This article introduces JetLinks, an open‑source, enterprise‑grade IoT platform built on a reactive Java stack, outlines its rich features and architecture, and provides step‑by‑step Docker and non‑Docker deployment instructions so developers can quickly launch and explore the system.
This article provides a detailed walkthrough of MyBatis‑Plus internals, covering the auto‑configuration of SqlSessionFactory, parsing of mapper XML and annotations, registration of mapper interfaces via @MapperScan, creation of dynamic proxies, and the final assembly of executable SQL scripts for database interactions.
This article explains how to add a universal app‑key whitelist authentication feature to a Spring‑Boot web framework by using four different mechanisms—traditional AOP, HandlerInterceptor, custom HandlerMethodArgumentResolver, and a Servlet Filter—while comparing their execution order and extensibility.
This article explains how to translate complex Domain‑Driven Design concepts into concrete code structures, covering domain objects, application services, infrastructure, and context integration, and demonstrates the approach with a ticket‑service case study using Spring Boot and Spring Cloud Stream.
This article explains multiple ways to achieve asynchronous processing in Spring Boot, covering @Async annotation, CompletableFuture, WebAsyncTask, DeferredResult, Tomcat connection tuning, component scanning, Undertow migration, BufferedWriter usage, and AsyncHandlerInterceptor with detailed code examples.
This article walks through Spring Boot's default error mapping, shows how to return JSON for AJAX requests and HTML pages for browsers, and provides step‑by‑step code for creating custom exception classes, an error response entity, a Freemarker error template, and a global @ControllerAdvice handler with detailed configuration and testing examples.
This article provides a step‑by‑step tutorial on installing and configuring Spring Boot Admin, including Maven dependencies, server and client setup, YML properties, security, Nacos registration, email notifications, custom health indicators, and Micrometer metrics to monitor Spring Boot services.
This article explains why Spring Boot was created, outlines its key features such as convention over configuration and automatic wiring, dives into the inner workings of annotations like @EnableAutoConfiguration, demonstrates how SpringFactoriesLoader implements SPI, and guides you through building a simple starter component step by step.
This article provides a comprehensive, step‑by‑step tutorial on Apollo—Ctrip's open‑source distributed configuration center—including its core concepts, features, four‑dimensional model, client design, high‑availability considerations, and detailed instructions for creating a Spring Boot demo project, configuring Maven and YAML files, writing controller and startup classes, setting JVM parameters, testing dynamic updates, exploring clusters and namespaces, and finally containerizing and deploying the application on Kubernetes.
This article demonstrates practical techniques for data masking, covering MySQL string functions for phone and ID masking, a Java library for various sensitive fields, and a MyBatis‑Mate extension that applies custom and built‑in masking strategies through annotations and REST endpoints.
This article demonstrates how to mask sensitive phone numbers and ID cards directly in MySQL, introduces a Java masking library, and provides a complete MyBatis‑Mate extension with custom strategies, configuration files, and sample Spring Boot code to protect personal data in applications.
Discover how to integrate the lightweight, high-performance Cache2k library into Spring Boot 2.7, explore benchmark results that surpass Ehcache3 and Caffeine, and learn basic and advanced configuration techniques—including custom builder settings and Micrometer metrics—for optimal in-memory caching.
This tutorial explains how to configure Spring Boot with a single DataSource, integrate MyBatis, and extend the setup to a dynamic multi‑DataSource using AbstractRoutingDataSource, custom annotations, and AOP, covering connection pool setup, property mapping, and transaction management.
Learn how to secure a Spring Boot service by limiting request frequency per IP and URL using a custom interceptor combined with Redis distributed locks, automatically blocking abusive IPs after a configurable number of hits within a set time window.
This guide explains how the Leaf distributed ID service, built with Spring Boot, supports segment and Snowflake modes, details its configuration, deployment steps, code examples, and operational considerations for high‑throughput backend systems.
Spring Security OAuth has reached end‑of‑life, with its documentation removed and code moved to a read‑only Spring attic repository; this guide explains how to detect deprecated dependencies, replace them with Spring Security 5.7’s OAuth2 Client, Resource Server, and the new Spring Authorization Server, ensuring a smooth migration to modern, supported authentication solutions.
