This tutorial walks through installing Portainer, using it to deploy a Redis master‑slave‑sentinel cluster with Docker Compose, creating a custom bridge network, testing failover, and finally integrating the sentinel setup into a Spring Boot application with Lettuce connection pooling and sample controller code.
This tutorial demonstrates how to create a custom annotation and formatter in Spring Boot 3.2.5 to automatically convert request parameters like "666,China" into a User object, covering the required interfaces, implementation, registration, and testing with code examples and screenshots.
This guide explains how Spring Boot 3.3.0 natively supports Software Bill‑of‑Materials (SBOM) generation with CycloneDX, shows Gradle and Maven configuration steps, demonstrates building an uber‑jar that includes the SBOM, and details how to expose the SBOM via Actuator endpoints and customize formats.
This article walks through six practical web‑push techniques—including short polling, long polling, iframe streaming, Server‑Sent Events, MQTT, and WebSocket—explaining their principles, trade‑offs, and providing complete Spring Boot and JavaScript code samples to help developers implement real‑time notification badges.
This article provides a detailed overview of the most commonly used Spring Boot annotations, covering core, prototype, Spring Boot, Spring Cloud, caching, testing, database access, JPA, and global exception handling annotations, with clear explanations and practical Java code examples for each.
This article explains how to use @Value and @ConfigurationProperties in Spring Boot, compares their features, and demonstrates advanced binding techniques such as constructor binding, record binding, duration and data size conversion, and validation with practical code examples.
Spring AI brings artificial‑intelligence capabilities to the Spring Boot ecosystem, offering model support, vector‑database integration, SQL‑like filtering, and easy Maven configuration, enabling Java developers to add generative AI, semantic search, and AI‑driven image generation to their backend applications.
This article explains what custom Spring Boot starters are, why they are useful, outlines the annotation and configuration file changes across Spring Boot 2.6, 2.7 and 3.x, and provides a complete AOP‑based starter implementation with code samples.
This guide explains six common Spring Boot techniques—@RequestParam, @PathVariable, @MatrixVariable, @RequestBody, @RequestHeader, and @CookieValue—for extracting URL query strings, path variables, matrix variables, request bodies, headers, and cookies, complete with code examples for each method.
This article introduces the MybatisX IDEA plugin, outlines its benefits for reducing boilerplate in MyBatis/MyBatis‑Plus projects, and provides a step‑by‑step tutorial—including database setup, Maven dependency configuration, plugin installation, connection troubleshooting, and code generation—complete with Maven and Java code examples.
This article explains how to build a reusable Spring Boot starter that automatically encrypts outgoing responses and decrypts incoming requests using hutool‑crypto, custom request wrappers, validation utilities, and Spring Boot advice components, providing a secure, zero‑boilerplate solution for Java backend services.
The article explains how a custom java.net.spi.InetAddressResolverProvider SPI that works in a regular Spring Boot 3.x JAR fails when the OpenTelemetry Java agent is added because the agent’s JarLoader cannot read the SPI configuration inside the BOOT‑INF layout, and resolves the issue by disabling the agent’s own resolver resource so the custom provider is used.
This article provides a comprehensive guide to standardizing the Spring Boot controller layer by explaining how to receive parameters, define unified status codes, apply validation annotations, wrap responses consistently, and handle exceptions globally, all illustrated with practical Java code examples.
This article introduces a Spring Boot starter that provides a ready‑to‑use Redis utility suite—including common tools, distributed locks, message queues, delay queues, pagination queries and web helpers—explains how to add the Maven dependency, configure modules via YAML, and details the internal auto‑configuration and bean implementations for MQ and delayed messaging.
This article explains the motivations for adopting message queues, outlines core concepts and protocols, compares mainstream MQ products, and provides a detailed walkthrough of Kafka architecture, cluster setup, native Java APIs, and Spring Boot integration with extensive code examples.
This guide explains how Spring Boot 3.2.5 configures logging with Logback, Java Util Logging, Log4j2 and Commons Logging, covering default formats, color output, file writing, rotation policies, log levels, grouping, shutdown hooks, custom configuration files, and Logback extensions.
