryable usage and programmatic RetryTemplate configuration, with complete code examples, listener implementation, and execution results.
This article provides a step‑by‑step guide on integrating the lightweight distributed task scheduler XXL‑JOB into a SpringBoot application, covering prerequisite installations, Maven dependency configuration, property settings, JobHandler implementation, and registration to enable scalable and reliable job execution.
This article introduces Easy-Es, an ORM framework built on Elasticsearch's RestHighLevelClient, explains its architecture and advantages, and provides step‑by‑step instructions—including Maven/Gradle setup, configuration, entity and mapper creation, and full CRUD test examples—so developers can quickly integrate powerful search capabilities into Spring Boot applications.
This guide explains Redis's three clustering modes—master‑slave, Sentinel, and Cluster—detailing their architectures, failover mechanisms, PSYNC replication, configuration files, Spring Boot integration, and step‑by‑step testing to achieve high availability and scalability.
This article provides a step‑by‑step guide on designing and implementing an audit feature using SpringBoot for the backend, MySQL for data storage, and Vue.js for the front‑end, covering multiple implementation strategies, database schema creation, RESTful APIs, file upload handling, and UI interaction details.
This article provides a step‑by‑step guide on designing and implementing an audit workflow in a SpringBoot application, covering database schema creation, multiple backend implementation strategies, RESTful controller code, Vue.js front‑end integration, and file upload handling with deduplication.
This article explains the concept of open APIs and signature verification, outlines the end‑to‑end signing and verification flow, and provides complete Spring Boot code—including configuration properties, a signature manager, custom annotation, AOP aspect, request‑caching filter, and utility class—to securely validate third‑party requests without exposing credentials.
This article provides a comprehensive analysis of SpringBoot's run method, explaining its overall flow, the creation of SpringApplication objects, argument parsing, environment preparation, context refresh, and key extension points, while offering code examples to help developers understand the startup process.
This article investigates why a SpringBoot service takes 6‑7 minutes to start, identifies the heavy cost of component scanning and bean post‑processing, demonstrates how to monitor each phase with custom SpringApplicationRunListener and BeanPostProcessor implementations, and presents practical JavaConfig and starter‑based solutions that cut startup time from minutes to seconds.
This article explains how to build a robust, thread‑safe local cache for Spring Boot applications by defining cache domain models, abstract managers, a centralized registry, and scheduled refresh tasks, while providing complete Java code examples and best‑practice recommendations.
This article provides a comprehensive guide to Ctrip’s open‑source Apollo configuration center, covering its core concepts, features, architecture, deployment dimensions, client design, code examples for a SpringBoot project, testing procedures, and Kubernetes deployment with Docker.
This article explains why upgrading from JDK8 or JDK11 to the long‑term support JDK17 brings significant garbage‑collector performance improvements, new language features, and better framework compatibility, and provides detailed migration steps, Maven and SpringBoot configuration changes, and troubleshooting tips.
This article demonstrates how to store, create, update, and delete scheduled tasks in a SpringBoot application by leveraging ThreadPoolTaskScheduler, covering task configuration, utility classes, Cron expressions, and practical testing with full code examples.
This guide explains how to implement API rate limiting in SpringBoot 2.7.16 using custom annotations, AspectJ, and the high‑performance Caffeine cache, covering cache configuration, eviction policies, statistics, and practical code examples for annotation definition, aspect logic, and controller usage.
This tutorial explains how to switch between multiple databases in a Spring Boot application by implementing ThreadLocal and AbstractRoutingDataSource, covering code implementation, configuration, testing, annotation-based switching, and dynamic addition of data sources with detailed examples and practical guidance.
This article explains how to combine Domain‑Driven Design's four‑layer architecture with a microservice‑oriented application SDK, introduces the D3boot lightweight framework and its modular base components, and shows how the approach simplifies building SaaS and PaaS systems while keeping code reusable and maintainable.
This article explains Spring and SpringBoot’s key extension points—including BeanPostProcessor, BeanFactoryPostProcessor, ApplicationContextInitializer, EnvironmentPostProcessor, and PropertySourceLocator—provides detailed code examples, registration steps, and trigger timing to help developers customize and extend Spring applications effectively.
This guide explains how to protect a SpringBoot-based e‑commerce project from source leakage by using code obfuscation or the ClassFinal Maven plugin, detailing configuration, startup options, decompilation results, and machine‑binding to ensure the packaged jar runs only on authorized servers.
This article explains Spring's seven transaction propagation modes, how they affect nested @Transactional method calls, and the resulting commit or rollback behavior in various scenarios, providing clear examples and diagrams for each propagation type.
