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.
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.
This article explains three common reasons why the @Transactional annotation may not work in Spring—non‑public methods, self‑invocation, and catching exceptions—provides code examples for each case, and details the underlying proxy and transaction management mechanisms to help developers resolve the issues.
This article presents sixteen practical Spring Boot best‑practice recommendations—from managing dependencies with custom BOMs and leveraging auto‑configuration to structuring packages, handling concurrency, externalizing configuration, and adopting testing strategies—aimed at building clean, maintainable microservices.
This article explains how to define a unified JSON response format for Spring Boot APIs, implement a reusable result class with chainable methods, set up global exception handling using @ControllerAdvice, and configure Logback for structured logging across development and production environments, including code examples.
This beginner-friendly tutorial walks through creating a Spring Boot project, adding MySQL and MyBatis dependencies, configuring the application.yml file, and implementing UserMapper, User, and UserController classes to demonstrate a complete MySQL query demo.
This article explains how Hippo4j 1.1.0 introduces a configuration‑center‑driven lightweight dynamic thread pool for Spring Boot applications, covering core features, alarm strategies, web‑container updates, code examples, and migration tips.
This tutorial explains how to build a highly available, horizontally scalable distributed scheduled‑task system using Quartz in a Spring Boot application, covering application scenarios, Maven dependencies, database initialization, configuration properties, job and scheduler code, and verification of failover behavior.
This step‑by‑step guide shows how to configure JDK 1.8 and Maven 3.6.2, create a new Spring Boot project in IntelliJ IDEA using Spring Initializr, examine the generated pom.xml, add a simple HelloController, and verify that the application runs successfully.
This article shares sixteen practical Spring Boot best‑practice recommendations—ranging from custom BOM management and auto‑configuration to proper package layout, constructor injection, concurrency awareness, externalized configuration, logging, testing, and global exception handling—to help developers build clean, maintainable Java microservices.
This guide walks through converting a functional Spring Boot JAR into a Windows executable with exe4j, then bundling the EXE, JRE, and dependencies into a single installer using Inno Setup, providing step‑by‑step screenshots, configuration tips, and the final script for seamless deployment on machines without a JDK.
This guide shows how to enable hot‑deployment in Spring Boot using DevTools, simplify JavaBean code with Lombok, and add the Spring Configuration Processor for better property‑binding support, including Maven dependencies, IDE settings, and example snippets.
This step‑by‑step guide shows how to package a functional Spring Boot JAR into a Windows executable using exe4j, bundle the required JRE, and create a user‑friendly installer with Inno Setup so non‑technical users can install and run the application with a single click.
This article presents a Java Spring Boot vaccination management system that supports user registration, vaccine record handling, case history, nucleic‑acid test reporting, travel tracking, risk‑area management, and epidemic‑prevention knowledge, detailing its roles, technology stack, database design, UI screenshots, and core backend source code.
Spring Boot 3.0.0 M2, released on March 25, 2022, brings 50 bug fixes, documentation enhancements, and dependency updates, revisits the M1 changes such as Java 17 baseline and Jakarta EE migration, and adds features like restored EhCache 3 support, H2 Console, and improved @ConstructorBinding detection.
This guide explains the complete WeChat OAuth2.0 QR code login flow, from requesting the authorization code and exchanging it for an access token to configuring Spring Boot beans, handling callbacks, storing tokens securely, and enforcing login checks with Spring AOP.
After SpringFox became outdated and incompatible with Spring Boot 2.6, this article introduces SpringDoc as a modern OpenAPI 3‑based alternative, explains its advantages, shows how to integrate it, migrate annotations, configure security, and provides sample code and screenshots for a seamless transition.
This article explains how to integrate the Apache Shiro security framework into a Spring Boot application, covering core components, Maven configuration, bean definitions, custom realms, filter chains, and the complete login authentication process with code examples.
An in‑depth analysis shows that in Spring Boot 2.0.3 a @Configuration class defining a @Bean can override a @Component‑annotated bean of the same type, how the Spring container registers and replaces the bean definitions, and the evolution of bean‑overriding controls in later Spring and Spring Boot releases.
This article explains why dynamic data sources are needed in high‑traffic Spring Boot applications, shows how to configure multiple databases via Maven, YAML and Java, and demonstrates a custom annotation‑driven AOP solution for seamless runtime routing.
This article walks through upgrading a Spring Boot project to version 2.6.x, explains why circular bean dependencies and Swagger failures occur after the upgrade, and provides step‑by‑step configuration changes—including allowing circular references, using @Lazy, and adjusting MVC path‑matching—to resolve the problems.