This article explains the concept of graceful shutdown, outlines essential steps, examines Kubernetes pod termination and Spring Boot integration with Nacos, and provides practical optimizations—including PreStop hooks, terminationGracePeriod settings, and actuator shutdown—to ensure reliable service termination without data loss.
This guide demonstrates how to leverage Maven resource filtering for automatic property expansion in Spring Boot 3.2.5, configure externalized settings via spring.main and system properties, customize configuration file locations, activate profiles, set parent containers, modify DispatcherServlet paths, enable Tomcat access logs, MBean registry, and generate build and Git metadata.
This article explains how to design a clean, maintainable Spring Boot backend by applying core software principles, organizing modules such as core, common, business, and admin, and providing complete Maven pom examples to illustrate a modular multi‑module project layout.
This article presents a concise, beginner-friendly approach to building a Spring Boot unit testing environment using only essential Maven dependencies and test classes, covering both integration-style and pure unit test techniques, complete with annotated examples and practical testing tips.
This article explains why publicly exposed APIs are vulnerable to tampering and replay attacks, outlines anti‑tampering and anti‑replay strategies such as HTTPS, request signing, timestamp and nonce mechanisms, and provides a complete Spring Boot implementation with Redis support.
The article introduces Graceful Response, a Spring Boot component that unifies response structures, centralizes exception handling, and simplifies validation, thereby reducing boilerplate code, improving readability, and enhancing development efficiency for backend services.
This article explains how to improve a Java Spring Boot contract signing workflow by combining the Strategy pattern, Chain of Responsibility, and Composite patterns, detailing the process steps, project structure, code implementations, custom annotations, and dynamic bean injection to achieve a flexible and maintainable solution.
This article explains the principles of Redis Pipeline, compares Lettuce and Redisson client implementations in Spring Boot, presents performance tests showing dramatic speed gains over single commands, discusses practical usage scenarios, common pitfalls, and provides detailed source code examples for both clients.
This article explains two practical approaches for achieving real‑time external configuration refresh in Spring Boot 2.7, covering a custom ApplicationContextInitializer that periodically updates the Environment and a bean‑refresh technique using ContextRefreshedEvent to rebind @ConfigurationProperties, complete with code examples and testing endpoints.
This article demonstrates how to secure Spring Boot APIs by encrypting request and response bodies using custom ControllerAdvice, switching from FastJson to Jackson for proper enum and date serialization, and configuring ObjectMapper to produce consistent JSON output across encrypted and non‑encrypted endpoints.
This guide explains how Spring Boot 3.2+ leverages JDK 21 virtual threads, demonstrates common pitfalls in non‑web applications—especially daemon thread termination—and shows how to enable keep‑alive configuration to ensure your tasks keep running, complete with code examples and performance insights.
This guide walks you through the fundamentals of Java Spring Boot projects, explains WAR vs JAR deployment, sets up Maven and Jenkins, configures SSH and DingTalk notifications, and provides a complete CI/CD pipeline with scripts for automated builds and releases.
This article explores the default behavior of Spring's @Autowired annotation, how to resolve bean name conflicts, use @Qualifier and @Primary, apply @Autowired on constructors, methods, parameters, and collections, and troubleshoot common issues such as missing annotations, filter injection, component scanning, and circular dependencies.
This article introduces a powerful Java parameter‑validation library based on Spring Expression Language, explains its features, supported annotations, usage examples, configuration steps, and how to extend it with custom constraints, providing a complete guide for backend developers.
This article explains nine typical scenarios that cause the Spring @Async annotation to fail—ranging from missing @EnableAsync to improper method visibility, return types, static or final modifiers, missing @Service, manual object creation, and incorrect component scanning—providing clear explanations and code examples for each case.
This tutorial explains RSA asymmetric encryption and signing, then walks through securing Spring Boot API endpoints by adding annotations, configuring keys, integrating JavaScript decryption, and addressing practical deployment considerations to protect data from interception and tampering.
This article explains how to improve Spring Boot API response speed by designing a cache‑warm‑up mechanism, hierarchical caching with local and Redis layers, and a functional‑programming template for cache‑first queries, providing complete Java code examples and integration guidelines.
