This article walks through the complete process of implementing a custom login authentication in Spring Boot, including custom authentication filters, success/failure handlers, a token stored in Redis, role‑based URL security, and detailed configuration of Spring Security headers and session handling.
This article explains cache prewarming—its purpose, benefits, and various strategies such as startup loading, scheduled tasks, manual triggers, and cache loaders—while providing concrete Spring Boot and Redis examples, including code snippets for ApplicationReadyEvent, CommandLineRunner, InitializingBean, @PostConstruct, @Scheduled, and Caffeine cache loader.
This article explains the concepts, architecture, and practical usage of Liteflow, a lightweight Java rule engine that integrates with Spring Boot, supports various rule file formats, multiple component types, data contexts, and configuration options for building complex workflow processes in backend applications.
This guide demonstrates how to retrieve command‑line arguments, use JSON‑encoded properties, load external configuration files, encrypt values, parse YAML, generate random properties, handle internationalization, customize the banner, and configure the application context in Spring Boot 3.0.9, providing code examples for each feature.
This article walks Java and Spring Boot developers through installing Camunda, configuring dependencies, setting up the database, creating a simple BPMN process with user and service tasks, and testing the workflow via the Camunda web interface, providing code snippets and screenshots for each step.
This article explains how to replace repetitive try‑catch blocks in Java Spring applications with a unified exception handling strategy using @ControllerAdvice, custom Assert utilities, and enum‑based error codes, providing clean, maintainable code and consistent API responses.
This guide walks you through setting up Spring Cloud Task on Spring Boot 2.7 with Spring Cloud 2021, covering environment requirements, Maven dependencies, configuration files, task annotations, ApplicationRunner implementation, database schema, task listeners, and advanced task configuration options.
This article explains three Spring Boot approaches—using @Scheduled tasks, RabbitMQ delayed queues, and Redis key‑expiration events—to automatically cancel orders that remain unpaid for 30 minutes, complete with code samples and configuration guidance.
This article explains the core extension points of Spring Boot—including ApplicationContextInitializer, ApplicationListener, Runner, BeanFactoryPostProcessor, and BeanPostProcessor—showing how they are discovered via SPI, registered in spring.factories, and invoked during the application startup lifecycle.
This article explains how to use Spring Boot Security for authentication and improve performance by caching user details in Redis, covering dependency setup, security configuration, Redis integration, testing endpoints, and optimization tips for a robust backend authentication solution.
This guide explains how to use Spring Integration's LockRegistry for distributed locking, covering both database‑based and Redis‑based implementations, complete with Maven dependencies, configuration snippets, bean definitions, and comprehensive test cases to ensure reliable synchronization across multiple nodes.
This article explains the concept of SQL injection, demonstrates a vulnerable query example, and provides a step‑by‑step Spring Boot and MyBatis implementation—including table creation, Java controller, service, DAO, mapper, and configuration—to illustrate how proper parameter handling prevents injection attacks.
This tutorial walks you through creating a Spring Boot project, configuring OpenAI credentials, building a controller, and using Spring AI's Prompt and PromptTemplate classes to integrate generative AI capabilities into your backend application.
This article explains the core concepts, architecture, and implementation details of Xxl-Job, a lightweight distributed task scheduling platform, covering the scheduler center, executor, job handling, demo setup, routing strategies, trigger mechanisms, and result callbacks.
This article explains why MQ is needed beyond in‑process event listeners, details the required dependencies for Spring Boot 3, shows how to configure RocketMQ, provides code snippets for producer, consumer, and testing, and offers practical tips for handling async, batch, and one‑way messaging.
This guide explains how to secure Spring Boot API responses using RSA asymmetric encryption, covering the theory of RSA, practical scenarios, Maven setup, annotation‑based encryption/decryption, configuration files, and a JavaScript front‑end example for encrypting request payloads.
This article introduces the MyBatis‑Plus Generator UI, a highly customizable web‑based code generation framework that supports multiple databases, explains its core features, provides step‑by‑step integration with Spring Boot, and demonstrates how to extend templates and configure naming conventions for efficient backend development.
