This article introduces Apache POI, the Java API for Microsoft Office documents, explains its core components such as Workbook, Sheet, Row, and Cell, and provides detailed code examples for creating, reading, and converting Java object lists to Excel files, including Maven dependencies and annotation usage.
This guide explains how to set up Alibaba's open‑source Java diagnostic tool Arthas using four methods—running the jar locally, accessing the Web Console, adding it as a Maven dependency, and deploying via Docker—so developers can quickly troubleshoot bugs in production environments.
This article compares IntelliJ IDEA and Eclipse project structures, explains the role of .classpath, .project, and .settings files, demonstrates how Maven standardizes builds across IDEs, and provides step‑by‑step guidance for creating and importing Maven projects in both environments.
This article explains the drawbacks of Maven, introduces Gradle as a modern Java build tool, and provides step‑by‑step guidance on installing Gradle, using the Gradle wrapper, managing dependencies, configuring mirrors and proxies, and highlights Gradle’s speed, flexibility, and concise DSL compared to Maven.
This article explains the purpose of the mvnw and mvnw.cmd wrapper scripts generated by Spring Initializr, detailing how they check for Maven, Java, and version compatibility, and how to run them to build a Spring Boot project on Windows and Linux.
This guide explains why multiple Netty jar versions cause runtime errors, shows how to use the Arthas tool to inspect loaded classes and methods, and provides Maven commands and pom.xml techniques to locate and eliminate version conflicts in Java backend projects.
This article introduces MapStruct, explains why traditional JavaBean conversion methods like reflection are inefficient, shows how to set up Maven dependencies, define entities and DTOs, write mapper interfaces, run tests, and highlights the performance, debugging, simplicity, and dependency‑free advantages of the generated code.
This article introduces MapStruct, a type‑safe, high‑performance, dependency‑free Java bean mapping annotation processor, explains the problems with manual and reflection‑based conversions, provides step‑by‑step Maven setup, entity/DTO definitions, mapper interface, and a JUnit test, and discusses its performance, debugging, and simplicity advantages.
This article provides a detailed, step‑by‑step guide to Maven, covering why to use it, its core concepts, installation, project structure, pom.xml coordinates, dependency scopes, lifecycle phases, advanced features like transitive dependencies, build configuration, and how to integrate Maven with Eclipse for Java development.
This guide explains how Flyway automates database schema migrations using version‑controlled SQL scripts, covering its core concepts, naming conventions, command‑line usage, Maven integration, and seamless Spring Boot configuration to keep databases in sync with application releases.
Payment Spring Boot is a lightweight Java library that implements WeChat Pay V3 for Spring Boot applications, offering easy configuration, multi‑merchant support, Alipay integration, and features such as basic payments, combined orders, vouchers, PayScore, and pre‑enjoy cards, with Maven coordinates and a changelog provided.
The BeetlSQL 3.1.5 update resolves two persistent bugs related to @Version and @LogicDelete annotations, provides the Maven dependency snippet, and outlines its broad support for traditional databases, big‑data stores, IoT time‑series databases, SQL query engines, and in‑memory databases.
Faced with network latency and only a Docker container available, this guide compares two practical ways to run Groovy test scripts—packaging the test class into a JAR and invoking its main method, or using a reflection utility to call methods dynamically—complete with code samples, Maven commands, and execution results.
This article explains how to integrate JUnit unit testing into Jenkins pipelines using Maven and Spring Boot, covering project setup, dependency configuration, test case creation, Jenkins job configuration, and result reporting to achieve fully automated testing in a DevOps workflow.
This article provides a detailed overview of Maven, covering its purpose, project structure, build lifecycle phases, dependency coordinates and scopes, repository types, plugin mechanisms, aggregation and inheritance, as well as flexible configuration using properties and profiles, all illustrated with practical code examples.
This article introduces Kotlin’s growing role in backend development, explains its interoperability with Java, and walks through creating a Spring Boot microservice using Kotlin, including project setup with Spring Initializr, Maven configuration, and sample code for a simple web endpoint, illustrating the benefits of concise Kotlin syntax.
