This guide walks through the complete backend workflow for generating, sending, and validating SMS verification codes in a Spring Boot application, covering code generation, API integration, session handling, and utility classes with full Java examples.
This article explains how to protect sensitive information in Spring Boot applications by encrypting configuration files with jasypt‑spring‑boot, masking API response fields using a custom Jackson annotation, and filtering log output with a custom Log4j2 PatternLayout, providing complete code examples for each method.
This tutorial demonstrates how to set up a CentOS 7.5 environment, install RabbitMQ, and use Spring Boot to create a distributed transaction system that ensures data consistency across order and dispatch services by leveraging RabbitMQ's confirm and ACK mechanisms, complete with database schema, configuration, and code examples.
This article explains the role of Spring's MergedBeanDefinitionPostProcessor, showing how it merges bean definitions, invokes post‑processors during bean creation, and enables @Autowired‑related dependency injection with code examples and detailed workflow steps.
This article compares synchronous and various asynchronous approaches for invoking multiple third‑party services in a Spring Boot order‑creation workflow, demonstrating plain sequential calls, manual thread creation, thread‑pool execution, CompletionService handling, and CompletableFuture composition, and shows their performance impact through timing results.
This article describes how to model a complex Uber‑style ride‑hailing system using Domain‑Driven Design, implement it with Java Spring Boot microservices, instrument it with OpenTelemetry for full observability, and validate the observability pipeline through a gamified chaos‑engineering approach that reduces MTTR.
This tutorial explains why parameter validation is essential in Spring Boot APIs, shows how to integrate the JSR‑303 Validator, demonstrates custom annotations, group validation, and simplifies error responses with a global exception handler, providing complete code examples for each step.
This guide explains the purpose of Spring Boot's @Enable* annotations, how they rely on @Import, and walks through creating a custom @EnablePack annotation with accompanying configuration and usage in a Spring Boot application.
This article presents a comprehensive GitHub collection of Spring Boot vulnerabilities, explains how to identify information‑leakage and remote‑code‑execution flaws via exposed Swagger and Actuator endpoints, and provides step‑by‑step verification commands for security testing.
This guide demonstrates how to integrate RocketMQ 4.8.0 into a Spring Boot 2.3.9 application, covering dependency setup, configuration, sending and receiving plain, ordered, clustered, broadcast, and transactional messages, with complete code examples and execution results.
This article explains the history, recent updates, and step‑by‑step usage of the Spring Boot Swagger starter, including dependency setup, detailed configuration options, grouping, JSR‑303 validation support, custom response messages, UI tweaks, ignored parameter types, and authorization settings.
This article explains four approaches to adding a generic appkey whitelist check in a Spring Boot web framework—traditional AOP, HandlerInterceptor, custom HandlerMethodArgumentResolver, and Servlet Filter—providing implementation steps, code examples, and a discussion of their execution order and extensibility.
This article demonstrates how to set up comprehensive monitoring for a Spring Boot application by integrating Spring Actuator, Micrometer, Prometheus, and Grafana, covering component introductions, sample code creation, Docker-based Prometheus and Grafana deployment, and dashboard configuration for real‑time metrics visualization.
This guide explains RabbitMQ dead‑letter queues, covering the conditions that turn messages into dead letters, how to configure exchanges and queues with x‑dead‑letter‑exchange, TTL, and max‑length, and provides step‑by‑step Spring Boot code examples for testing each scenario.
This article examines the advantages and hidden risks of using Lombok in Java projects, illustrating how its annotations can dramatically reduce boilerplate code while also introducing version compatibility issues, forced dependencies, reduced readability, increased coupling, and technical debt, and suggests alternative approaches for cleaner code.
This guide walks through converting a Spring Boot JAR into a Windows executable using exe4j, configuring the EXE for 32/64‑bit compatibility, adding VM parameters, and then packaging the EXE together with a local JRE into an installer with Inno Setup, providing step‑by‑step screenshots and script details.
This article explains six practical techniques for executing custom logic during Spring Boot startup, covering ApplicationListener events, CommandLineRunner, ApplicationRunner, @PostConstruct, @Bean initMethod, and InitializingBean, with code examples and brief analysis of each approach.