This article evaluates the performance of Spring Boot 3.2's virtual threads when serving static files, comparing them with traditional platform threads across various concurrency levels, and concludes that platform threads slightly outperform virtual threads in this I/O‑bound scenario while suggesting better use cases for database‑driven workloads.
This guide explains how to protect Spring Boot production packages from decompilation by using the ClassFinal Maven plugin for code encryption, configuring machine‑bound startup, and comparing it with ProGuard obfuscation, including detailed plugin setup, launch commands, and observed decompilation results.
This article explains why duplicate form submissions occur, the risks they pose, and demonstrates a Spring Boot solution that uses a custom @RequestLock annotation together with Redis SETNX to generate a unique key and block rapid repeated requests, complete with project setup, code examples, and usage instructions.
This article provides a step‑by‑step guide to building a Spring Boot starter that abstracts Amazon S3‑compatible object storage services such as Alibaba Cloud OSS, Tencent COS, Qiniu OSS, and MinIO, covering dependency setup, configuration properties, template interfaces, implementation, auto‑configuration, packaging, and testing.
This article explains why scheduled jobs run twice in a multi‑node deployment, shows how to isolate the timing logic into a single service, and demonstrates using ElasticJob with Zookeeper for sharding, distributed locks, and high‑availability to ensure each task executes exactly once.
This article explains how to implement API request rate limiting in Spring Boot by creating a custom @RequestLimit annotation, using Redis to track request counts, and configuring a HandlerInterceptor and WebMvcConfig to enforce limits on controller methods.
This tutorial explains why BeanUtil.copyProperties is discouraged in Java projects and shows how to install and use the Bean Converter IDEA plugin to automatically generate setter injection code, streamlining bean mapping and improving development efficiency.
This guide walks developers through upgrading from Spring Boot 2.x to 3.x, covering JDK 17 migration, pom.xml changes, configuration property updates, Jakarta EE transition, security reconfiguration, Kafka template adjustments, and OpenAPI integration, with code examples for each step.
This article summarizes a video tutorial that introduces Spring AI, a new project enabling generative AI in Spring Boot applications, demonstrates adding dependencies, configuring OpenAI or Azure OpenAI API keys, using prompts, templates, output parsers, and showcases converting AI responses into domain objects.
To achieve fast bulk inserts in MyBatis, open a session with ExecutorType.BATCH and insert records individually (letting JDBC batch them), limit foreach‑generated statements to about 20‑50 rows, or use MyBatis dynamic‑SQL or plain JDBC batch, avoiding massive SQL parsing and CPU overload.
This article explains how to use Maven profiles and the Maven Assembly Plugin to create environment‑specific Spring Boot zip packages and provides a reusable shell script (shenniu_publish.sh) for extracting, starting, stopping, and restarting the packaged JAR on Linux, improving deployment efficiency.
This article explains the Server‑Sent Events (SSE) technology behind ChatGPT's streaming responses, compares SSE with WebSocket, outlines its core implementation steps, and provides a complete Spring Boot example for pushing live stock prices to browsers.
This article explains ten practical techniques for implementing robust parameter validation in Spring Boot applications, covering built‑in annotations, custom constraints, server‑side checks, internationalization, validation groups, cross‑field rules, exception handling, testing, and the importance of complementary client‑side validation.
This article explains why traditional LIKE queries fail on encrypted sensitive fields, analyzes common scenarios, and presents four practical solutions—including tokenized ciphertext mapping—along with environment setup, Maven dependencies, and complete Spring Boot code to enable secure fuzzy searches on encrypted data.
This guide explains why and how to create a custom HttpMessageConverter in Spring Boot 2.7.12, covering the implementation of the converter, its registration in the MVC configuration, testing with Postman, and the underlying request‑response processing mechanism.
This guide walks through integrating MyBatis‑Plus with Spring Boot, covering dependency setup, configuration, entity annotations, CRUD operations, pagination, logical deletion, enum handling, automatic field filling, multi‑data‑source support, and testing with concrete code examples and detailed explanations.
