This article walks through building a real‑time push system with Spring Boot by integrating WebSocket and MQTT, covering the protocol basics, Maven setup, configuration classes, server implementation, controller endpoints, front‑end testing page, common pitfalls, and deployment tips.
This article explains how Spring Boot versions up to 2.3.0.RELEASE normalize URLs containing the %2e sequence, causing servlet path handling that can be exploited to bypass authentication, and shows why the behavior changes in later releases.
This tutorial walks through setting up Spring Boot 2.3.8 with Spring Cloud Hoxton, adding OpenFeign dependencies, configuring service URLs, customizing Feign client defaults, enabling logging, setting request timeouts, and integrating Hystrix circuit breaker with fallbacks and factories.
This tutorial walks through setting up iText dependencies, creating a Word‑based PDF template, configuring Adobe Acrobat form fields, and implementing a Spring Boot utility class and endpoint to generate and download customized PDF documents with embedded images.
Spring Boot 2.5.0 introduces Java 16, Gradle 7, Jetty 10 support, enhanced Docker image building, dark‑mode docs, numerous configuration improvements, updated dependency versions, and several deprecations, providing developers with a richer, more modern backend framework.
This article explains how to integrate Redisson into a Spring Boot application to implement various Redis‑based distributed synchronization primitives—including re‑entrant locks, read‑write locks, and semaphores—while covering configuration, code examples, the watchdog mechanism, and practical testing procedures.
Spring Boot 2.5.0 (alongside 2.4.6 and 2.3.11) introduces Java 16 support, Gradle 7 compatibility, enhanced Docker image building, a new datasource loading mechanism, dark‑mode documentation, and several important configuration and security changes for backend developers.
This article compiles essential Spring Boot interview questions, covering its definition, benefits, core configuration files, starter modules, auto‑configuration, embedded containers, actuator monitoring, security concerns, exception handling, differences from Spring MVC, and integration with tools like ELK and Docker.
This article provides a complete tutorial for building a food‑delivery system with a mobile app, backend management, and API, detailing the technology stack, module structure, database setup, code snippets, and step‑by‑step instructions to launch both the admin and mobile front‑ends.
This article explains what ThreadLocal is, demonstrates how it works with and without it, analyses its source code, discusses potential memory‑leak issues, and provides best‑practice guidelines and a Spring‑Boot example for safe usage in multithreaded Java applications.
This article examines the architecture and features of Spring Cloud Config and Ctrip Apollo configuration centers, compares their strengths and weaknesses, and provides practical guidance for migrating from Spring Cloud Config to Apollo in microservice environments.
This guide walks through configuring Spring Boot 2.3.10 with OAuth2 client support, detailing required dependencies, application and security settings, common session‑related errors, step‑by‑step debugging of OAuth2LoginAuthenticationFilter and OAuth2AuthorizationRequestRedirectFilter, and the final solution of aligning hostnames to preserve cookies.
This article demonstrates how to configure and use Spring Boot's ThreadPoolTaskExecutor for asynchronous processing, shows custom thread‑pool monitoring, and provides complete code snippets and log examples to help improve batch‑insert performance in Java backend applications.
This guide demonstrates how to integrate Spring Boot with the Activiti workflow engine, covering common operations such as querying owner tasks, retrieving assigned tasks, suspending, activating, and deleting process instances, complete with controller examples and sample API calls.
This guide explains how to configure and use Activiti's TaskRuntimeEventListeners and ProcessRuntimeEventListeners in a Spring Boot application, covering TaskAssignedEvent, TaskCompletedEvent, and ProcessCompletedEvent with code examples, testing steps, and important authentication settings.
This tutorial demonstrates how to extend a Spring Boot application with Activiti to query historic process data, configure a diagram generator bean, compute highlighted flows, expose a REST endpoint for real-time process diagram rendering, and verify the workflow through a series of API calls and screenshots.
BRCC (Better Remote Config Center) is an open‑source, lightweight, Spring‑Boot‑based distributed configuration center that simplifies management of dynamic, multi‑environment settings across dozens of instances by offering easy SDK/API access, push notifications, traceability, fine‑grained security, high performance, and a user‑friendly UI.