This article walks through the evolution of Redis‑based distributed locks, illustrating common pitfalls and step‑by‑step improvements—from simple set‑if‑absent locks to atomic UUID checks and Lua‑scripted releases, culminating in a robust Redisson solution.
This guide walks through creating a Spring Boot 2.2.11 OAuth2 authorization server that stores tokens in Redis, defines custom client and user entities, configures grant types, and demonstrates testing each flow, complete with code snippets and configuration files.
This step‑by‑step tutorial explains how to create Restful file upload and download APIs using Spring Boot 2.2.6, covering environment setup, project structure, interface and implementation details, size‑limit configuration, global exception handling, and testing the endpoints with Postman.
This guide explains how to integrate OAuth2 with Spring Boot 2.3.10, troubleshoot missing OAuth2AuthorizationRequest in the session, and resolve the issue by adjusting host configuration and domain settings, providing full code snippets and configuration details.
This tutorial walks through setting up Spring Authorization Server 0.2.0 on Spring Boot 2.5.3, covering required dependencies, security configuration, SAS server setup, testing the authorization code flow, token exchange, refresh, and revocation, with complete code snippets and curl commands.
This article explains how Spring Boot's auto‑configuration works by loading configuration classes from spring.factories, using @EnableAutoConfiguration and conditional annotations to bind properties from application.properties or application.yml to beans such as ServerProperties, enabling rapid backend development without extensive manual setup.
Learn how to configure a Spring Boot 2.3.11 project with MyBatis 3.5.6, set up dependencies, pagination, mapper scanning, define mapper interfaces with annotations, implement dynamic SQL providers, and write comprehensive unit tests to verify CRUD operations.
This guide walks through setting up WeChat web authorization, customizing Spring Security's OAuth2 flow, handling token exchange, and retrieving user info, providing a complete backend solution for secure WeChat-enabled applications.
This article explains why a DecryptionException occurs when using Jasypt in Spring Boot, outlines the typical reasons such as mismatched passwords or missing Unlimited Strength JCE, and provides step‑by‑step instructions to resolve the issue.
This article walks through setting up Spring Boot Actuator for microservice monitoring, explains the most important endpoints such as /health, /metrics, /loggers, shows how to expose and secure them, and demonstrates dynamic log level changes, custom health indicators, and integration with Spring Security.
The article introduces mica-mqtt, an open‑source MQTT component built on t‑io that offers simple, low‑latency, high‑performance messaging, outlines its features, provides Spring Boot and plain Java integration steps, shows configuration examples, and explains monitoring and clustering capabilities for IoT applications.
This step‑by‑step guide shows how to configure a Spring Boot application with Log4j2, ship logs via Filebeat to Kafka, process them with Logstash, and visualize the data in Elasticsearch and Kibana, covering server setup, Maven dependencies, configuration files, and deployment commands.
The article explains why traditional polling methods fall short for real‑time data, introduces the WebSocket protocol’s full‑duplex handshake and heartbeat mechanisms, and demonstrates how a Java‑based WebSocket service efficiently streams audio to an ASR engine for low‑latency speech recognition.
The article explains how to implement distributed tracing in a microservice architecture using Spring Cloud Sleuth and Zipkin, covering the concepts of spans and traces, configuration steps, code examples, deployment methods, sampling considerations, and persistence options such as MySQL and Elasticsearch.
This article provides a detailed walkthrough of ShardingSphere‑Jdbc read/write splitting, MySQL master‑slave replication setup with Docker, the differences between redo log and binlog, two‑phase commit, and practical sharding configurations using inline strategies and distributed primary keys in a Spring Boot project.
Learn how to integrate Spring Data Redis with Spring Boot, replace Jedis with Lettuce, define data models using @RedisHash and @Indexed, configure connection properties, implement CRUD and example queries, and understand the underlying key-value storage patterns illustrated with practical code and visual examples.