This tutorial walks through installing Portainer, using Docker‑compose to set up a Redis master‑slave‑sentinel architecture, creating a custom bridge network, testing failover, and finally configuring a Spring Boot application to connect to the Sentinel cluster with Lettuce and connection‑pool settings.
This article walks through Spring Security fundamentals, covering authentication mechanisms, authorization configuration, dependency setup, custom user details with database integration, and how to replace the default login page with a custom one, all illustrated with code snippets and screenshots.
This guide explains how to set up Graylog for centralized log aggregation using Docker Compose, configure its inputs, and integrate it with a Spring Boot project via Logback GELF appender to enable searchable, centralized logging across microservice instances.
This article explains how to design and implement a fixed-size FIFO export queue in a Spring Boot backend, using synchronized methods, EasyExcel for large data exports, and a test controller to simulate concurrent export requests, while discussing performance considerations and future enhancements.
This tutorial walks through setting up Spring AI 0.8.1 with Spring Boot 3.1.1, configuring Alibaba Tongyi model access, and implementing chat, streaming, image, and audio generation endpoints using Java code and vector database integrations.
This article demonstrates how to implement image anti-hotlinking in a Spring Boot application by creating a configurable interceptor, registering it, and providing flexible YAML settings, while discussing limitations such as referer spoofing and potential false positives.
This article presents a complete Netty TCP client demo for an IoT project, explaining the project background, architecture, modules, business flow, and detailed Java code—including a local queue, thread pool, client initialization, handler logic, and test controllers—along with deployment notes and source links.
This article explains how to use Spring's TransactionSynchronizationManager to detect active transactions and register callbacks that asynchronously send Kafka messages only after a transaction successfully commits, illustrated with a payment‑system case study and complete code examples.
This article introduces the RSocket binary protocol, explains its four interaction models, highlights key features such as back‑pressure and lease, and provides step‑by‑step Spring Boot 2.7 examples for Request‑Response, Request‑Stream, Channel, and Fire‑and‑Forget communication.
In Spring Boot, using @Transactional and @Async on the same service method does not invalidate the transaction, but the asynchronous execution runs in a separate thread with its own transaction, isolated from the original thread's transaction due to AOP interceptor ordering.
This tutorial walks through configuring Spring Cloud OpenFeign with Spring Boot, covering basic setup, advanced capabilities like Micrometer metrics, Redis caching, @SpringQueryMap, @MatrixVariable, and @CollectionFormat, and shows how to view metrics via Prometheus or Actuator.
This tutorial demonstrates adding JsonPath to a Spring Boot project, using DSL‑style expressions to extract authors, titles, counts and filtered data from a sample JSON payload, and shows how to drive the extraction dynamically via configurable mappings with fastjson and hutool.
This article demonstrates how to use Java reflection in Spring Boot projects to automatically enforce naming conventions and coding standards, thereby enhancing code quality, maintainability, and scalability while providing practical demo steps and code examples.
This article explains how the @JsonView annotation in Spring Boot lets developers define multiple JSON views to selectively expose fields based on client needs, user roles, API versions, or data aggregation requirements, providing code examples and practical usage tips.
This article introduces Flyway as a database migration tool, explains its migration types and common commands, demonstrates how to integrate Flyway with Spring Boot using Maven and YAML configurations, provides example SQL migration scripts and logs, and briefly mentions related community promotions.
This tutorial explains how to deploy Graylog using Docker‑Compose for centralized log aggregation in a microservices environment and shows step‑by‑step integration of Graylog with a Spring Boot application via Logback‑GELF, including configuration, code examples, and basic log search queries.
This article provides a step‑by‑step tutorial on installing Flowable‑UI, designing BPMN diagrams, setting up a Spring Boot backend project, configuring the database tables, and using Flowable engine APIs with complete code examples and deployment instructions.
This article introduces Spring Cloud Gateway as a high‑performance, reactive API gateway for microservice architectures, explains why it is chosen, details Maven and YAML configuration, demonstrates routing predicates and filters with code examples, and evaluates its performance impact compared to alternatives.