This article introduces mybatis-plus-generator-ui, a highly customizable web‑based code generator built on MyBatis‑Plus that supports multiple databases, offers interactive UI for generating Entity, Mapper, Service, Controller and other layers, and provides detailed usage, configuration, and extension instructions for Java backend developers.
This article presents mybatis-plus-generator-ui, a web‑based code generation framework that wraps MyBatis‑Plus, explains its features, shows how to integrate it via Maven and a Spring Boot entry point, demonstrates customization through templates and NameConverter, and provides guidance for building the UI frontend.
Spring Boot 3.2 now fully supports Java 21, Project Loom virtual threads, and GraalVM native images, and this guide walks through installing Java 21‑GraalVM, configuring virtual threads, building sample controllers, async and scheduled tasks, and creating a native executable to achieve faster startup and lower memory usage.
This tutorial explains how to integrate Feign‑reactive into a Spring Boot 2.7 application, covering dependencies, reactive interface definitions, fallback handling, custom configurations, timeout, load‑balancing, and circuit‑breaker settings with complete code examples.
The article details a step‑by‑step investigation of a Spring Boot service that failed to meet a 500 requests/second target, analyzes slow SQL, thread‑pool misconfiguration, excessive logging, and high CPU usage, and presents concrete optimizations that roughly doubled throughput.
This release note summarizes Spring Boot 3.2.1's extensive bug fixes, documentation updates, and a comprehensive set of dependency upgrades, providing developers with essential information to upgrade their applications safely and efficiently.
This article explains how to classify interface exceptions, implement unified handling using Spring Boot's @ControllerAdvice and custom ErrorController, and provides practical code examples for business, system, client, and filter exceptions, including redirect and error page strategies.
This article walks through multiple ways to add text or image watermarks to PDF files in a Spring Boot application, covering Apache PDFBox, iText, Ghostscript command‑line, Free Spire.PDF, and Aspose.PDF, with Maven dependencies, step‑by‑step code examples, and practical tips for preserving original documents.
This article explains how to set up WebSocket communication in Spring Boot 2.7.12, covering the protocol basics, handshake process, custom HandlerMapping, annotation-driven routing, and a reactive WebFlux handler with code examples, plus deployment considerations behind reverse proxies.
This article explains how to build a high‑performance file chunk (slice) upload system using Spring Boot and MinIO, covering project setup, MinIO configuration, controller and service implementation, front‑end integration with Thymeleaf, and performance optimizations such as parallel uploading and resumable transfers.
This article introduces the MyBatis-Plus Generator UI, a web‑based tool that streamlines Spring Boot code generation for entities, mappers, services, and controllers, explains how to integrate it via Maven, configure databases, customize templates, and extend its functionality with custom name converters.
This guide introduces Spring Boot 3.2's new JdbcClient, explains how to add the dependency, inject it, and perform fluent, chainable CRUD operations—including queries by ID, custom conditions, named parameters, map parameters, row mapping, and inserts—while highlighting its advantages over traditional ORM tools.
This guide demonstrates five practical Spring Boot 3 techniques—including using @ConfigurationProperties with validation, handling missing @Value entries, defining custom property sources, enforcing required properties, and parsing YML files—to ensure robust configuration management and prevent startup failures.
This article demonstrates how to use Spring Boot 3.2 with Java 21, enabling virtual threads and GraalVM native images, providing step‑by‑step setup, configuration, and sample code for controllers, async tasks, and scheduled jobs, and discusses performance benefits and considerations.
This article explains the default Tomcat settings in Spring Boot 2.7.10, detailing connection queues, thread pool parameters, timeout configurations, and internal threading architecture, and provides practical examples and testing results for various concurrent connection scenarios.
This guide explains why Spring Boot 2.7 is the optimal bridge to JDK 17, details the new language and performance features, provides step‑by‑step deployment and configuration instructions for JD Cloud, and shares practical compatibility fixes and IDE tips for a smooth migration.
This article analyzes the inefficiencies and duplication in typical Spring Boot controller code, introduces the Graceful Response library, and provides step‑by‑step instructions—including Maven integration, annotation setup, controller and service examples, exception mapping, validation handling, and response style configuration—to achieve cleaner, unified API responses.