This guide walks through setting up Kafka Streams with Spring Boot 2.3, covering environment configuration, core concepts, topology design, and multiple practical examples—including message sending, listening, transformations, aggregations, filtering, branching, and multi‑field grouping—complete with full code snippets and execution results.
This article explains the inner workings of Spring Cloud's RefreshScope, covering its annotation definition, registration in the auto‑configuration, the refresh endpoint workflow, event handling, and how beans annotated with @ConfigurationProperties or @RefreshScope are dynamically refreshed at runtime.
This article explains how Spring Boot’s auto‑configuration works, covering configuration files, key annotations like @EnableAutoConfiguration, conditionals, and the role of XxxxProperties and XxxxAutoConfiguration classes in binding properties and loading beans into the Spring container.
This article explains why a custom AOP annotation like @MyMonitor may not trigger advice in Spring Boot, analyzes the proxy‑based limitation of Spring AOP, and provides practical solutions such as self‑injection or AspectJ mode to ensure the advice executes correctly.
This guide demonstrates how to create a custom request‑handling method, register it programmatically with Spring MVC's RequestMappingHandlerMapping, and explains the underlying handler detection and mapping process in Spring Boot 2.2.
The article introduces mica-mqtt, a lightweight, low‑latency, high‑performance MQTT component built on t‑io, detailing its features, configuration for Spring Boot and plain Java projects, custom interfaces, clustering, monitoring with Prometheus‑Grafana, and provides code examples for both server and client integration.
This article recounts the author’s experience building a simple Java web application for a university anniversary, covering planning, environment setup, documentation, database design, coding challenges with Spring Boot, Redis, and session handling, deployment on Alibaba Cloud, and the lessons learned about architecture, logging, and monitoring.
This article demonstrates how to create a custom @AccessLimit annotation in Spring Boot, implement a rate‑limiting interceptor that checks request frequency via Redis, register the interceptor, and apply the annotation to controller methods to enforce request limits with optional login verification.
This comprehensive guide dives deep into Spring Validation, covering basic usage, dependency setup, requestBody and requestParam validation, group and nested validation, custom constraints, fail‑fast mode, and the underlying implementation in Spring MVC and AOP, all with practical code examples.
By illustrating how to replace simple HashMap caching with Redis‑based distributed caches and locks—using SETNX, Lua scripts, and Redisson—the article shows Spring Boot developers how to prevent cache breakdown, ensure data consistency, and dramatically improve throughput in high‑concurrency web applications.
This tutorial explains step‑by‑step how to add Keycloak authentication to a Spring Boot application using the Spring Security adapter, covering Maven dependencies, configuration files, custom resolvers, role mapping, session strategies, and the typical authorization code flow.
This article demonstrates how to create a custom @AccessLimit annotation, implement a Spring Boot interceptor that checks Redis for request counts, register the interceptor, and apply the annotation to a controller method to enforce rate‑limiting with optional login verification.
Learn how to configure Spring Boot Security's remember‑me feature with a persistent token repository, set up the necessary SQL, customize the login page, and understand the underlying authentication flow to prevent duplicate logins and maintain user sessions across browser restarts.
This article walks through the Spring Security authentication flow in a Spring Boot 2.2.11 application, detailing filter execution, token creation, provider selection, custom DaoAuthenticationProvider configuration, and session management, complemented by code snippets and diagrams for each step.
This article introduces WebSocket, explains why it is preferred over HTTP for real‑time communication, and provides a complete Spring Boot integration tutorial with Maven dependencies, configuration, server endpoint code, controller, and a simple HTML client, all illustrated with runnable examples.
This article explains the challenges of distributed locking, compares existing lock services, and details the design, implementation, and monitoring features of the ylock framework, which provides reentrant read‑write locks over Redis and Zookeeper with unified APIs and Spring Boot integration.
This article explains how to use Spring Boot's @ControllerAdvice and @ExceptionHandler annotations to implement clean, global exception handling, covering basic usage, controller‑specific handlers, and ordered advice for multiple handlers, with practical code examples and diagrams.