This article explains why a Spring Boot 2.0.3 application creates two UserManager beans when both @Configuration + @Bean and @Component are used, how the container decides which instance is injected, and how newer Spring versions allow developers to control bean‑definition overriding via configuration.
This tutorial explains Lua scripting fundamentals, why Lua is ideal for Redis, common use cases, and step‑by‑step integration of Lua scripts into Spring Boot applications—including dependency setup, configuration, code examples, performance benefits, error handling, security considerations, and best‑practice recommendations.
This article analyzes how Redis pipelining works, compares Lettuce and Redisson clients under Spring Boot, presents performance benchmarks for batch inserts, discusses practical pitfalls, and explains the internal implementation of pipeline support in both clients to help developers avoid common issues.
mica-mqtt is a lightweight, low‑latency, high‑performance open‑source MQTT component built on Java AIO, offering full MQTT v3.1/v3.1.1/v5 support, WebSocket, REST API, client/server capabilities, clustering via Redis, GraalVM native compilation, Spring Boot starter integration, and extensive customization for IoT and messaging scenarios.
This tutorial walks through setting up a simple Spring Boot project, adding MyBatis‑Plus dependencies, configuring MybatisX in IntelliJ IDEA, generating entity, mapper, service, and controller code, and handling common connection issues, providing a complete end‑to‑end example of rapid MyBatis development.
This guide shows how to integrate the lightweight LiteFlow rule engine into a Spring Boot application, split complex business logic into reusable components, configure rule files, and use various component types—including switch, condition, and parameterized components—to achieve dynamic orchestration, hot‑reloading, and high scalability.
This article explains how to prevent duplicate submissions in Java backend services by implementing request debouncing using Redis caching and Redisson distributed locks, detailing the design of request lock annotations, unique key generation, and practical code examples for robust idempotent APIs.
This guide explains how Spring Boot 3.1.10 discovers and loads external configuration files from classpath and filesystem locations, how to customize file names and paths with spring.config.name, spring.config.location, and spring.config.additional-location, and demonstrates merging, profile-specific files, optional prefixes, wildcards, imports, and handling missing resources.
This guide walks you through setting up Spring AI, configuring model providers and vector stores, initializing a Spring Boot project, adding OpenAI credentials, and running a complete RAG (Retrieval‑Augmented Generation) demo with code snippets and sample API calls.
When converting Date parameters in OpenFeign calls, the client serializes them to strings using the local CST timezone, causing a 14‑hour discrepancy that can be resolved by using timestamps, @DateTimeFormat, or custom formatters on both client and server sides.
This tutorial walks through configuring Spring Batch on Spring Boot 2.7.16 to read data from one database, process it, and write to another, covering dependency setup, job and step beans, asynchronous execution, multithreading, job restart, and repeated launches with code examples.
The article examines how Spring Boot’s Lettuce and Redisson clients implement Redis pipelining, explains the batch‑request principle, benchmarks 100 000 set inserts showing pipeline speeds of 0.5–1.4 seconds versus 162 seconds for single commands, demonstrates Spring Data Redis callback usage, warns of high‑cost command pitfalls, and details Redisson’s RBatch internals, concluding that pipelining dramatically boosts throughput when command costs are modest.
This article explains how to analyze and optimize Spring Boot Docker images by using the new layer‑building feature in Spring Boot 2.3, restructuring Dockerfiles, and employing multi‑stage builds to eliminate duplicate layers, dramatically shrink image size, and speed up image pushes.
MyBatis-Plus, an enhanced MyBatis toolkit, simplifies CRUD operations and injects dynamic SQL to boost productivity; this guide outlines its core features, important upgrade notes—including MyBatis 3.5.16 and JSqlParser 4.9 versions—provides a detailed changelog, and shows Maven dependencies for Spring Boot 3.x and 2.x.
This article examines why HikariCP, the default Spring Boot 2.0 connection pool, achieves high performance by exploring its design concepts such as dual HikariPool instances, FastList, custom ConcurrentBag, thread‑local caching, and bytecode optimization, and includes sample Maven configuration and Java code.