This article introduces an open‑source distributed file system built with Spring Boot and Vue CLI, detailing its MIT licensing, UI layout, file operations, multiple upload methods, online preview and editing capabilities, storage options, and the underlying backend and frontend technologies.
This article explains how to deploy a CAS server, configure the cas-client dependency, set up Spring Boot annotations and cookie handling, share sessions across multiple services, and resolve cross‑origin and authentication redirects for a Vue front‑end separated from legacy JSP back‑ends.
This tutorial demonstrates how to set up Elasticsearch 7.6 with the IK analyzer, import Spring Data Elasticsearch dependencies, configure connection beans, define entity and repository classes, and implement CRUD, pagination, and highlighted search operations in a Spring Boot application.
The article investigates why a Spring Boot application using Nacos as a configuration center does not inject bean properties defined locally when the Nacos console lacks those entries, by walking through the integration steps and analyzing the relevant source code.
This tutorial walks through creating a basic leave‑approval process using the Flowable BPMN engine in a Spring Boot project, covering project setup, BPMN diagram design, XML definition, and Java code for deploying, visualizing, and handling task approvals and rejections.
This article demonstrates how to protect a Spring Boot service from malicious requests by creating a custom interceptor that tracks URL‑IP request counts, uses Redis for distributed locking, and disables offending IPs after a configurable threshold, with full code examples and configuration steps.
This article explains the various ways to execute code during a Spring Boot application's startup, comparing Java static blocks, constructors, @PostConstruct methods, and Spring's ApplicationRunner and CommandLineRunner interfaces, including ordering with @Order and providing sample code and execution results.
This guide walks you through upgrading to Spring Boot 2.7.0 and Spring Security 5.7.1, showing the deprecated WebSecurityConfigurerAdapter removal, the new SecurityFilterChain approach, and advanced dynamic permission techniques with complete code examples.
This tutorial demonstrates how to set up Elasticsearch 7.6 with the IK analyzer in a Spring Boot 2.3 project, import the appropriate Spring Data Elasticsearch dependency, configure the client, define indexed entity classes, create repository interfaces, and implement REST controllers for CRUD, pagination, and highlighted search queries, complete with code examples and test results.
This article provides a comprehensive tutorial on implementing Single Sign‑On using the open‑source CAS solution, covering the concepts of SSO and CAS, required development environment, server‑side deployment, client integration with Spring Boot, configuration details, and a complete end‑to‑end testing workflow.
This article explains the role of the spring.factories file in Spring Boot starters, shows its typical content, and demonstrates how to automatically generate the spring-configuration-metadata.json file by adding the configuration processor dependency and properly annotating configuration property classes.
Spring Boot 2.7.0 introduces major enhancements such as a new @AutoConfiguration annotation, upgraded Flyway modules, H2 2.1 support, GraphQL starter, Podman integration, Cache2k auto‑configuration, and several deprecations and test annotation improvements, providing a comprehensive update for Java backend developers.
This guide demonstrates how to integrate RocketMQ with Spring Boot, covering dependency setup, configuration, and two message‑filtering techniques—tag‑based and SQL‑92 expression filtering—complete with consumer and producer code examples, testing endpoints, and visual diagrams illustrating each approach.
Spring Authorization Server 0.3.0 has been officially released, bringing updated documentation, major feature changes such as token customizer relocation, removal of deprecated APIs, dependency upgrades to Spring Boot 2.7.0 and Spring Security 5.7.1, and new contributors, with detailed module overviews and changelog links.
The article explains how to handle multi‑table updates in a Spring Boot backend by replacing synchronous single‑threaded execution with three asynchronous strategies—using a ThreadPoolExecutor, Spring's @EnableAsync/@Async annotations, and a message‑queue decoupling—to improve response time and system stability.
After upgrading to Spring Boot 2.6, a NullPointerException occurs when integrating Swagger due to the new PathPatternParser, and the issue can be resolved by changing the path‑matching strategy to ant_path_matcher or adding a custom WebMvcEndpointHandlerMapping bean.
This article presents sixteen practical best‑practice recommendations for developing Spring Boot microservices, covering dependency management, auto‑configuration, project initialization, code organization, service design, database isolation, concurrency, configuration externalization, exception handling, logging, testing, and more, to help Java backend engineers build robust, maintainable applications.