This article explains why a SpringBoot 3.0.9 application creates duplicate user rows when sending confirmation emails, analyzes the transactional behavior causing the issue, and presents three solutions—including pessimistic locking, narrowing transaction scope, and an event‑driven approach—to ensure data consistency.
This article introduces PowerJob, explains its key features such as lock‑free scheduling, multiple execution modes, and workflow support, and provides step‑by‑step instructions for installing via Docker or JAR, configuring databases, setting up server and client projects, and creating and managing scheduled tasks in Java.
This article explains the concept of idempotency, why it matters for HTTP APIs, the impact on system design, RESTful method characteristics, and compares four practical implementation strategies—including database primary keys, optimistic locking, Redis token, and downstream sequence numbers—followed by a complete SpringBoot example with code and tests.
This article walks through implementing dynamic data‑source switching in SpringBoot by combining ThreadLocal with AbstractRoutingDataSource, covering manual code, configuration, annotation‑driven AOP, and runtime addition of new data sources, complete with test cases and sample code.
This article provides an in‑depth tutorial on Apollo, Ctrip's open‑source distributed configuration center, covering its concepts, architecture, four management dimensions, client design, deployment in Kubernetes, and step‑by‑step Spring Boot integration with code examples and configuration details.
This article introduces a lightweight, open‑source SMS platform built with SpringBoot and Vue, explains its server‑side architecture, provides step‑by‑step deployment instructions, and demonstrates how to send templated messages using a simple Java SDK.
This article explains how to design and implement a token generation, storage, and verification system for both PC and mobile clients in a distributed microservice architecture, using Spring Boot, Redis, custom annotations, AOP aspects, and Vue front‑end integration.
This article introduces SpringBoot 3.2's JdbcClient, explains how to add the dependency, inject it, and demonstrates fluent‑API query and insert operations—including positional, named, map‑based parameters and custom RowMapper—showing how to perform CRUD without heavyweight ORM frameworks.
This article explains the concept, advantages, and implementation methods of Single Sign‑On (SSO) and provides two complete hands‑on examples—including architecture diagrams, database schema, configuration, and Java code for token‑based, ticket‑based, and RSA/AES encrypted SSO flows—using SpringBoot, Vue and Uni‑App.
This article introduces a SpringBoot‑based code generation tool that automatically creates entity classes, DAO interfaces, service implementations, and controller code from database tables, explains its design principles, demonstrates usage with screenshots, and provides a comprehensive set of customizable templates and dynamic parameters for developers.
This article explains how to diagnose and dramatically reduce SpringBoot service startup latency by examining SpringApplicationRunListener phases, Bean scanning overhead, BeanPostProcessor timing, and cache auto‑configuration, then applying JavaConfig and starter‑based solutions to cut startup from minutes to seconds.
This article explains how to dynamically modify Cron expressions for scheduled tasks in SpringBoot applications, covering @EnableScheduling, @Scheduled, mutable and immutable task configurations, custom interfaces, and code examples for registering, refreshing, and managing tasks at runtime without external schedulers.
This tutorial explains three approaches to sending email in Spring Boot—JavaMailSender, JavaMail API, and Apache Commons Email—compares their advantages and disadvantages, and provides complete Maven dependencies, configuration settings, and ready‑to‑run code examples for each method.
This article introduces Spring Boot 3.2's new JdbcClient, explains its fluent API style, shows how to add the dependency, inject it, and perform various query and insert operations with code examples, highlighting its advantages over traditional ORM frameworks.
This article explains how to build a high‑performance, million‑row Excel export feature in Java using SpringBoot, EasyExcel, asynchronous job or MQ processing, pagination, multi‑sheet handling, OSS storage, and WebSocket notifications to avoid timeouts, OOM errors, and improve user experience.
This article explains how to dynamically modify Cron expressions for scheduled tasks in a SpringBoot application by using @EnableScheduling, @Scheduled, custom interfaces, and a refresh mechanism that registers, updates, or disables tasks at runtime without additional middleware.
This article explains how to enable and use the OpenJDK CRaC project with SpringBoot 3.2, covering prerequisites, dependency setup, automatic and manual checkpoint creation, and demonstrates significant startup‑time reductions through detailed examples and performance results.
This article benchmarks the cost of instantiating a new ObjectMapper for each JSON conversion in a SpringBoot project, demonstrates a singleton implementation that boosts read performance by 18× and write performance by up to 300×, and shows how to add custom serializers without sacrificing speed.
This article walks through the complete design and implementation of a permission module for the Mall e‑commerce project, covering functional design, database schema, API specifications, and key technical choices such as Spring Security, JWT, and Redis‑based AOP optimization.
This article explains the core concepts, architecture, and implementation details of the lightweight distributed scheduling platform Xxl-Job, including its scheduler center, executor, job handlers, registration, task triggering, routing strategies, execution flow, and result callbacks, with a step‑by‑step demo and code examples.