This guide explains how to protect Spring Boot production packages from reverse engineering by applying code obfuscation with ProGuard and full encryption using the ClassFinal Maven plugin, including configuration steps, encrypted startup commands, machine‑binding activation, and the resulting decompilation behavior.
This article introduces mica-auto, an annotation‑processor‑based tool that automatically generates Spring Boot starter configuration files—including spring.factories, AutoConfiguration.imports, and java SPI settings—enabling seamless compatibility with Spring Boot 3.x without maintaining separate branches.
This guide walks you through building a Spring Boot application that calls the OpenAI ChatGPT API, covering prompt concepts, API request details, required dependencies, configuration of RestTemplate with authentication, DTO definitions, controller implementation, and example use cases.
This article explains the concept of idempotency, presents several strategies to achieve it, and provides a complete Spring Boot implementation using Redis, a custom @AutoIdempotent annotation, token generation and verification, interceptor configuration, and test cases to ensure only the first request succeeds.
This article explains how to retrieve and handle various Spring Boot API parameters—including query, path, request body, header, and file uploads—covers parameter type handling such as dates and lists, demonstrates validation annotations, and provides complete code examples for each scenario.
This guide walks through configuring a Spring Boot 2.4.12 project with Elasticsearch 7.8, creating index templates, implementing bulk write operations, and testing the setup with sample code and endpoints, enabling automatic index creation and efficient data ingestion.
This article explains the CQRS pattern, its origins, benefits, and pitfalls, then details how to implement CQRS and event sourcing in Spring‑based microservices using Axon and Kafka, while discussing architectural considerations, scalability, consistency, and tooling.
This article explains the concept of graceful shutdown, outlines the essential steps, and demonstrates a practical Kubernetes‑Spring Boot‑Nacos case study, including PreStopHook handling, terminationGracePeriodSeconds tuning, and further optimizations for message queues, scheduled tasks, and traffic control.
Graceful Response is a Spring Boot library that provides unified response wrapping, global exception handling, and customizable error codes, reducing boilerplate code, improving readability, and streamlining validation for Java web APIs.
Learn how to integrate Spring Boot WebFlux with R2DBC for reactive database operations, covering R2DBC basics, driver selection, configuration, entity and service implementation, controller endpoints, repository usage, optimistic locking, and practical code examples to build high-performance, non-blocking backend applications.
This guide explains how Spring Boot 3.2 leverages the OpenJDK CRaC project to create and restore JVM checkpoints, dramatically reducing application startup time through automatic and manual checkpoint techniques, complete with required dependencies, installation steps, and performance results.
This article provides a step‑by‑step guide on integrating Spring Batch with Spring Boot, covering business scenarios, database setup, Maven dependencies, configuration of JobRepository, JobLauncher, Job, Step, ItemReader, ItemProcessor, ItemWriter, listeners, validators, execution via REST endpoints, troubleshooting with Druid and switching to HikariCP, and demonstrates processing CSV and database data in large batches.
This article explains the concept of idempotency, outlines common strategies, and provides a complete Spring Boot implementation that uses Redis, a custom @AutoIdempotent annotation, token generation, and a web interceptor to ensure each API request affects the database only once.
This tutorial walks through advanced Spring Cloud Function features—including handling HTTP request parameters, function mapping and filtering rules, functional bean definitions, visualization via Actuator, and package scanning—providing code examples and configuration tips for Spring Boot 2.7.15 projects.
This article walks through the complete process of adding Dataway to a Spring Boot application, covering Maven dependencies, configuration properties, database schema creation, data source setup, Hasor module integration, enabling Hasor in Spring, and finally creating and testing API endpoints using both SQL and DataQL, all illustrated with concrete code snippets and log output.
This article explains the underlying principles and step‑by‑step configuration for integrating Spring Boot with MyBatis to manage multiple data sources, covering BeanFactory, FactoryBean, SqlSessionFactoryBean setup, datasource properties, mapper scanning, and sample controller code for accessing distinct databases.