This guide explains how to implement a robust, re‑entrant distributed lock using Redisson in a Spring Boot 2.7 application, covering basic and asynchronous APIs, Maven dependency setup, YAML configuration, custom annotation, AspectJ implementation, and comprehensive test cases.
Learn how Cross-Origin Resource Sharing (CORS) works, when it’s needed, the role of preflight requests, essential HTTP headers, and step-by-step Spring Boot solutions—including @CrossOrigin annotations, global configuration, and custom filters—to securely enable cross-domain calls in your applications.
This article explains how to build a reusable Spring Boot starter that automatically encrypts response data and decrypts request payloads using Hutool-Crypto's AES utilities, covering request stream handling, validation, custom starter configuration, and example code for controllers and entities.
This article introduces WeBlog, a Spring Boot + Vue 3.2 based front‑and‑back end blog, details its core features, module structure, technology stack, provides repository links and demo credentials, and showcases screenshots of the admin dashboard and user interface.
This article presents Liteflow, a lightweight yet powerful Java rule engine that supports XML/JSON/YAML rule files, multiple storage backends, and hot‑deployment, and demonstrates its components, configuration, and a real‑world e‑commerce workflow example with code snippets.
Graceful Response is a Spring Boot library that provides unified response wrapping, global exception handling, custom error codes, validation support, and configurable response styles, enabling developers to write cleaner controller code, reduce boilerplate, and improve API consistency.
This article explains how to integrate Lua scripts with Redis in a Spring Boot application, covering Lua basics, performance benefits, common use cases, step‑by‑step configuration, Java code examples, error handling, security considerations, and best practices for reliable backend development.
This article provides an in‑depth overview of WebSocket, covering its definition, advantages and disadvantages, protocol details, connection lifecycle, message format, JavaScript and Java APIs, Spring Boot integration, performance considerations, and future development directions.
This guide shows how to integrate the open‑source Tesseract OCR engine into a Spring Boot application using the Tess4J Java wrapper, covering Chinese language data setup, Maven dependency configuration, bean creation, service implementation, and a unit test to verify image text extraction.
This article explains how to integrate Lua scripts into Spring Boot applications for Redis, covering Lua fundamentals, performance benefits, common use cases, step‑by‑step implementation with Spring Data Redis, error handling, security considerations, and best‑practice recommendations.
This article explains the five major Spring Boot extension points—ApplicationContextInitializer, ApplicationListener, Runner, BeanFactoryPostProcessor, and BeanPostProcessor—showing how to register custom implementations via SPI, where they are invoked in the startup flow, and providing code examples for each.
This guide explains how to configure logging in Spring Boot, handle EnvironmentChangeEvent updates, use @RefreshScope limitations, encrypt properties with Spring Cloud, leverage Actuator endpoints for environment refresh, and create custom property sources via spring.factories, providing code examples throughout.
This article explains how to achieve zero‑downtime releases for Java applications by using JVM shutdown hooks, Spring context events, and service‑registry tricks for both monolithic and microservice architectures, with concrete code samples, configuration details, and Kubernetes probes to ensure seamless online upgrades.
This article explains the concept of graceful shutdown, walks through a Kubernetes pod termination flow, demonstrates a Spring Boot + Nacos example with PreStop hooks, identifies common pitfalls, and provides practical optimizations—including MQ handling, scheduled tasks, traffic control, and actuator shutdown—to achieve reliable, zero‑downtime service termination.
A single overly long line in /etc/hosts caused Spring Boot to hang while fetching Apollo configuration on CentOS 6, and splitting the line into shorter entries resolved the issue, highlighting a subtle hosts‑file limitation in older Linux kernels.
This article explains how to integrate Apache Kafka into a Spring Boot project, covering dependency setup, producer and consumer configuration, code examples, and optimization tips to build a high‑throughput, reliable message processing system.
This tutorial introduces the EasyCode IntelliJ IDEA plugin, explains how to install it, connect a database, configure generation settings, and automatically produce Java CRUD components such as entities, DAOs, services, and controllers, concluding with integration steps in a Spring Boot application.