This article walks through configuring Spring Boot 2.2.11 with Seata 1.3.0, detailing environment setup, dependency configuration, global transaction activation, proxy bean creation, data source proxying, transaction interceptor mechanisms, XID propagation via RestTemplate and Feign, and the complete commit‑and‑rollback workflow.
This article explains how to implement graceful shutdown and startup for microservices using JVM shutdown hooks, Spring Boot listeners, Docker stop signals, and external container scripts, providing code examples and best‑practice recommendations for both built‑in and external containers.
Learn how to configure and use the open‑source time‑series database InfluxDB in a Spring Boot application, covering essential concepts, dependency setup, property configuration, scheduled data writing, and verification via InfluxDB CLI, with complete code examples.
This article explains how Spring Boot’s @SpringBootApplication annotation combines several meta‑annotations, how auto‑configuration classes are loaded from META‑INF/spring.factories, and demonstrates building a custom starter that configures a Tomcat web server, with full code examples and Maven setup.
Magic-API is a Java-based rapid development framework that enables developers to create HTTP API interfaces without writing traditional controller, service, DAO, or XML code, offering extensive features, quick-start Maven integration, configurable properties, and a visual UI for managing endpoints.
This tutorial demonstrates how to combine Spring Boot, WebMagic, and MyBatis to crawl Zhihu pages, configure Maven dependencies, set up MySQL data sources, define entity and mapper classes, and schedule the crawler to run periodically, providing a complete Java web‑crawling scaffold.
This guide explains how to replace the old Alipay transfer interface with the new certificate‑based alipay.fund.trans.uni.transfer API, upgrade the SDK, configure certificates, add Maven dependencies, and implement Spring‑Boot beans and utility classes for secure payment and transfer operations.
This article compares four Spring Boot techniques—traditional AOP, HandlerInterceptor, custom HandlerMethodArgumentResolver, and Servlet Filter—for implementing a generic appkey whitelist validation, explains their implementation steps with code examples, and clarifies their execution order within the request processing pipeline.
This article explains four Spring‑Boot techniques—traditional AOP, HandlerInterceptor, HandlerMethodArgumentResolver, and Servlet Filter—to implement a reusable appkey whitelist validation, provides complete code examples for each, and clarifies their execution order within the request processing pipeline.
This article introduces wx‑manage, an open‑source WeChat public‑account management system that supports multiple accounts, offering menu, auto‑reply, material management, and a simple CMS, and details its Spring Boot‑based tech stack, required environment, and where to obtain the source code.
This guide walks through configuring Seata’s registry and configuration centers with Nacos, setting up MySQL storage, defining service modules, writing transactional code with @GlobalTransactional, and verifying rollback behavior in a Spring Boot 2.3 microservice project.
This guide explains how to upgrade Spring Boot projects to Nacos‑Spring‑Boot 0.2.10, covering new features such as full Nacos 2.0 compatibility, automatic config‑type detection, SpEL support, and high‑concurrency fixes, and provides step‑by‑step client and server deployment instructions with verification.
This guide explains the fundamentals of JSON Web Tokens, their structure and claim types, typical use cases such as authorization and secure data exchange, and provides a step‑by‑step Spring Boot implementation including dependency setup, token generation, interceptor validation, and protected endpoint testing.
This step‑by‑step guide shows how to set up the Sentinel dashboard, add the Sentinel client to a Spring Boot project, define protected resources programmatically or with annotations, start the dashboard, and configure flow‑control and degradation rules to limit API traffic.
This article explains Aspect‑Oriented Programming (AOP) in Spring Boot, covering its core concepts, why it simplifies cross‑cutting concerns like logging and permission checks, provides step‑by‑step code examples of simple and advanced AOP implementations, and details the most commonly used AOP annotations.
This article walks through setting up GitLab CI to automatically build a Spring Boot JAR, create Docker images for Java 8 and Java 11, push them to a private registry, and deploy them to a server, covering required Dockerfiles, .gitlab-ci.yml configuration, environment files, and necessary GitLab variables.
This tutorial explains why RESTful API versioning is needed, presents four versioning strategies (URI, request parameter, custom header, and media type), provides Spring Boot code examples for each, and discusses factors to consider when choosing a versioning approach.
