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.
This article explains how to protect API data exchange by using access tokens, timestamps, MD5 signatures, Redis caching, and a custom @NotRepeatSubmit annotation to prevent replay attacks and duplicate submissions in a Spring Boot backend.
The article presents eladmin, a fully open‑source, front‑back separated admin platform built with Spring Boot, JPA, Spring Security, Redis and Vue, detailing its features, modular architecture, code‑generation capabilities, and highlights that make it a valuable learning resource for developers.
This article curates a selection of high‑quality open‑source Spring Boot admin systems—including SmartAdmin, litemall, Timo, mall4j, web‑flash, and SPTools—detailing their key features, technology stacks, and repository links to help developers quickly adopt robust backend management solutions.
SOFABoot, an Ant Financial open‑source framework built on Spring Boot, enhances microservice development by adding readiness checks, class and log space isolation, unified middleware integration, and modular development capabilities, addressing class conflicts and monitoring challenges in large‑scale deployments.
This article walks through creating a WebSSH solution from scratch using Spring Boot, WebSocket, JSch and the xterm.js front‑end library, covering dependency setup, backend WebSocket configuration, message handling, SSH session management, and a minimal HTML/JS client to display a browser‑based terminal.
Netflix’s Domain Graph Service (DGS) framework, now open‑sourced, provides a Spring Boot‑based, annotation‑driven solution for building both standalone and federated GraphQL services, offering schema‑first and code‑first development, code generation, testing tools, and seamless integration with Netflix’s tracing and security infrastructure.
This article explains the dangers of using the Linux kill -9 command for terminating processes, illustrates how abrupt termination can cause data inconsistency in transactional systems, and provides step‑by‑step methods—including Spring Boot actuator, custom Tomcat shutdown, and @PreDestroy hooks—to achieve graceful service shutdown.
This article explains the fundamentals of unit testing in Spring Boot, covering the purpose of unit tests, how to add the spring-boot-starter-test dependency, the role of MockMvc for controller testing, step‑by‑step creation of Service and Controller test classes, key annotations, assertion techniques, and a brief comparison with Postman.
This article explains how Spring 5.0 reads configuration and annotations, manages bean lifecycles, utilizes BeanPostProcessor extensions, addresses key issues such as FactoryBean vs BeanFactory and circular dependencies, and provides sample code to demonstrate these concepts.
This article walks through the design and implementation of a Java RPC framework, detailing added serialization options, multiple load‑balancing strategies, client‑side service caching, TCP long‑connection handling with Netty, performance testing, and provides the full source code for replication.
This article provides a comprehensive guide to using Jackson with Spring Boot, covering its core modules, Maven dependencies, ObjectMapper usage, JSON tree model, custom deserializers, XML handling, configuration options, and practical code examples for serialization and deserialization.
Learn how to quickly set up a GraphQL API using Netflix's open‑source DGS framework in a Spring Boot project, covering Maven dependencies, schema definition, data fetcher implementation, UI debugging with GraphiQL, and example curl and Java test calls.
This tutorial walks through creating a Spring Boot project, configuring Maven dependencies, setting up MySQL with MyBatis, defining entity, mapper, service, and controller layers, and building simple Thymeleaf login and registration pages, culminating in a runnable dynamic authentication demo.
After migrating a project to the MDP framework based on Spring Boot, the system repeatedly reported excessive swap usage; the investigation revealed that native memory allocated by the Spring Boot classloader’s Reflections scanning and InflaterInputStream caused 700 MB–800 MB of off‑heap memory to remain unreleased, which was eventually resolved by limiting the scan path and updating Spring Boot.
This article explains how Spring Boot’s auto‑configuration works, introduces the most frequently used annotations such as @Value, @ConfigurationProperties, @Import and @Conditional, and provides practical code examples to illustrate the underlying mechanisms and startup process of a Spring Boot application.
Spring Boot 2.4.3, released on the first workday of the new year, brings 29 bug fixes, 15 documentation improvements, and 31 dependency upgrades—including critical fixes for DataSourceBuilder, Amazon Redshift driver detection, JPA lazy repositories, and Spring Data Solr—while the full changelog is available on GitHub.
This article explains how Spring Boot's spring-boot-maven-plugin creates an executable JAR, describes the internal JAR structure, the function of the JarLauncher class, and details the custom class loader mechanisms that enable Spring Boot applications to run directly with java -jar.