This article provides a step‑by‑step guide on integrating the open‑source Dataway tool with a Spring Boot application, covering dependency inclusion, configuration of Dataway and data sources, module setup, enabling Hasor, and creating and testing API endpoints without writing custom code.
Explore the key features, strengths, and trade‑offs of the three leading Java microservice frameworks—Spring Boot, Dropwizard, and Micronaut—to help you choose the right tool for building fast, lightweight, and scalable services in modern cloud environments.
This article outlines the planning, design, and Java implementation of a distributed load‑testing framework called FunTester, focusing on two test‑case schemes (case transmission and execution), an HttpRequestBase‑based demo, case creation, transmission, execution, and the complete FunRequest class code.
This article presents a complete food‑delivery system with mobile, admin, and API modules, detailing its Spring Boot and Vue.js technology stack, module structure, database setup, quick‑start commands, and how to run both the management console and mobile client for learning purposes.
This article explains how, in a Spring Boot 2.2.13 environment with ShardingSphere 4.0.1, enabling data encryption causes the expected ShardingDataSource bean not to be created, walks through the configuration and source code analysis, and provides a custom bean solution to resolve the issue.
This article explains the dangers of using the kill -9 command on Java services, illustrates how it can cause data loss, and presents several graceful shutdown techniques for Spring Boot—including SIGTERM, Actuator endpoints, custom Tomcat shutdown hooks, and @PreDestroy backups—complete with code examples and screenshots.
This article explains how to replace repetitive try‑catch blocks in Spring Boot applications with a unified global exception handling solution by defining a standard AjaxResult response, a custom BusinessException, an error enumeration, and a @RestControllerAdvice handler, enabling clean, extensible error management.
This article provides a step‑by‑step tutorial on building a Spring Boot project, covering project generation, core starters, automatic Redis configuration, common annotations like @SpringBootApplication and @ControllerAdvice, web container and HTTPS settings, profile management, CORS, MVC interceptors, AOP, MyBatis‑Druid integration, mail sending, and Swagger API documentation.
This guide explains why Spring Boot 2’s OAuth2 authorization code flow skips the user‑approval page, walks through the relevant source code, and shows how to customize the confirmation and login pages, configure controllers and security settings, and verify the changes with tests.
This guide explains why Spring Boot’s default @ControllerAdvice cannot catch servlet‑level errors, introduces the ErrorPageFilter mechanism, and shows how to replace the BasicErrorController with a custom ExceptionController that rethrows errors for unified handling across the application.
This guide demonstrates how to integrate Spring Boot 2 with OAuth2 to build a protected resource server, configure Redis for token storage, define domain and security classes, and test the secured endpoints, complete with code snippets and visual verification steps.
This tutorial walks through setting up a Spring Boot 2.2.11 OAuth2 authorization server that stores tokens in Redis, covering Maven dependencies, YAML configuration, JPA entities, DAO interfaces, core server configuration, custom client details, authentication provider, password encoder, and detailed testing of all OAuth2 grant types.
This article explains how to create a reusable backend foundation for new Spring Boot projects by assembling common utilities such as Swagger API documentation, MyBatis‑Plus code generation, unified response objects, pagination helpers, custom exception handling, multi‑environment Maven and Spring profiles, logback configuration, and a Jenkins pipeline.
This article explains unit testing concepts, introduces TestNG and PowerMock frameworks for Spring Boot, details common annotations, provides Maven dependency snippets and comprehensive Java test examples, and demonstrates advanced mocking techniques, parameterized tests, and assertion strategies to improve code reliability and coverage.
This tutorial explains how to upgrade to Alipay's new transfer API alipay.fund.trans.uni.transfer, update the SDK, configure certificates and properties, and implement Spring Boot components and utility classes for secure backend payment integration.
This article investigates how Spring Boot’s connectionTimeout parameter behaves by conducting three experiments—controller‑side delay, HttpURLConnection requests, and raw socket connections—revealing that the timeout only applies after a client establishes a connection and remains idle, not to the overall request processing time.
This tutorial walks you through setting up ElasticSearch, Kibana, and Logstash, configuring them for a Spring Boot application, and using Kibana to explore indexed logs, providing code snippets, configuration files, and visual instructions for a complete ELK integration.