This tutorial explains how to use Elastic Job's sharding configuration in Spring Boot to accelerate scheduled task execution, improve resource utilization, and achieve high‑availability by distributing work across multiple job instances.
This guide explains how to replace @Scheduled with the Apache ElasticJob Lite framework in a Spring Boot application, covering project setup, dependency configuration, job implementation, ZooKeeper registration, sharding settings, and testing in a clustered environment to achieve reliable distributed task execution.
This article introduces a Java web application that integrates movies, music, and books, detailing its development environment, system architecture, core features such as login, search, and recommendations, and provides step‑by‑step deployment instructions along with the GitHub source link.
This article explains how to optimize Spring Boot's embedded Tomcat settings, tune JVM parameters, configure remote debugging in IDEA, and connect to JVM tools like JConsole and JVisualVM remotely, while also providing practical code snippets and deployment tips for backend services.
This article explains Spring's Service Provider Interface (SPI) mechanisms—including spring.handlers and spring.factories—covers their implementation details with code examples, demonstrates real‑world usage in MyBatis, Dubbo and Spring Boot, and shows how to create a custom configuration file loader.
Knife4j is a lightweight, feature‑rich enhancement for Swagger that integrates seamlessly with Java MVC frameworks, offering customizable UI, advanced functionalities like interface sorting and export options, and easy Maven integration for both monolithic Spring Boot and Spring Cloud microservice architectures.
This article introduces the Flash-Waimai project—a full‑stack food delivery system built with Spring Boot, Vue.js, MySQL and MongoDB—detailing its architecture, module breakdown, database setup, quick‑start commands, and step‑by‑step instructions for launching the backend, admin portal, and mobile client.
This guide walks you through creating a Keycloak realm, registering a client, defining roles and mappings, obtaining and refreshing JWT tokens, and configuring a Spring Boot application with the Keycloak Spring Boot starter to protect endpoints via OIDC authentication.
This tutorial explains how to create and configure scheduled tasks in Spring Boot, demonstrates code examples for simple 5‑second intervals, details the @Scheduled annotation parameters, and discusses the pitfalls of clustering without distributed locks.
This article explains the Same Origin Policy, introduces CORS as its solution, and provides three practical Spring Boot configurations—including a global WebMvcConfigurer, a servlet filter, and the @CrossOrigin annotation—to enable cross‑origin requests safely and efficiently.
This article explains the background of RSocket and Dubbo 3.0, introduces the spring‑retrosocket project, and provides a detailed, code‑rich tutorial on creating an RSocket server and client in Spring Boot, including dependency setup, configuration, annotations, and testing examples.
This guide walks you through installing and configuring the ELK stack—Elasticsearch, Logstash, and Kibana—on Ubuntu, setting up Logstash shipper and indexer pipelines, integrating Spring Boot and Nginx logs, and managing the services with Supervisor for reliable, real‑time log analysis.
This article provides a thorough walkthrough of Spring Boot Actuator's native endpoints, explaining their purpose, configuration, and usage with practical code examples and screenshots, enabling developers to monitor, diagnose, and manage Spring Boot microservices effectively.
This guide walks through creating a lightweight service registration and discovery mechanism using Spring Boot 2.2.10, Zookeeper 3.6.2, and Java, covering environment setup, Maven dependencies, configuration files, core Java classes, and a test controller to verify dynamic service lists.
This article describes how a hidden 100 ms latency in a Spring Boot channel service was traced with Arthas, revealing a Tomcat‑embed bug caused by repeated loading of Swagger UI resources, and explains how upgrading Tomcat or Spring Boot eliminates the delay.
This guide shows how to use Zookeeper 3.6.2 with Spring Boot 2.2.10 to create sequential nodes, implement a distributed ID service in Java, and test concurrent ID generation across 100 threads.
This guide walks you through IntelliJ IDEA 2021’s revamped Profiler, the new microservice call‑graph analysis for Spring Boot, Micronaut and Quarkus, the Docker‑based run configurations, and the built‑in JSONPath expression debugger, showing how to leverage each feature to improve development efficiency.