This guide explains how to implement dynamic data source switching in SpringBoot by leveraging ThreadLocal and AbstractRoutingDataSource, covering basic concepts, code examples for context holder, routing datasource, configuration, annotation‑driven switching, and runtime addition of new data sources with practical testing steps.
This article provides a comprehensive overview of the Caffeine local cache library, covering its fundamentals, configuration options, loading strategies, eviction policies, statistics, and detailed steps for integrating Caffeine with Spring Boot using annotations and custom cache managers.
This guide walks through migrating services from Alibaba Cloud to AWS by containerizing Tomcat and SpringBoot applications with Docker, covering environment checks, Dockerfile creation, image building, container deployment, troubleshooting, and best‑practice summaries for reliable production rollout.
This article demonstrates how to build a real-time equipment monitoring solution by using WebSocket for server‑client communication, a Vue.js front‑end to display device status on a map, and a SpringBoot back‑end that broadcasts abnormal alerts to connected browsers.
This tutorial shows how to build a lightweight request‑tracing solution in SpringBoot 3.2 using SLF4J, MDC, custom filters, logback configuration, and a global ResponseBodyAdvice to log and return trace IDs for improved debugging and observability.
This article explains why upgrading to JDK 17 is essential, outlines the long‑term support, performance gains from modern garbage collectors like ZGC, new language features such as switch expressions and records, and provides detailed migration steps, Maven and Spring Boot configuration, and troubleshooting tips for a smooth transition.
This article presents a concise tutorial on building a flash‑sale (Seckill) system with SpringBoot, MySQL, Redis, RabbitMQ and a basic HTML/JQuery front‑end, covering architecture, key features, code snippets, over‑selling prevention, rate limiting, and deployment screenshots.
This article demonstrates how to build a real‑time equipment monitoring application by using WebSocket for server‑client communication, a Vue.js front‑end to display device status, and a SpringBoot back‑end that broadcasts alerts when abnormal devices are reported.
This article explains how to use Redis BitMap to build an efficient sign‑in feature and monthly statistics in a Spring Boot microservice, covering basic BitMap commands, key design, code implementation, testing procedures, and a cache‑penetration mitigation strategy.
The article walks through a DDD‑inspired four‑layer microservice architecture, explains how an application SDK enables RPC communication across services, details each architectural layer, and showcases the open‑source D3boot framework that bundles reusable base components, BOM management, and SaaS‑ready features for rapid backend development.
This article explains how to design microservice permission control using Apache Shiro, sharing session data via Redis, outlines failed approaches, presents a workable solution with custom cache and session managers, and provides complete code examples for realms, configuration, and login flow.
This article analyzes the overselling problem that occurs during high‑concurrency flash‑sale (seckill) operations and presents seven concrete solutions—including improved lock placement, AOP‑based locking, three types of database locks, optimistic locking, a blocking‑queue approach, and a Disruptor queue—complete with SpringBoot 2.5.7 code samples, performance test results, and practical recommendations.
This article demonstrates how to build a real‑time equipment‑monitoring solution by using WebSocket for server‑to‑client push, with a SpringBoot backend that handles WebSocket connections and a Vue.js front‑end that visualizes device status and updates instantly when an abnormal event is reported.
This article explains how to build a Spring Boot‑based service registry that replicates Nacos' core features—service discovery, health‑checking, and dynamic configuration management—by creating server‑side registration APIs, scheduled heartbeat checks, client registration logic, and database‑backed configuration storage.
This tutorial explains how to build a real‑time fire‑equipment monitoring application where a Vue.js front‑end receives abnormal event notifications via WebSocket from a SpringBoot back‑end that broadcasts device status changes instantly.
This article examines the benefits of moving from JDK 11 to the long‑term support JDK 17, detailing performance gains—especially sub‑millisecond ZGC pause times—new language features, compatibility considerations, benchmark results, and step‑by‑step migration instructions for Spring‑based applications.
This article details the design and implementation of a Java‑based flash‑sale (Seckill) system using SpringBoot, Redis, RabbitMQ, and related technologies, covering architecture, security, caching, asynchronous processing, oversell prevention, and rate‑limiting techniques.
This article introduces the open‑source mall project—a SpringBoot + Vue + uni‑app e‑commerce platform with over 60 K GitHub stars—detailing its payment flow, architecture, tech stack, video tutorial series, and how to join the learning community for hands‑on development experience.
This guide explains how Java applications can send SMS messages efficiently by comparing client‑side SDK integration with a dedicated server‑side SMS platform, covering provider choices, code examples, multi‑channel aggregation with SMS4J, and design considerations for high‑availability messaging.