This article explains how to integrate Lua scripts into Spring Boot applications using Redis, covering Lua basics, advantages of Lua in Redis, practical use cases, step‑by‑step implementation with code examples, performance optimization, error handling, security considerations, and best practices for reliable backend development.
This article explains how Spring Boot's @Conditional annotations—covering class, bean, property, resource, web application, and SpEL expression conditions—can be used to conditionally load configuration and beans, with examples and guidance on custom conditions.
This article explains the concept of graceful shutdown, demonstrates it with Kubernetes‑SpringBoot‑Nacos case studies, analyzes common issues, and provides optimization strategies such as adjusting terminationGracePeriodSeconds, using PreStop hooks, handling MQ and scheduled tasks, and leveraging actuator shutdown for reliable service termination.
This guide walks you through creating a Spring Boot project, integrating the Druid connection‑pool, configuring its WebStatFilter and StatViewServlet for full SQL monitoring, testing the setup, and removing the built‑in advertisement via a custom filter.
This article explains Spring Web MVC.fn's functional programming model, covering HandlerFunction, immutable request/response contracts, parameter validation, routing predicates, nested routes, filters, and provides complete code examples for building functional endpoints in Spring Boot 2.7.
This article introduces Spring 6's new HTTP Interface feature, walks through building a Spring Boot project with a User entity, a REST controller, an HTTP Interface definition, and a test using WebClient, while explaining related annotations and the need for Spring Reactive Web dependencies.
This tutorial explains how to let users upload PDF, Word, or TXT files, install the Elasticsearch Ingest Attachment Processor Plugin, create an ingest pipeline and index mapping, convert files to Base64, and perform fuzzy searches with highlighted results using Spring Boot and Java code examples.
This article walks you through creating a custom Spring Boot Starter, covering project setup, Maven dependencies, auto‑configuration classes, registration via spring.factories (or the new imports file), and comprehensive unit testing strategies to ensure reliable conditional behavior.
This tutorial shows how to install HashiCorp Vault, configure its secret engines, encrypt and decrypt data, store KV secrets programmatically, and integrate Vault with Spring Boot to protect sensitive configuration such as database credentials.
This article introduces the design and implementation of a remote hot‑deployment component (Mark42/Jarvis) built on Java Agent and an IDEA plugin, analyzes the challenges of dynamic compilation in Spring‑Boot fat‑jar environments, presents solution choices, and shares practical experiences and future directions.
This tutorial walks through setting up a Spring Boot backend, adding the Tess4J OCR library, creating a service and REST controller to recognize text from both local files and remote image URLs, and provides testing steps and deployment tips.
This article explains how to replace repetitive manual if‑else checks with Spring Boot’s built‑in Bean Validation, demonstrating the use of @Valid, @Validated, custom constraint annotations, group validation, and global exception handling to achieve clean, reusable, and maintainable parameter validation across controllers and services.
Learn how Spring Boot 2.7.16 leverages ApplicationEvent and ApplicationListener for synchronous event handling, then explore two asynchronous approaches—using @Async with @EventListener and custom thread pools with a bespoke ApplicationEventMulticaster—complete with code examples and configuration details.
This guide walks through creating a Spring Boot backend that accepts PDF, Word, and TXT uploads, extracts their text using Elasticsearch's ingest‑attachment plugin, stores metadata in MySQL, and provides fuzzy search and highlighted results via Elasticsearch queries.
This tutorial walks through creating a Spring Boot application that integrates the OpenAI ChatGPT API, covering prompt concepts, API endpoint details, required request parameters, project setup, necessary dependencies, DTO definitions, RestTemplate configuration, and a REST controller to generate AI‑driven responses.
This tutorial explains how Spring Boot's @ResponseStatus annotation works, demonstrates practical ways to throw ResponseStatusException, create custom exception classes, annotate controller methods, and replace the default error view with a custom JSON response, complete with code samples and diagrams.
This article demonstrates how to boost the insertion speed of over two million records by configuring a Spring Boot ThreadPoolTaskExecutor, integrating it with MyBatis‑Plus and PostgreSQL, and measuring multi‑threaded versus single‑threaded performance to determine the optimal thread count.