This article introduces the mica-auto open‑source tool that uses Java annotation processing to automatically generate Spring Boot configuration files like spring.factories and AutoConfiguration.imports, and provides step‑by‑step instructions for integrating it into a Maven project.
This article explains how to create a Java‑based hot‑search system using Redis ZSets, record and manage personal search histories, retrieve the top ten queries, and integrate a DFA‑driven sensitive‑word filter within a Spring Boot application, complete with full code examples.
This guide explains the principles of API idempotency using unique business IDs or token mechanisms, explores distributed rate‑limiting dimensions, compares token‑bucket and leaky‑bucket algorithms, and provides concrete implementations with Guava RateLimiter, Nginx configuration, and a Redis‑Lua script integrated into Spring Boot, including annotation‑based AOP for easy usage.
This guide explains why Spring Boot deprecates the META-INF/spring.factories file, how the change affects custom starters, and provides step‑by‑step code examples for migrating to the new AutoConfiguration.imports mechanism.
Spring Boot 2.7 marks the spring.factories auto‑configuration loading method as deprecated, and Spring Boot 3 will remove it entirely, prompting developers to adopt the new AutoConfiguration.imports mechanism, which supports configuration slicing, custom SPI extensions, and more elegant handling via tools like mica‑auto.
This article shares sixteen practical Spring Boot best practices—from managing dependencies with custom BOMs and leveraging auto‑configuration to structuring code, handling exceptions, externalizing configuration, and testing—helping developers build maintainable, scalable Java microservices efficiently.
This article explains how to integrate the Quartz job‑scheduling library into a Spring Boot application, covering core concepts, Maven dependencies, sample job and configuration code, trigger types, concurrency control, and runtime management of scheduled tasks.
The recent Spring Boot announcements introduce version 3.0.0‑M3 with Micrometer Observation support, restore REST Assured and JMS, while 2.7.0 adds GraphQL metrics, new test annotations, Podman Buildpack integration, Cache2k, simplified Jackson Mixins, PEM‑based SSL, and updates to core Spring projects, and 2.5.14/2.6.8 provide final bug‑fix releases.
This tutorial introduces MinIO, an open‑source object storage solution, explains its features and application scenarios, provides step‑by‑step Docker installation, shows how to configure it, and demonstrates integrating MinIO with Spring Boot to upload files via SDK.
This comprehensive guide walks through Spring’s fundamentals—including IoC, DI, core modules, common annotations, AOP concepts, transaction management, MVC workflow, and Spring Boot auto‑configuration—while also covering advanced topics such as bean lifecycle, circular dependencies, proxy mechanisms, and an introduction to Spring Cloud.
This article explains how to integrate Spring Boot with MyBatis, configure a single Druid data source, implement multi‑data‑source support using Spring's AbstractRoutingDataSource, create a dynamic data source with ThreadLocal, and wire everything together with custom annotations, aspects, and transaction management for backend Java applications.
This guide walks through setting up a Spring Boot 2.3.9 WebSocket server, defining message types and enums, implementing encoder/decoder, configuring the endpoint and bean, and creating a simple HTML/JavaScript client to test real‑time messaging between multiple users.
This article explains how Sharding-JDBC can perform data masking at the persistence layer, detailing key concepts, configuration of data sources, encryptors, and tables, demonstrating practical examples with built‑in MD5 and AES encryptors, and showing how to implement custom encryptors and query‑assisted encryption for enhanced security.
This article introduces LiteFlow, a lightweight, fast, and stable component‑based rule engine, explains its design principles, shows step‑by‑step usage in both non‑Spring and Spring Boot environments, and dives into the core source code that drives parsing, chain execution, and node processing.
This guide explains how to configure Maven profiles and the assembly plugin to create a zip package for a Spring Boot application, then use a reusable shell script to unzip, start, stop, and restart the service on Linux, streamlining deployment across multiple environments.
An in‑depth guide shows how to accelerate updating tens of thousands of MySQL rows in a Spring Boot‑MyBatis project by switching from automatic per‑record commits to manual transactions, applying multithreaded execution with CountDownLatch coordination, and using UNION‑based batch updates when native batch support is unavailable.