This tutorial explains how to integrate Redisson into a Spring Boot application to implement robust distributed locks, covering Redisson's architecture, configuration, code examples, lock types, watchdog mechanism, and practical testing procedures for reentrant, read‑write, and semaphore locks.
This guide walks through adding Spring Boot Actuator to a project, configuring default and custom endpoints, securing shutdown operations, and demonstrates practical code snippets and curl commands for monitoring and managing a Spring Boot application.
This guide explains Spring Boot's two programmatic transaction approaches—TransactionTemplate/TransactionalOperator and direct TransactionManager—provides detailed code examples for using TransactionTemplate with return values, rollbacks, property configuration, demonstrates PlatformTransactionManager usage, and shows how to listen to transaction events with @TransactionalEventListener.
After upgrading IntelliJ IDEA, Lombok annotations may stop working and cause compilation errors, but updating Lombok to version 1.18.14 or later and adjusting IDE settings can restore functionality for Java and Spring Boot projects.
This guide demonstrates how to use Zookeeper with Spring Boot to enable data sharing among multiple JVM processes in a distributed system, covering Maven dependencies, configuration files, and Java code for connection, node watching, and data change handling.
This tutorial explains how to set up a single‑node Elasticsearch instance with Docker, integrate it into a Spring Boot application using Spring Data Elasticsearch Repositories, configure the necessary dependencies and settings, and perform basic CRUD operations and visualization with Kibana.
This article explains how to overcome Spring Boot's static @Scheduled limitation by customizing the task scheduler, creating wrapper classes and a registrar to dynamically add, remove, start, and stop cron‑based jobs, with full code examples and a database‑driven design.
This guide explains three ways to register Servlets in Spring Boot 2.3.9—including @ServletComponentScan with @WebServlet, ServletRegistrationBean, and dynamic registration via ServletContextInitializer—while detailing the underlying scanning mechanism, BeanFactory post‑processor workflow, and how Tomcat ultimately registers the servlet.
This article explains how to shrink large Spring Boot fat JAR files by separating dependencies into a lib directory and creating small business JARs, covering three optimization levels—including standard dependency separation, merging modules into a shared lib, and handling system‑scope third‑party SDKs—complete with Maven configurations and code examples.
Spring GraphQL 1.0 introduces seamless integration of GraphQL Java with Spring, offering HTTP and WebSocket handlers, security annotations, exception resolvers, testing utilities, metrics, Querydsl support, and a schema‑first approach, while outlining the roadmap and resources for developers.
This article explains how the BizLog component records who performed which action at what time in Spring Boot applications, covering Maven setup, annotation usage, custom operators, detail fields, category segregation, SpEL expressions, custom parse functions, and extension points for persistence and operator retrieval.
This article provides a comprehensive guide on integrating the Alibaba Druid JDBC connection pool into a Spring Boot application, covering its components, powerful monitoring features, password encryption, SQL parsing, Maven and YAML configuration, filter setup, and how to access the Druid monitoring console.
This article introduces Spring Cache as a unified caching solution that abstracts away the specifics of Redis, Ehcache, and other providers, explains its core concepts, annotations, configuration, and demonstrates practical usage with code examples to eliminate manual cache handling.
This article explains the concept, characteristics, and multiple implementation approaches of distributed locks, focusing on Redis‑based locks and the Redlock algorithm, and provides complete Java code examples using Spring Boot and Redisson for acquiring and releasing locks safely.
This guide walks through setting up a Spring Boot 2.1.4 application with JDK 1.8, Oracle, and HikariCP to use separate master and slave data sources, covering Maven dependencies, YAML configuration, custom property classes, JPA EntityManager factories, MyBatis SqlSession factories, mapper scanning, and sample entity definitions.
This article provides a comprehensive tutorial on the fundamentals of microservices, explains how to set up a Spring Cloud project with Maven and IntelliJ IDEA, configures Eureka registration and discovery, demonstrates service provider and consumer implementations using Spring Boot, and shows how to achieve high‑availability Eureka clusters with load‑balanced calls via Ribbon and Feign.