This article introduces Kotlin for backend development, explains why Kotlin works well with Spring Boot, and provides a step‑by‑step tutorial—including Maven setup, essential dependencies, and sample Kotlin code—to create a simple Spring Boot web application.
This guide explains how misusing Maven's optional and scope elements can bloat JAR/WAR files and slow compilation, and shows practical configurations—including code examples and dependency inheritance scenarios—to reduce artifact size, improve build speed, and avoid version conflicts.
This article introduces Kotlin for backend development, explains its advantages over Java, and provides a hands‑on tutorial with Maven configuration, source code, and deployment steps to create a simple Spring Boot web service using Kotlin.
This article details the evolution of Ctrip's Shark multilingual platform, describing how caching strategies and file redundancy were introduced to reduce database load, improve response times, and enhance overall system stability for a large-scale internationalized service.
This article compares Spring and Spring Boot, explaining their fundamental concepts, Maven dependencies, MVC and security configurations, template engine setup, startup mechanisms, and packaging options, while providing practical code examples to help Java developers choose and migrate between the two frameworks.
This article walks you through setting up Jenkins to clone a Spring Boot project from Gitee, configure JDK, Git, and Maven tools, create a freestyle job with parameterized builds, write shell scripts for stopping and starting the application, and troubleshoot common issues for a fully automated CI/CD pipeline.
This tutorial walks through preparing the environment, configuring Docker remote access, creating a Spring Boot project in IntelliJ IDEA, setting up Maven and Docker files, building the image, and running the container, demonstrating a complete end‑to‑end Java microservice deployment with Docker.
This guide explains the drawbacks of Maven, the advantages of Gradle, how to install Gradle via binaries or package managers, use the Gradle wrapper, manage dependencies with concise scopes, configure mirrors and proxies, and leverage Gradle's speed, flexibility, and simplicity for Java projects.
This article explains how to set up separate configuration files for development, testing, and production environments in Spring Boot, how to activate the desired profile via properties or command line, and how to use Maven profiles and resource filtering to package the application accordingly.
This guide walks you through packaging the Ruoyi microservice project with Maven, copying the resulting JAR files to a Windows server, running each service with the correct Java encoding, and configuring the front‑end proxy via vue.config.js or Nginx for full deployment.
This tutorial walks you through preparing the environment, installing Jenkins via Docker, configuring initial settings, integrating JDK, Maven, and Git, adding SSH servers and credentials, creating Maven jobs, and automating builds for Spring Boot applications on both GitHub and GitLab, including multi‑module project handling.
This article explains how to efficiently package Maven multi‑module projects by leveraging the -pl and -am command‑line options, showing dependency relationships, pom.xml configurations, and practical examples that reduce build time compared to packaging each module separately.
This article explains why using fastjson's Feature.OrderedField caused a NoSuchFieldError during unit tests, demonstrates two methods—Maven dependency tree and runtime class location—to pinpoint the conflicting JAR, and shows how switching to Gson resolved the issue.
This article explains why Maven is essential for Java projects, describes its lifecycle and standard directory layout, shows how to install and configure Maven, create a project in IntelliJ, manage dependencies, use plugins, build multi‑module projects, and package Spring Boot applications.
This guide explains how to restructure a Maven project to isolate unit and integration tests, configure Maven Surefire, Failsafe, Build‑Helper, and JaCoCo plugins for separate execution and combined coverage reports, and finally display the results in SonarQube.
This article explains the fundamental differences between Spring and Spring Boot, covering their core concepts, configuration methods, MVC setup, template engine integration, security configuration, bootstrapping mechanisms, and packaging/deployment options, with detailed code examples for each aspect.
This article explains why SpringBoot jars become large when packaged with many dependencies, and provides a step‑by‑step method—extracting the lib folder, adjusting the pom.xml to omit it, rebuilding, and running the slimmed jar with external libraries—to significantly shrink the final artifact and speed up deployment.