This article explains how to package a Spring Boot application using Maven profiles and the maven‑assembly‑plugin, generate a zip release, and deploy it on Linux with a reusable shell script that handles unzip, start, stop, and restart operations.
This guide explains how to set up separate configuration files for development, testing, and production in Spring Boot, modify them for each environment, and switch between environments using configuration properties, IDE settings, or command‑line arguments.
This article explains the background, design principles, architecture, serialization handling, asynchronous‑to‑synchronous conversion, trigger timing, ease of use, implementation details, and usage documentation of a lightweight, non‑intrusive JSF local debugging tool that leverages Redis publish/subscribe to enable seamless local integration testing for developers.
This guide demonstrates how to implement a simple hot‑search feature and personal search‑history management using Java and Redis, covering ZSet‑based ranking, timestamp handling, and a DFA‑based sensitive‑word filter with Spring‑Boot configuration and reusable service methods.
This article demonstrates how to efficiently update up to 50,000 MySQL records in a Spring Boot‑MyBatis application by comparing simple loops, manual transaction control, multithreaded execution with CountDownLatch coordination, and union‑based batch updates, while analyzing performance and connection‑pool considerations.
This article explains the design and implementation of a two‑level caching architecture using local Caffeine cache as L1 and remote Redis as L2 in Spring Boot, covering manual cache handling, annotation‑based management with Spring Cache, and a custom annotation with AOP to minimize code intrusion.
This article provides a comprehensive guide to Sharding-JDBC, covering the challenges of database sharding such as distributed transactions, cross‑node joins, pagination, global key collisions, and demonstrates practical configuration and code examples for vertical and horizontal partitioning using Spring Boot.
This article introduces the AJ-Captcha library, explains its sliding‑puzzle and click‑based behavior verification types, and provides a step‑by‑step guide with Maven configuration, front‑end integration code, and Spring Boot backend verification to replace traditional graphic captchas.
This article explains why Java introduced the Context ClassLoader to bypass the parent‑delegation model, demonstrates its role in SPI mechanisms such as JDBC driver loading, compares class loader behavior in Spring Boot development versus packaged execution, and highlights common pitfalls when using custom class loaders.
YouLai Mall is an open‑source full‑stack e‑commerce solution built with Spring Boot 2.4, Spring Cloud, Vue, element‑ui and uni‑app, offering microservice back‑ends, a management portal, WeChat mini‑program and mobile app, with detailed deployment instructions and source code links for rapid development.
This article introduces FastMybatis, a lightweight Java MyBatis extension that enables zero‑configuration CRUD operations across multiple databases, shows how to quickly set up a Spring Boot project with the starter, provides full code examples for entities, mappers, services, a comprehensive mapper method list, and demonstrates Query object usage for flexible data retrieval.
This guide explains how Spring Boot’s @Retryable annotation enables elegant, annotation‑driven retry logic, covering dependency setup, enabling retry, method annotation with configurable parameters, recovery handling via @Recover, and important AOP‑related considerations to avoid common pitfalls.
This article explains how to integrate WeChat QR code login using OAuth2.0 in a Spring Boot backend, covering the authorization flow, required configuration, Java code examples for obtaining the code and access token, user login handling, and AOP-based login verification.
kkFileView is a mature, open‑source Spring Boot project that provides comprehensive online preview for office, text, image, archive, multimedia, CAD and other file formats, offering both image‑based and PDF‑based rendering modes with simple REST APIs for cross‑language integration.
This guide demonstrates how to configure Maven profiles for different environments, use the Maven assembly and jar plugins to create a zip package of a Spring Boot application, and deploy and manage the service on Linux using a custom shell script called shenniu_publish.sh.
This guide introduces ip2region, an offline IP geolocation library, and shows how to integrate its Java wrapper mica‑ip2region into Spring Boot, covering dependency setup, bean injection, search methods, IpInfo fields, and provides demo screenshots and related open‑source links.
This article explains how to use Maven profiles and the maven‑assembly‑plugin to create environment‑specific Spring Boot zip packages, configure the accompanying assembly.xml, and deploy them on Linux with a custom shenniu_publish.sh script that supports unzip, start, stop and restart operations.