This article explains the Spring MVC return‑value handling mechanism, demonstrates how to implement a custom HandlerMethodReturnValueHandler, register it correctly in a WebMvcConfigurer, and troubleshoot why the default processor may override custom handlers.
Graceful Response is a Spring Boot component that unifies response wrapping, global exception handling, and custom error codes, helping developers reduce boilerplate, improve readability, and accelerate API development while supporting validation and customizable response styles.
This article demonstrates how to enable and use Coordinated Restore at Checkpoint (CRaC) in Spring Boot 3.2 with the Spring Petclinic example, covering required dependencies, JVM setup, automatic and manual checkpoint creation, performance measurements, and best‑practice considerations for backend developers.
Redis serves as a powerful in‑memory key‑value store for distributed caching, offering various data structures, persistence options, deployment modes, eviction policies, and update strategies, while addressing consistency challenges, cache miss scenarios, and failure modes such as penetration, breakdown, and avalanche.
This tutorial demonstrates how to create a universal CSV/Excel export utility in Java that can handle objects of any class by using reflection to generate headers and rows, leveraging Apache POI and Spring Boot for seamless file generation.
This article explains why caching is crucial for Spring Boot applications, examines its impact on microservice architectures, outlines criteria for selecting the right cache—usability, speed, availability, observability—and compares local, distributed, and hierarchical caches with practical strategies and code examples.
This article provides a detailed overview of Druid, a high‑performance Java database connection pool, covering its core concepts, Maven dependencies, extensive configuration options, monitoring filters, SQL slow‑query logging, and methods to customize or remove the built‑in advertisement page.
This article explains how to implement unified exception handling in Spring Boot applications using @ControllerAdvice, custom Assert utilities, and enum-based error codes, demonstrating code examples, response structures, and best practices for reducing try-catch clutter, improving readability, and handling various HTTP and business exceptions consistently.
This article explains how Spring Boot packages applications as executable Fat JARs, embeds a web server, uses a special launcher, and defines a main class so the JAR can be run with a simple java -jar command, eliminating the need for separate deployment servers.
This guide explains how to use Spring's ResponseBodyAdvice to create a unified response wrapper for RESTful APIs, improving consistency, readability, and extensibility while handling common pitfalls such as String return type errors.
This tutorial introduces Spring Cloud Function, explains its core concepts and benefits for serverless development, and walks through a complete example—including configuration, code snippets, HTTP endpoints, function composition, custom routing, and deployment—so readers can quickly build and test function‑based applications.
This article explains how to achieve automatic request idempotency in Spring Boot applications by using Redis for token storage, custom @AutoIdempotent annotation, and a web interceptor that validates tokens, providing code examples, configuration steps, and testing procedures.
This guide explains RabbitMQ fundamentals—including brokers, virtual hosts, connections, channels, exchanges, queues, producers, and consumers—covers common messaging patterns, provides step‑by‑step Java code for creating connections, declaring exchanges and queues, publishing and consuming messages, handling acknowledgments and confirmations, and shows how to integrate RabbitMQ with Spring Boot.
This article explains the three JVM termination modes, how to use shutdown hooks and Spring's lifecycle events to implement graceful shutdown of HTTP, RPC and MQ entry points, manage thread‑pool termination, and avoid resource‑leak or inconsistent state during service redeployment.
This tutorial explains how to extend Spring MVC's HandlerMapping by implementing a custom RequestCondition that matches requests based on an x-token header and a custom @AKF annotation, covering code implementation, configuration, testing, and the underlying request‑matching mechanism.
This guide explains Druid's core concepts, how to add Maven dependencies, configure properties, enable monitoring filters, customize the admin servlet, remove built‑in ads, and retrieve runtime statistics, providing a complete tutorial for integrating Druid with Spring Boot applications.
The article explains that Spring Boot 3.x drops support for Java 8, causing IntelliJ IDEA’s Spring Initializr to list only JDK 17 or higher, and shows how developers can still create Java 8 Spring Boot projects by switching the Initializr URL to Alibaba Cloud’s start service.