This comprehensive guide details IntelliJ IDEA configuration and productivity tips, covering Maven setup, code line width, case‑insensitive completion, forced Maven dependency refresh, file‑type exclusions, shortcut customizations, plugin installation, memory settings, JSON injection, presentation mode, and numerous other settings to streamline Java development.
This tutorial explains how to install Docker on CentOS, pull a Java base image, create and configure a Spring Boot project, write a Dockerfile, build the image with Maven, run the container with port mapping, and access both console and Log4j2 file logs.
This guide walks you through configuring Maven, customizing code style, enabling case‑insensitive completion, forcing Maven dependency updates, managing hidden files, remapping shortcuts, adjusting memory and encoding settings, using live templates, and leveraging presentation and inject‑language modes in IntelliJ IDEA to boost productivity.
This guide walks through the fundamentals of Spring Boot, explaining its purpose, showing how to create a project with Spring Initializr, writing a Hello World REST controller, understanding starter dependencies, configuring properties, exploring the main application class annotations, and adding a simple unit test.
This tutorial walks you through preparing the environment, configuring Docker remote access, setting up a Spring Boot project in IDEA, creating Dockerfiles and Maven settings, building the image, running the container, and verifying the deployment via browser and logs.
This tutorial walks through installing Docker, configuring remote access, creating a Spring Boot project, writing the necessary Dockerfile and Maven settings, building the image, and running the container, demonstrating how IDEA, Spring Boot, and Docker combine to simplify Java web deployment.
This guide explains why Spring Boot JARs become oversized when packed with many dependencies, demonstrates how to extract and reuse the lib folder, modify Maven settings to exclude embedded libraries, and run a much smaller JAR together with the external libs for efficient deployment.
This comprehensive guide details how to configure Maven, adjust code style settings, manage case‑sensitive completion, force Maven dependency updates, customize environment paths, hide files, modify keymaps, resolve CPU spikes, enable plugins, adjust memory, use presentation mode, inject language fragments, and resolve shortcut conflicts in IntelliJ IDEA, providing step‑by‑step instructions for each feature.
Hutool is a popular open‑source Java utility library that consolidates common JDK functions into easy‑to‑use modules, offers numerous components such as AOP, caching, cryptography, and HTTP, and can be added via Maven or Gradle to streamline development and reduce repetitive code.
This article explains the three primary ways to launch a Spring Boot application—running a class with a main method, using the java -jar command, and leveraging the spring-boot-maven-plugin—along with code examples, configuration details, and Maven command options.
This guide walks through the complete process of setting up a fault‑tolerant RocketMQ cluster on two Linux servers, covering environment preparation, Java installation, NameServer and Broker deployment, configuration of master‑slave modes, startup commands, troubleshooting, port opening, verification, and optional console installation.
Spring Cloud Hoxton Service Release 8 (SR8) is now available on Maven Central, supporting Spring Boot 2.3.x and 2.2.x, and introduces TLS support for Eureka and Config clients, enhanced Kubernetes load balancing, plus a comprehensive list of updated dependencies across the Spring Cloud ecosystem.
BeetlSQL provides a unified, high‑performance database access framework supporting traditional, big‑data, and time‑series databases, outlines its Maven dependency, and presents detailed M3‑phase performance benchmarks across various query methods and ORM tools.
This article walks through configuring Redisson with Maven, demonstrates a simple distributed lock example using Sentinel, lists the Redis commands and Lua script semantics involved, and provides a detailed source‑code analysis of the RLock interface, tryLock, unlock, and forceUnlock methods.
This article provides a step‑by‑step tutorial on deploying a Spark‑based advertising data pipeline using Kudu, covering Hadoop setup, HDFS data loading, Spark application refactoring, Maven packaging, Yarn execution, and crontab scheduling for daily automated runs.
This step-by-step tutorial explains how to prepare a CentOS environment, install Java and Maven, clone the Ratel source code, build the project, launch the command-line Dou Dizhu client, and play the game with various modes, providing all necessary commands and screenshots.