This article demonstrates how to build a real‑time messaging system for a space‑station scenario using RabbitMQ and Spring Boot, covering configuration of direct and fanout exchanges, scheduling updates, one‑to‑one chat, and broadcast messaging with complete Java code examples.
This article explores multiple ways to implement asynchronous processing in Spring Boot, covering @Async with @EnableAsync, CompletableFuture, DeferredResult, WebAsyncTask, AsyncHandlerInterceptor, as well as related server tweaks like increasing Tomcat connections, switching to Undertow, and using @ComponentScan for faster scanning.
This article explains how Spring Cloud automatically wraps container‑managed thread pool beans with tracing proxies to preserve distributed‑trace information, details the ExecutorBeanPostProcessor implementation, shows the relevant code for detecting and instrumenting executors, and notes when manual wrapping is required.
This tutorial explains how to integrate the Sa-Token authentication framework into a Spring Boot project, covering Maven dependencies, YAML settings, global filter configuration, permission and role retrieval, WebMvc adjustments, and testing the login and authorization flow.
This article introduces a full‑stack food‑delivery project built with Spring Boot, Vue.js, MySQL and MongoDB, detailing its architecture, module breakdown, technology choices, database setup, and step‑by‑step instructions for launching the backend API, admin portal, and mobile client, along with download links for data and images.
This article demonstrates how to deploy Flowable‑UI, design a BPMN leave‑approval process, configure a Spring Boot backend, explain Flowable database tables, and use the Flowable engine APIs with complete Java code examples to run and manage the workflow.
This article introduces Redis, explains how to install it on various platforms, demonstrates integrating Redis with Spring Boot using Spring Cache annotations, configures connection pools for Lettuce and Jedis, and provides custom Redis service implementations for flexible cache operations.
This article provides a comprehensive guide to Micrometer, covering its core metric types, MeterRegistry usage, tagging conventions, and practical code examples, and shows how to integrate it with Spring Boot, Prometheus, and Grafana for end‑to‑end application monitoring.
This article analyzes intermittent page failures caused by blocked Keycloak public‑key retrieval in a Spring Boot application, explains how default HTTP client timeouts of –1 lead to indefinite waits, and provides a filter‑based solution to set proper timeouts and adjust internal/external URLs.
This guide demonstrates how to secure Spring Boot configuration values by using Jasypt encryption and a custom EnvironmentPostProcessor with RSA, covering Maven dependencies, property setup, encrypted YAML syntax, utility classes, processor implementation, and registration via spring.factories.
This article introduces the high‑performance Disruptor library, explains its background, core concepts such as RingBuffer, Sequence, Sequencer, and WaitStrategy, and provides a complete Spring Boot‑based Java demo with code snippets illustrating producers, consumers, and configuration.
This article demonstrates how to build a simple hot‑search functionality with user search history, hot‑keyword ranking, and profanity filtering in a Spring Boot application using Java, Redis ZSet operations, and a DFA‑based sensitive‑word filter, providing complete controller and service code examples.
This article explains how to globally handle LocalDate, LocalDateTime, and LocalTime parameters in Spring Boot 2.x by creating custom Converter beans, configuring Jackson's ObjectMapper, using @DateTimeFormat, ControllerAdvice, and understanding the underlying parameter resolution mechanisms to avoid common pitfalls such as lambda‑based converter registration failures.
This article explains how to use Redis key‑expiration events in a Spring Boot application to automatically close unpaid orders by configuring Redis, adding the necessary dependencies, and implementing a listener that reacts to expired keys.
This tutorial walks you through creating a real‑time group chat using Spring Boot and Java WebSocket, covering Maven dependencies, core server classes, annotation explanations, configuration, and testing with an online client, all backed by complete source code on GitHub.
This article demonstrates how to replace verbose if‑else statements in an order‑processing system with a clean Strategy Pattern implementation, using custom annotations, a handler context, and Spring Boot components, providing complete code examples and a concise summary of the approach.
This article explains why and how to deliberately throw exceptions during Spring Boot development to test transaction rollbacks and global error handling, comparing a manual approach with IntelliJ IDEA's built‑in "Throw Exception" debugging feature.