This tutorial walks through configuring Spring Boot 2.3.10 with Elasticsearch 7.8, defining Maven dependencies, setting up application properties, creating a searchable Product model, implementing a repository with derived query methods and custom @Query annotations, and testing CRUD and advanced search operations using both repository and RestTemplate approaches.
This article explains how to package a Spring Boot application using Maven's assembly plugin, configure environment-specific profiles, and deploy the resulting zip with a custom shell script that supports start, stop, restart, and unzip operations on Linux.
This tutorial demonstrates how to configure Spring Boot 2.3 with Elasticsearch 7.8, covering required Maven dependencies, creating a high‑level REST client, and providing complete Java examples for index management, document CRUD, bulk operations, and a variety of advanced search techniques including pagination, sorting, filtering, range, highlighting, aggregations, and grouping.
This article demonstrates how to create a custom @AccessLimit annotation, implement a Spring Boot interceptor that uses Redis to track request counts, register the interceptor, and apply the annotation to controller methods for fine‑grained rate limiting.
This article provides a step‑by‑step tutorial on building a Spring Boot project and configuring essential features such as starters, configuration properties, profiles, global exception handling, CORS, MVC interceptors, AOP, MyBatis‑Druid integration, Redis caching, email sending, and Swagger API documentation, complete with code examples and best‑practice tips.
Learn five practical ways to gracefully shut down a Spring Boot application—including using Actuator’s shutdown endpoint, closing the application context, PID file handling, SpringApplication.exit, and a custom shutdown controller—so unfinished tasks finish, logs flush, and services stop safely without resorting to kill‑9.
This article explains how the @SpringBootApplication annotation combines @Configuration, @EnableAutoConfiguration, and @ComponentScan, walks through the SpringApplication.run execution flow, and reveals the inner workings of Spring Boot’s auto‑configuration mechanism using SpringFactoriesLoader and META‑INF/spring.factories.
Spring Boot 2.5 introduces secure info endpoints, graceful shutdown via GET, shutdown logging, a new Quartz actuator endpoint, layered WAR support, Buildpack image building, environment variable prefixes, enhanced metrics, HTTP/2 over TCP (h2c), and several datasource improvements, all aimed at smoother microservice development.
This comprehensive guide walks you through MyBatis-Plus fundamentals, non‑intrusive features, quick project setup, CRUD operations, automatic field filling, optimistic and logical locking, powerful wrapper queries, pagination, and the built‑in code generator, all illustrated with runnable examples and code snippets.
This guide explains RabbitMQ dead-letter queues, detailing the conditions that cause messages to become dead letters, how to configure exchanges and queues with x-dead-letter parameters, and demonstrates three testing methods—reject/nack, TTL expiration, and max-length overflow—using Spring Boot code examples.
This article explains how to break down large Spring Boot fat JARs into a small business JAR and a shared lib directory, covering four optimization levels for single‑module and multi‑module microservice projects, and demonstrates Maven configurations that shrink deployment packages from hundreds of megabytes to a few hundred kilobytes.
This article explains how to improve Spring Cloud microservice performance by adding local and Redis distributed caching, demonstrates the necessary code changes, and discusses cache pitfalls such as penetration, avalanche, and breakdown along with lock‑based solutions.
This article explains the fundamentals of JSON Web Tokens (JWT), their structure, main use cases, and provides a step‑by‑step guide for integrating JWT authentication into a Spring Boot application, including dependency setup, custom annotations, token generation, interceptor implementation, and configuration details.
This article provides a comprehensive step‑by‑step tutorial on designing, implementing, and deploying a simple Java Spring Boot microservice system on Kubernetes, covering architecture design, registration center, monitoring with Prometheus and Grafana, logging, tracing, flow control, and verification using tools such as Zipkin and Sentinel.
This article explains how Spring Boot's spring-boot-maven-plugin creates an executable fat JAR, details its internal structure, the purpose of the JarLauncher class, and the custom class loading mechanisms used to launch the application, including code examples and manifest analysis.