This guide walks through setting up a Maven project, adding Hadoop dependencies, configuring Kerberos (krb5.conf and keytab), loading core‑site.xml, and providing Java utility classes to initialize the HDFS client and list files in an HA‑enabled Hadoop cluster.
This guide explains why the default Maven central repository is slow in China, how to use Alibaba and other domestic mirrors, and provides step‑by‑step XML configurations for single and multiple repositories, profile activation, and project‑level repository definitions.
This tutorial demonstrates how to create a Maven Java project, add the ZXing library, implement utility classes for QR code generation and decoding, and run a sample application that produces a QR code image and reads its content back, complete with code examples and configuration details.
Spring Boot Admin version 2.2.4 has been released as a bug‑fix update that adds compatibility with Spring Boot 2.3.x, includes a brief overview of its monitoring capabilities, provides Maven dependency snippets, and lists the resolved issues and a link to the GitHub repository.
This tutorial explains how to set up a Maven project, add the ZXing library, implement utility classes for image processing, and write a Java application that creates and decodes QR codes, optionally embedding a logo, with full source code examples.
This article provides a step‑by‑step Netty tutorial for Java beginners, covering framework basics, installation of JDK, Maven and IDEA, core Netty components, differences between BIO/NIO/AIO, practical usage scenarios, and complete client‑server code to transmit a simple string.
This article provides a concise overview of SpringBoot, covering its core functionalities, pros and cons, CLI tool, Maven build setup, and frequently used annotations, followed by a promotion for a comprehensive interview question PDF collection targeting major internet companies.
This article introduces JAVE2, a Java wrapper for FFmpeg that enables audio and video transcoding, explains installation requirements, shows how to integrate it via Maven/Gradle, provides practical code examples for format conversion and progress monitoring, and addresses common pitfalls such as missing native binaries.
Spring Boot’s shift from Maven to Gradle, introduced in version 2.3.0.M1, dramatically cuts build times—from over an hour with Maven to under ten seconds on average with Gradle—by enabling incremental and parallel builds, while still supporting Maven for dependency management.
This guide explains why SpringBoot JARs become large when including many dependencies, shows how to inspect the packaged lib folder, and provides step‑by‑step instructions—including Maven configuration changes and command‑line tricks—to produce a slimmer JAR without bundled external libraries, improving deployment efficiency.
This article explains how to use Maven parent POMs, properties, and BOM (Bill of Materials) to centrally manage version numbers across multi‑module Java projects, resolve dependency conflicts, and simplify builds for backend development teams.
This article introduces EvoSuite, an open‑source tool for automatically generating JUnit test suites, explains how to configure it with Maven (including the required pom.xml entries), describes essential command‑line options, and provides step‑by‑step instructions for installing and using the EvoSuite plugin in IntelliJ IDEA, supplemented by practical examples and coverage analysis.
This guide walks through installing Jenkins and Nexus Repository Manager in Docker, configuring a Maven hosted repository, adding credentials, and creating a Jenkins pipeline that builds a Java project and publishes artifacts to Nexus, illustrating a complete DevOps CI/CD workflow.
This article walks readers through building a high‑efficiency API testing workflow using Swagger’s automated documentation and Springfox integration, covering setup, configuration, mock services, code coverage, keyword‑driven automation, and practical deployment examples with Maven dependencies and live Swagger UI demonstrations.
Learn how to package a Spring Boot application into a Docker image using three Maven plugins—spring-boot-maven-plugin's build-image, Google's jib-maven-plugin, and the dockerfile-maven-plugin—complete with setup steps, command examples, and tips for container testing.
This article presents a concise Redisson distributed‑lock example with Maven configuration, demonstrates basic lock usage, enumerates the Redis commands and Lua script semantics involved, and provides a detailed walkthrough of the relevant Java source code, highlighting key implementation details.
This article provides a comprehensive step‑by‑step guide to configuring IntelliJ IDEA, covering Maven setup, code‑style settings, case‑sensitive completion, forced Maven dependency refresh, default configuration locations, plugin installation, shortcut customizations, presentation mode, inject‑language feature, and various other useful IDE tricks for Java developers.