This article demonstrates how Spring Boot 3.2 leverages the OpenJDK CRaC project to dramatically cut application startup time, covering required JVM, dependencies, Zulu JDK setup, automatic and manual checkpoint creation, performance benchmarks, and restoration steps, all using the Petclinic example.
This article introduces Resilience4j, a lightweight fault‑tolerance library for Spring Boot, explaining its core decorators—CircuitBreaker, TimeLimiter, Bulkhead, and RateLimiter—along with configuration examples, annotation usage, fallback handling, and practical test code to improve system stability and resilience.
This article evaluates the startup speed, memory consumption, and request‑handling performance of a simple Spring Boot "Hello World" service when run on the traditional JVM compared with a GraalVM‑compiled native binary, using a MacBook M1 and Bombardier for load testing.
This tutorial demonstrates how to prompt Tencent Hunyuan’s large‑model API to generate a Spring Boot project configured for MySQL, create a user table, and implement full JPA‑based CRUD layers—including entity, repository, service, and REST controller—while addressing common null‑field errors and testing the endpoints.
This article demonstrates how Spring Boot 3.2 fully supports Java 21, Project Loom virtual threads, and GraalVM native images, providing step‑by‑step instructions, configuration details, and runnable code examples that showcase building, running, and profiling a Spring Boot application with these modern technologies.
This guide explains how to create a Spring Boot custom HTTP message converter and argument resolver, register them, and use a @Pack annotation to parse a simple 'name:张三,age:20' request body into a Users object, enhancing backend flexibility.
This article provides a thorough overview of Java interview topics, covering core language fundamentals, collection frameworks, concurrency mechanisms, Spring Boot transaction handling, database indexing strategies, and network protocol comparisons, all presented in clear English with code examples and diagrams.
This article demonstrates how to implement unified user login permission checks, centralized exception handling, and consistent response formatting in Spring Boot using AOP, HandlerInterceptor, @ControllerAdvice, and ResponseBodyAdvice, providing step‑by‑step code examples and configuration details.
This article explains the CQRS architectural pattern, its benefits and challenges, and provides a step‑by‑step guide to implementing CQRS, event sourcing, and asynchronous communication with Spring Boot, Axon, and Apache Kafka in microservice environments.
This article explains how to create a reusable Maven archetype for Spring Boot applications, covering the definition and benefits of scaffolding, step‑by‑step template preparation, archetype generation, artifact adjustments, publishing to a repository, and using the scaffold to quickly start new microservice projects.
This article explains how to combine Spring AOP and Spring Security in a Spring Boot 2.7.12 application to implement permission verification, covering concepts, required dependencies, custom filters, annotations, aspect logic, global exception handling, test endpoints, JWT token handling, and extensions for SpEL‑based role checks.
This article demonstrates how Spring Boot 3.2 fully supports Java 21, Project Loom virtual threads, and GraalVM native images, guiding you through installation, configuration, sample code, and performance benefits of running a Spring application on virtual threads and native compilation.
This article provides a comprehensive guide to Flowable, a Java-based BPMN 2.0 workflow engine, covering its concepts, BPMN elements, installation, configuration, code examples, and database schema, enabling developers to design and implement employee leave approval processes.
This article explains how to use Spring Boot's YAML configuration files to define and manage simple properties, collections, maps, nested objects, and complex data structures, providing code examples and a complete sample to help developers efficiently handle intricate configuration scenarios.
Spring Boot 3.2, released shortly after Java 21, brings a host of enhancements such as virtual thread support, CRaC checkpoint restore, SSL bundle reloading, improved observability, new RestClient and JdbcClient, Jetty 12, Pulsar, Kafka and RabbitMQ SSL, redesigned nested JAR handling, Docker image build upgrades, and a comprehensive video walkthrough by Josh Long.
This article explains every Spring Boot startup event, from ApplicationStartingEvent to ApplicationFailedEvent, showing when each occurs, how to customize them, and providing clear code examples to help developers extend and debug their applications effectively.
This guide explains how to implement read‑write separation in Spring Boot applications by configuring master and slave databases, creating dynamic routing data sources, using custom annotations and AOP, integrating HikariCP and MyBatis, and handling thread‑local context for optimal performance.