This article provides a comprehensive guide to the most essential Spring Boot annotations, explaining their purpose, usage, and code examples, helping developers configure beans, enable auto‑configuration, and control application behavior effectively.
This article walks through step‑by‑step how to add Dataway—a DataQL‑based API configuration tool—to a Spring Boot application, covering Maven dependencies, property settings, datasource integration, Hasor module setup, enabling Hasor, and using the UI to create and publish SQL or DataQL endpoints without writing custom code.
This article summarizes the latest Spring Boot 2.4.5 and 2.3.10 releases, detailing dozens of bug fixes, documentation improvements, and a comprehensive list of upgraded dependencies, providing developers with a clear view of the enhancements and migration considerations for each version.
This tutorial walks through building a scalable like feature using Spring Cloud, Redis caching, MySQL persistence, and Quartz scheduling, covering Redis installation, Spring Boot integration, data modeling, service implementation, and periodic synchronization of high‑frequency like operations to the database.
This article explains how the Linux kill -9 command can cause data loss and service instability, demonstrates safer alternatives such as kill -15 and Spring Boot's built‑in shutdown mechanisms, and provides code examples for implementing graceful termination, custom shutdown hooks, and pre‑destroy data backup in Java backend services.
This tutorial demonstrates how to configure Spring Boot with MyBatis, create a custom TypeHandler that encrypts and decrypts database fields using AES, and integrate the handler in entity mappings and mapper XML for seamless data protection.
This article explains how Spring Boot, a Pivotal‑backed extension of the Spring framework, simplifies Java backend development by providing auto‑configuration, starter dependencies, embedded servers, and seamless integration with micro‑service architectures, while also covering core annotations, configuration files, security, and deployment options.
This comprehensive guide explains what Spring Boot is, why it was created for micro‑service development, how it simplifies configuration with starters and auto‑configuration, and provides detailed coverage of core annotations, configuration files, security, CORS, transaction management, and deployment options for Java backend developers.
This tutorial explains how to transparently encrypt and decrypt sensitive fields such as ID numbers, phone numbers, and real names in a Spring Boot application by leveraging MyBatis plugins, custom annotations, and interceptor implementations for both input and output data.
This article provides a comprehensive, step‑by‑step tutorial on how to integrate Dataway—a DataQL‑based API configuration tool—into a Spring Boot application using Hasor, covering dependency setup, configuration, datasource integration, module loading, enabling Hasor, launching the app, and creating and testing APIs through the built‑in UI.
This tutorial demonstrates how to integrate Elasticsearch into a Spring Boot microservice, covering component selection, Maven configuration, client setup, index creation, data insertion, complex query execution, synchronization of question data, and front‑end search handling, all illustrated with complete Java code examples.
This article explains how to configure Spring Boot 2.2.11's remember‑me feature using a persistent token repository, customize HttpSecurity, create the required database schema, and understand the underlying authentication flow through detailed code snippets and step‑by‑step analysis.
This article provides a step‑by‑step guide for using MyBatis‑Plus with Spring Boot, covering database and table creation, entity and mapper definitions, CRUD examples, automatic field filling, optimistic and logical deletion, performance plugins, query wrappers, and a code generator for rapid development.
This guide walks through configuring Spring Boot 2.3.9 with Spring Cloud Hoxton to register services in Zookeeper, set up provider and consumer applications, and achieve client‑side load balancing using Spring Cloud LoadBalancer.
This article walks through what Redis is, its data types, caching usage with Spring Boot, performance advantages, eviction policies, persistence mechanisms, master‑slave replication, Sentinel high‑availability, and practical interview‑style Q&A, providing a comprehensive guide for backend developers.
This article explains how to integrate Swagger using Springfox 3.0.0 into a Spring Boot project, covering required dependencies, configuration files, annotations, new features, compatibility requirements, and provides a complete example with code snippets for generating interactive OpenAPI documentation.
This guide walks through integrating RocketMQ 4.8.0 with Spring Boot 2.3.9, covering dependencies, configuration, code examples for normal, ordered, cluster/broadcast, and transactional messages, and demonstrates testing results with detailed explanations of each messaging mode.