This article provides a comprehensive collection of IntelliJ IDEA configuration steps, shortcuts, and productivity tips—including Maven setup, code‑style adjustments, keymap changes, plugin installation, presentation mode, inject‑language usage, and common troubleshooting—to help developers work more efficiently in Java projects.
Spring Boot’s 2.3.0 release marked a major shift from Maven to Gradle, driven by the need to reduce build times, leverage incremental and parallel builds, and improve CI efficiency, resulting in average build times dropping from over an hour to just over nine minutes.
This guide explains how to structure a Maven project to run unit tests and integration tests separately, configure the Build Helper, Surefire, Failsafe, and JaCoCo plugins, and generate combined test reports that can be visualized in SonarQube.
This article provides a step‑by‑step guide to using Google's open‑source gRPC framework in Java, covering Protocol Buffers service definitions, Maven configuration, Spring Boot server implementation, client creation, and unit testing to demonstrate cross‑language RPC communication.
This article walks through the complete process of designing and implementing a lightweight Java logging framework—covering motivation, core components, annotation processing, configuration handling, message queuing, and a full example with code snippets and test results.
This article explains the fundamentals of FastDFS, its tracker and storage architecture, the file upload/download workflow, and provides a step‑by‑step Maven‑based Java example—including configuration, dependency setup, and code—to demonstrate how to store and retrieve files in a FastDFS cluster.
This article introduces ten essential IntelliJ IDEA plugins—including FindBugs, Translation, Grep Console, GsonFormat, Free MyBatis Plugin, CodeGlance, Maven Helper, Background Image Plus+, MyBatis Log Plugin, and RestfulToolkit—that help Java developers improve code quality, debugging, navigation, and overall workflow efficiency.
Chinese developers can dramatically improve Maven dependency resolution and Spring Boot project setup speed by configuring Alibaba’s domestic Maven mirror and using the Alibaba-hosted Spring Initializr, which offers faster, stable access to libraries and a convenient UI for generating starter projects.
This article explains the distinctions between Spring and Spring Boot, covering their core concepts, Maven dependencies, MVC and template engine configurations, security setup, bootstrapping mechanisms, packaging options, and deployment strategies, with detailed code examples throughout.
This guide explains why Spring Boot JARs become bulky when packaged with many dependencies, and provides a step‑by‑step method—including Maven commands and configuration changes—to strip out unnecessary lib files, dramatically reducing the final artifact size for smoother production deployments.
This tutorial walks through setting up a Spring Cloud micro‑service project by cloning a code‑generator framework, adding backend code, configuring database and Maven settings, launching the generator service, generating CRUD code, and integrating a common utility module with required dependencies.
Spring Cloud Alibaba 2.2.1 introduces Consul data source support for Sentinel, configurable health checks for Nacos, restructures modules by moving Alibaba commercial components out of spring-cloud-alibaba, renames starter packages, adds conditional health indicator annotations, and updates Maven dependency management coordinates.
This guide shows Java developers how to accelerate dependency fetching by configuring Alibaba's Maven mirror and how to speed up Spring Boot project creation using the domestic Spring Initializr hosted at start.aliyun.com, complete with step‑by‑step instructions and code snippets.
This tutorial walks through creating an empty GitHub repository, importing it, adding a content service and additional microservices, configuring the Maven parent pom, setting up a root Maven configuration and .gitignore, and finally committing the code for the PassJava Java microservice suite.
This guide walks you through installing Java 1.8, configuring Maven with Alibaba mirrors, setting up IDEA for Maven builds and Lombok, and installing VSCode with a collection of useful extensions to create a complete Java development workspace.
The article explains how a Maven plugin can automatically compile only changed files and skip unit tests when code is unchanged, dramatically reducing build time, and provides step‑by‑step instructions with the necessary pom.xml configuration and a sample XML snippet.
This guide walks you through Maven's repository types, dependency declarations, conflict resolution strategies, best‑practice checks, standard directory layout, lifecycle phases, and scope definitions, helping Java developers confidently manage multi‑module projects.