This article walks through the design and implementation of a Java SpringBoot‑based electronic signature and seal system, covering the underlying concepts of digital signatures, the complete project structure, key controller and service code, utility classes, deployment steps, and a step‑by‑step functional demo with screenshots.
This article introduces TLog, a zero‑intrusion Java logging library that adds globally unique trace IDs, SpanId and upstream/downstream tags to microservice logs, outlines its key features, multiple integration modes, configuration examples for Log4j and async logging, and shows how to use it with Spring Boot, Spring Native and task frameworks like XXL‑JOB.
The article walks through diagnosing a 10‑second backend loading delay, explains connection‑pool concepts, introduces Alibaba's Druid pool with its monitoring UI, shows how to identify and optimize slow SQL queries using DISTINCT and indexes, and provides step‑by‑step SpringBoot integration instructions.
Learn how to implement both simple parameter checks and complex business rule validations in SpringBoot by leveraging Bean Validation, creating custom annotations like @UniqueUser and @NotConflictUser, and integrating them seamlessly into controllers to ensure data integrity and reduce boilerplate logic.
This article explores how many concurrent requests a SpringBoot application can process with default settings, demonstrating a hands‑on demo, analyzing Tomcat’s thread‑pool defaults, comparing Undertow behavior, and revealing how configuration parameters like core threads, max threads, queue size, and connection limits affect throughput.
This article examines the pitfalls of using SpringBoot's @ControllerAdvice and @ExceptionHandler for global exception handling, illustrates common issues across controller, service, and data layers, and proposes more precise logging and debugging strategies to improve error traceability and maintainability.
The article explains why multiple independent systems hurt user experience, reviews traditional session and cookie based authentication, discusses session sharing problems in clustered environments, and presents centralized Redis storage and CAS‑based single sign‑on solutions with code examples and a comparison to OAuth2.
This article explains SpringBoot’s auto‑configuration mechanism, walks through the DispatcherServlet example, and demonstrates how to build a custom logging starter—including annotation, properties class, AOP aspect, auto‑configuration class, Maven packaging, and usage—showcasing the efficiency and reusability benefits for backend developers.
This guide shows how to free up hundreds of gigabytes on a Windows PC by locating and deleting large JetBrains IDE directories, customizing IDE configuration and cache paths, and also introduces the popular open‑source SpringBoot‑based e‑commerce project “mall” for further learning.
This article demonstrates how to invoke external services from a Spring Boot application by using raw HttpClient, the RestTemplate utility, and Feign client, providing complete code examples, configuration steps, and tips for handling headers and tokens.
This guide introduces Spring WebClient, a reactive, non‑blocking HTTP client for Spring Boot, compares it with RestTemplate, explains configuration options, demonstrates usage patterns, error handling, memory limits, Reactor Netty customization, request bodies, form data, and filter registration, providing practical code examples throughout.
This article investigates why a SpringBoot service takes 6‑7 minutes to start, identifies the bean‑scanning and bean‑initialization phases as the main performance culprits, and presents concrete JavaConfig and starter‑based solutions to reduce startup time to around 40 seconds while handling cache auto‑configuration pitfalls.
This article introduces DynamicTp, a Java framework that extends ThreadPoolExecutor with dynamic configuration, real‑time monitoring, and alerting, enabling developers to adjust thread‑pool parameters on the fly, integrate with popular configuration centers, and achieve high‑availability and scalability in microservice environments.
This article details a practical approach to handling massive billing data by dynamically creating monthly tables in MySQL via stored procedures, integrating them with a SpringBoot‑MyBatis backend, and providing APIs for insertion, serial‑number lookup, and time‑range queries, complete with code examples and operational tips.
This article introduces a simplified Seckill (flash‑sale) system built with SpringBoot, detailing its overall architecture, key backend techniques such as distributed sessions, Redis caching, RabbitMQ asynchronous ordering, security measures, oversell prevention, rate limiting, and provides essential code snippets and deployment screenshots.
Learn how to install and configure PowerJob, a next‑generation distributed scheduling and computation framework, by setting up MySQL and MongoDB, deploying the server and worker via Docker, adding Maven dependencies, defining processors, and managing tasks through its web UI for reliable microservice job orchestration.
This article details the design and implementation of a Java-based Seckill (flash‑sale) platform built with SpringBoot, MySQL, Redis, RabbitMQ, and front‑end technologies, covering password hashing, distributed sessions, caching strategies, asynchronous order processing, oversell prevention, rate limiting, and provides code snippets and deployment screenshots.
This article provides a comprehensive guide to Caffeine, a high‑performance Java local cache library, covering its fundamentals, loading strategies, eviction policies, refresh mechanisms, statistics, and step‑by‑step integration with Spring Boot using annotations such as @Cacheable and configuration examples.