This guide explains what CSRF attacks are, outlines common defense strategies such as captchas, referer checks, and token validation, and provides a complete Spring Boot implementation—including custom annotations, token storage with Guava or Redis, an interceptor, configuration, and a token‑generation endpoint—complete with testing steps.
This article explains how to use GitHub Actions to automatically publish a Spring Boot payment library to Maven Central, covering required OSSRH and GPG credentials, Maven POM configuration, secret management, and a complete workflow YAML that triggers on a GitHub release.
This guide walks through installing RocketMQ 4.5.1, launching NameServer and broker, testing with sample producer/consumer scripts, explains core components and console setup, shows Spring Boot starter integration with example code, and demonstrates sending normal, ordered, and transactional messages.
This article walks you through setting up the Erupt Java annotation‑based framework, configuring Maven dependencies and datasource, launching a ready‑made admin UI, customizing pages with @Erupt annotations, and extending functionality via data proxies, all without writing front‑end code.
This article explains the concept of max‑effort notification, contrasts it with reliable messaging, and provides a complete Spring Boot 2.4.9 and RabbitMQ 3.7.4 implementation—including project structure, configuration, entity models, repositories, services, controllers, and message listeners—plus testing steps and results.
When migrating Spring Boot services to Spring Cloud on servers with constrained memory, understanding the JVM's default heap configuration and applying explicit -Xms and -Xmx parameters, along with using built‑in Java tools to inspect and tune runtime memory, can prevent out‑of‑memory failures.
This article walks through the design, core components, task states, API endpoints, and full Java implementation of a Redis-powered delay queue using Spring Boot, complete with code samples, container structures, timer processing, and testing procedures.
This article explains the concept of idempotency, why it is essential for HTTP interfaces, the impact on system design, and presents several practical implementation strategies—including unique primary keys, optimistic locking, anti‑repeat tokens, and downstream sequence numbers—accompanied by a complete Spring Boot example with Redis integration and test code.
This tutorial explains RocketMQ's architecture—including producers, brokers, consumers, topics, tags, and consumption models—then walks through installing the service, configuring the environment, and integrating it with Spring Boot using Maven dependencies, YAML settings, and sample producer and consumer code.
Learn how Spring Boot’s @Enable* annotations work, explore the role of @Import, and follow a step‑by‑step example that defines a custom @EnablePack annotation, implements ImportAware, and demonstrates its usage in a Spring Boot application.
This article provides a step‑by‑step tutorial on designing a simple front‑back separation microservice system, implementing it with Java Spring Boot, and deploying the whole solution on a Kubernetes cluster with high‑availability features, monitoring, logging, tracing, and traffic control.
This guide explains why a unified exception handling mechanism is essential in Spring Boot applications and provides step‑by‑step code examples for creating a standard response class, custom exception types, an error enumeration, and a @RestControllerAdvice‑based global handler, complete with test screenshots.
This guide walks through setting up a Spring Boot 2.2.11 project with Activiti 7.1, configuring Maven dependencies, explaining Activiti table prefixes, defining core services, creating a BPMN leave request process, configuring security and datasource, and exposing REST APIs for deployment, execution, and task handling.
This article provides a detailed overview of the latest Spring Boot 2.4.4 and Spring Cloud 2020.0.2 releases, highlighting key module upgrades, bug fixes, documentation improvements, and dependency updates, helping developers understand the enhancements and how to integrate them into their Java applications.
This article explains how to replace repetitive try‑catch blocks in Spring Boot with a unified global exception handler, introducing a standard AjaxResult wrapper, custom BusinessException, an error enumeration, and a @RestControllerAdvice that returns consistent JSON error responses across the application.
This article explains how to implement database read‑write splitting in a Spring Boot application by configuring master and slave data sources, creating a dynamic routing datasource, using a ThreadLocal context holder, defining a custom annotation with AOP for automatic switching, and demonstrates usage with sample code.
This article introduces SOFABoot, an open‑source framework built on Spring Boot that adds readiness checks, classloader isolation, log space isolation, seamless SOFA middleware integration, modular development support, and provides a starter‑based programming model for large‑scale microservice architectures.