This guide introduces Pig4Cloud’s custom Spring Initializr, explains why it outperforms start.spring.io and start.aliyun.com, details usage steps, highlights enhancements such as .gitignore, .editorconfig, yml defaults, Maven test inclusion, and provides Docker deployment instructions for rapid backend project setup.
This article provides a concise introduction to Maven artifacts, explains what Maven and Maven repositories are, describes the difference between public and private repositories, and shows how Maven simplifies dependency management for Java developers.
This tutorial guides you through creating a basic Spring Boot calculator app, adding JUnit 4 tests, then fully migrating the project to JUnit 5 by updating dependencies, rewriting test annotations, and leveraging new JUnit 5 features such as @ExtendWith and @DisplayName.
This article explains how to replace Flink's default Log4j logger with Logback by adding Maven dependencies, excluding transitive Log4j artifacts, updating Flink's lib directory, and customizing Logback XML configurations including a rolling file appender and optional email alerts.
This guide explains what Maven dependency conflicts are, why they matter, and provides step‑by‑step methods—including exclusion tags, the Maven Helper IntelliJ plugin, and IDEA’s dependency diagram—to identify and eliminate conflicting JAR versions in Java projects.
This guide shows how to add Spring Boot DevTools, configure Maven and IntelliJ IDEA, and use both manual and automatic hot‑deployment techniques—including registry tweaks and template cache settings—to achieve instant code changes without restarting the application.
This article demonstrates how to use Apache POI in a Maven‑based Java project to read and write both XLS and XLSX Excel files, covering library setup, core APIs, data type handling, and practical import/export implementations with Spring MVC and MyBatis.
Spring Cloud Hoxton.SR2 was released on February 19, 2020, bringing updates to Spring Cloud Stream and Function, while the project version stays at SR1 and the release includes no linked issues or bug‑fix logs, accompanied by Maven dependency details and reference links.
Learn how to create a Sonatype account, configure Maven POM metadata, add source and Javadoc jars, sign artifacts with GPG, set up Gradle publishing plugins, and deploy both SNAPSHOT and RELEASE versions to Sonatype’s OSS repository using Gradle 6.2.
This tutorial explains how to install the EasyCode plugin, set up a MySQL database, configure IDEA, generate entity, controller, service, DAO, and mapper code for a Spring Boot project, and adjust Maven and YAML settings to run the application successfully.
This tutorial introduces Maven integration, outlining its key features, installation and configuration steps, and how to manage dependencies via coordinate repositories, targeting learners interested in DevOps and build automation.
This article explains the major changes in Spock 2.0 M1, how to integrate it with JUnit 5 via the JUnit Platform, provides step‑by‑step Gradle and Maven configurations, discusses compatibility issues with Groovy versions, and offers solutions for JUnit 4 Rule migration.
This article guides readers through configuring a Maven project for MyBatis-Plus by adding the necessary dependencies, installing Lombok, and addressing typical IDE and dependency‑resolution errors, providing code snippets and screenshots to help Java backend developers get started quickly.
This article outlines the essential steps for creating a traditional Java web application, covering environment preparation, Maven skeleton creation, required dependencies for logging, databases, persistence, Spring integration, DAO and service layers, unit testing, and RESTful controller configuration.
This article presents a curated list of the ten most essential Eclipse plugins for Java developers, explaining how each tool—ranging from Git integration and Spring support to Maven, SVN, code coverage, and live reload—boosts productivity and streamlines common development workflows.
This guide explains what Maven dependency conflicts are, why they can cause runtime errors, and provides step‑by‑step methods—including exclusion tags and the Maven Helper plugin—to identify and eliminate conflicting JAR versions in Java projects.
This article presents a step‑by‑step guide for building a real‑time data pipeline using Kafka as a message buffer, Spark‑Streaming's Direct Approach for processing, and HBase for storage, including code examples, Maven configuration, local cluster setup, and troubleshooting tips.