Spring Boot 2.4.3, the third patch of the 2.4 line, introduces 75 bug fixes, enhancements, documentation updates, and dependency upgrades, including UTF‑8 logging defaults, Neo4j/MongoDB startup fixes, Redshift driver recognition, and numerous improvements to testing, security, and monitoring components.
This article introduces a behavior‑based captcha solution that replaces traditional text captchas with slide‑puzzle and click‑word challenges, explains its terminology, interaction flow, project directory layout, and provides online demo links for both web and mobile implementations.
This tutorial walks through setting up Spring Authorization Server on Spring Boot 2.4.2, covering Maven dependencies, custom bean configuration, token generation, testing with curl commands, and token customization options, providing a complete example for OAuth2 authorization implementation.
TLog provides a non‑intrusive, zero‑storage solution for tracing logs across microservices by automatically tagging log entries with a TraceId, supporting major Java logging frameworks and RPC libraries, and can be integrated into a Spring Boot project in just a few minutes.
This article investigates the often‑confused concepts of asynchronous request and asynchronous call in Spring Boot, explains how they differ in purpose and behavior, shows how to locate reliable definitions through English sources, and demonstrates the distinction with code examples.
This article describes a series of improvements to a Spring‑Boot based Java RPC framework—including support for Protobuf and Kryo serialization, multiple load‑balancing algorithms, client‑side service caching, TCP long‑connection reuse via Netty, and a performance test that reduces request latency by more than tenfold.
This article explains why Spring MVC controllers are singleton by default, demonstrates the thread‑safety issues caused by non‑static member variables, shows how applying @Scope("prototype") changes behavior, and summarizes the five Spring bean scopes with practical recommendations.
This article explains the fundamentals of asynchronous programming and multithreading, compares their models with clear examples, discusses callbacks, highlights performance trade‑offs, and offers guidance on choosing the right approach for I/O‑heavy Java applications.
This tutorial explains how to embed Dataway—a UI‑driven API configuration tool based on Hasor—into a Spring Boot application, covering dependency inclusion, Dataway property setup, datasource configuration, Hasor module wiring, enabling annotations, launching the service, and creating and publishing APIs without writing any Java code.
This article introduces kk-anti-reptile, a Spring Boot‑based anti‑crawler filter that uses Redis, implements ip‑rule and ua‑rule, returns HTTP 509 with various captchas, and provides step‑by‑step Maven, configuration, and Axios front‑end integration instructions.
This tutorial explains how to create a custom @AccessLimit annotation, an interceptor that uses Redis to count requests, register the interceptor in Spring Boot, and apply the annotation to controller methods to enforce per‑endpoint rate limiting.
This article explains how to achieve database read‑write separation in high‑concurrency Java applications by configuring master‑slave data sources, implementing a routing data source, managing context with ThreadLocal, defining a custom @DataSourceSwitcher annotation, and applying AOP to dynamically switch between read and write databases.
This article explains how to achieve read‑write separation in high‑concurrency Java applications by configuring master‑slave data sources, routing with AbstractRoutingDataSource, managing context via ThreadLocal, defining a custom @DataSourceSwitcher annotation, and applying AOP to switch databases at runtime.
The article presents Netflix’s open‑source Domain Graph Service (DGS) framework, detailing its purpose, core features, schema‑first development approach, practical usage examples, integration with the GraphQL ecosystem, support for federation, modular architecture, distributed tracing, and how developers can get started with the project.
This article walks through the step‑by‑step investigation of an unexpected ~100 ms latency in a Spring Boot channel service, using network checks, curl timing, Arthas trace and watch commands to pinpoint a Tomcat‑embed bug caused by Swagger‑UI JAR loading, and then shows how upgrading Tomcat resolves the issue.
After upgrading an internal framework, a company’s UAT environment saw throughput drop from 53.9/s to 6.4/s due to abnormal Feign latency, prompting a deep dive with Arthas profiling, code tracing, and class‑loader analysis that uncovered costly JodaModule loading and class‑loader overhead, leading to targeted fixes that restored and even improved performance.
This article compares several Java microservice frameworks—including Spring Cloud, Vert.x, SparkJava, Micronaut, Javalin, and Quarkus—by describing their features, required infrastructure, and performance results from 30‑second stress tests, while also noting resource consumption and startup times.
This guide explains how to achieve transactional consistency across multiple databases in a Spring Boot application by integrating JTA with Atomikos, covering configuration, code implementation, testing, and verification of distributed transactions using multi‑data‑source setups.