Spring Boot 2.4.4 has been released, offering 60 bug fixes, enhancements, documentation updates, and dependency upgrades, including fixes for jOOQ NPE, schema path errors, @ConfigurationProperties injection, EmbeddedDatabaseConnection issues, RSocket server initialization, and various Actuator and devtools problems.
This article outlines five Spring-based approaches for using Apache RocketMQ—including Spring Messaging, Spring Cloud Stream, Spring Cloud Bus, Spring Cloud Data Flow, and Spring Cloud Function—detailing each project's features, typical use cases, and how they fit into modern Java microservice architectures.
This article explores five integration approaches for using Apache RocketMQ within the Spring ecosystem, detailing each project's features, typical use cases, and how they complement Spring Boot, Spring Messaging, and Spring Cloud Stream for building robust, scalable microservices.
This article explains how to implement delayed message delivery in RabbitMQ using the delayed‑message‑exchange plugin and Spring Boot, covering the shortcomings of traditional approaches, configuration of exchanges and queues, sending messages with delay headers, and a test demonstrating a 6‑second delayed receipt.
This guide introduces the Java‑based Geotools library, explains how to set up a Spring Boot project with Maven dependencies, and walks through a complete quickstart example that loads a shapefile, renders it with a map frame, and clarifies the required .shp, .shx, and .dbf components.
This article explains why traditional approaches like Redis expiration, database polling, or JVM DelayQueue are inefficient for delayed messaging, and demonstrates how to use RabbitMQ's delayed‑message‑exchange plugin with Spring Boot to create, configure, send, and consume delayed messages, including full code examples and a test showing a 6‑second delay.
The Spring Native beta release lets developers compile Spring applications into GraalVM native images via start.spring.io, offering near‑instant startup, peak performance, and lower memory usage while outlining usage, collaboration, supported scope, AOT transformation, and future roadmap.
This article introduces the Forest HTTP client framework, showing how it abstracts diverse third‑party API differences through configuration and annotations, provides easy Spring Boot integration, and offers powerful features like template expressions, HTTPS support, and extensive request customization.
This guide walks through adding the WebSocket starter to a Spring Boot service, configuring a WebSocketConfig class, implementing client and service components, adjusting Nacos gateway rules, testing with a WebSocket client tool, and exposing a REST endpoint to push messages to Vue front‑ends.
This tutorial walks through upgrading a Spring Boot 2.x project to Java 11, updating dependencies such as MyBatis and MySQL connector, configuring the Baidu UID generator database schema, adjusting MySQL settings, and building a uid‑provider microservice with full Maven and code examples.
This article explains why database passwords should be encrypted, introduces Alibaba's Druid as a simple solution for Java Spring Boot projects, and provides step‑by‑step instructions—including generating ciphertext with ConfigTools, configuring application.yml, and securely handling public keys—to protect MySQL credentials.
This tutorial explains how to replace the default Swagger UI with Swagger‑Bootstrap‑UI (now called Knife4j) in a Spring Boot application, covering Maven dependencies, configuration classes, common annotations, a sample controller, launch steps, and troubleshooting tips.
This article provides a comprehensive tutorial on setting up Spring Boot application monitoring using Prometheus and Grafana, covering project creation, dependency configuration, security setup, Prometheus server installation, Grafana dashboard creation, email alerting configuration, and testing the end‑to‑end alert workflow.
This article evaluates three ways to insert records into a SQL Server database—repeated single inserts, XML‑based SQL concatenation, and batch processing—under a Spring Boot environment, providing code examples, performance test results, and practical recommendations for different data volumes.
This tutorial walks you through upgrading Spring Boot, introduces MongoDB basics, and provides a hands‑by‑step guide to adding the spring‑boot‑starter‑data‑mongodb dependency, defining entity and repository classes, writing unit tests, and configuring connection properties for robust backend data management.
This article explains how to use the javax.validation (JSR‑303) annotation‑based validation framework in Spring Boot to replace verbose manual checks, covering built‑in constraints, Maven dependencies, DTO annotations, custom validators, validation groups, global exception handling, and practical RESTful examples.
This article introduces the Mica framework, explains its origin and naming, details the latest version releases and cumulative updates for the 2.4.x and 2.1.x branches, and describes new modules such as mica-logging and mica-caffeine along with ecosystem links.