The article presents a kindergarten management system featuring three user roles, outlines its Spring Boot and Thymeleaf technology stack, details required runtime and database environments, provides step‑by‑step deployment instructions, and includes complete backend controller source code for user, teacher, student, and school management functionalities.
Learn how to use Spring Retry’s @Retryable and @Recover annotations to implement elegant, non-intrusive retry mechanisms in Spring Boot, covering configuration, code examples, parameter meanings, backoff strategies, and important considerations for reliable error handling.
This article demonstrates how to create a reusable global exception handling mechanism for Spring Boot applications by defining a unified response class, custom business exception, error enumeration, and a @RestControllerAdvice handler, complete with code examples and testing guidance.
This article presents a comprehensive overview of designing and implementing a custom RPC framework using Spring Boot and Netty, covering concepts, architecture, service registration with Zookeeper, load balancing, custom message protocol, serialization, handling TCP fragmentation, and various client invocation modes.
This article explains how to globally configure date and time handling in Spring Boot 2.x, covering custom Converter beans for LocalDate, LocalDateTime, and LocalTime, Jackson JSON serialization settings, @InitBinder usage, and common pitfalls such as lambda expressions and parameter binding.
This guide explains why excessive try‑catch blocks hurt Spring Boot projects, introduces a unified response class, custom business exception, error enumeration, and a global @RestControllerAdvice handler, providing clean, reusable error handling with sample code and test usage.
This article explains multiple ways to implement asynchronous processing in Spring Boot, covering @Async annotation, CompletableFuture, supplyAsync, runAsync, WebAsyncTask, DeferredResult, custom interceptors, and server configuration tweaks such as Tomcat connection limits and switching to Undertow.
This tutorial walks you through setting up a complete music‑streaming web application built with Vue on the front end and Spring Boot, MyBatis, and MySQL on the back end, covering features, installation, database configuration, and launch commands.
This article explains how Spring Boot's spring-retry module and the @Retryable annotation enable clean, annotation‑driven retry logic for common failure scenarios, covering configuration, code examples, recovery handling with @Recover, and important usage precautions.
This article introduces Spring Retry's @Retryable annotation, explains its purpose, shows how to add the Maven dependency, enable retry support, annotate methods with retry settings, handle failures with @Recover, and outlines important considerations for reliable retry mechanisms in Java backend development.
This article presents sixteen practical Spring Boot best‑practice recommendations—including custom BOM management, auto‑configuration, project initialization with Spring Initializr, clean controller design, service layering, database isolation, constructor injection, logging, testing, and configuration externalization—to help developers build maintainable, high‑quality microservices efficiently.
This article describes a seat‑temporary‑leave management system built with Java Spring Boot and Vue, detailing its front‑end and back‑end modules, technology stack, functional pages, and provides a representative controller code snippet illustrating the back‑end API design.
This article explains how to implement asynchronous processing in Spring Boot using @Async annotations, JDK 8 CompletableFuture, Callable, WebAsyncTask, DeferredResult, and AsyncHandlerInterceptor, providing detailed code examples and configuration tips to improve performance and scalability of backend services.
This article provides a comprehensive tutorial on Spring Boot's auto‑configuration process, covering bean injection styles, XML and JavaConfig configurations, BeanDefinition internals, autowire modes, constructor argument handling, custom BeanFactoryPostProcessor usage, @Import mechanisms, and the inner workings of Spring Boot's EnableAutoConfiguration and its loading of META‑INF/spring.factories.
This article presents sixteen essential Spring Boot best practices—from managing dependencies with a custom BOM and leveraging auto‑configuration, to structuring packages, using constructor injection, handling concurrency, externalizing configuration, and comprehensive testing—helping developers build maintainable, high‑performance Java microservices.
This article explains how to use Spring Boot to add WebSocket support, covering the protocol basics, Maven dependencies, configuration classes, a test controller, a simple HTML client page, and troubleshooting tips, all illustrated with complete Java and JavaScript code examples.
JRebel’s 2022 Java Developer Productivity Report, based on 876 global responses, reveals that 62% plan to upgrade to the latest LTS version within a year, highlights microservice dominance, preferred tools like Spring Boot and Docker, and shows how company size influences Java 17 adoption.
