Several types of Maven repositories

In the context of Maven, a "repository" refers to a storage location for artifacts such as JAR files, POM files, and other resources needed during the build and deployment processes. There are several types of Maven repositories, and their differences can be summarized as follows:


1. Local Repository

  • Description: A repository located on your local machine where Maven stores all downloaded dependencies.

  • Default Location :

    • ~/.m2/repository (on Linux/Mac)
    • C:\Users\<User>\.m2\repository (on Windows)
  • How It Works :

    • When you build a Maven project, it first looks for dependencies in the local repository.
    • If not found, it downloads from remote repositories and caches them locally.
  • Configuration : Can be customized in the settings.xml file.

    <localRepository>/path/to/local/repo</localRepository>


2. Remote Repository

  • Description: A central location on the internet or an organization's network that hosts Maven artifacts.

  • Examples :

    • Maven Central (https://repo.maven.apache.org/maven2/)
    • JCenter (deprecated)
    • Custom Nexus/Artifactory repositories.
  • Usage :

    • Maven queries remote repositories if the dependency is not found locally.
  • Configuration : Add remote repositories in the pom.xml or settings.xml.

    <repositories> <repository> <id>central</id> <url>https://repo.maven.apache.org/maven2</url> </repository> </repositories>


3. Central Repository

  • Description: The default remote repository used by Maven to download dependencies.
  • URL : https://repo.maven.apache.org/maven2/
  • Characteristics :
    • Publicly accessible.
    • Maintained by the Maven project.
  • No Additional Configuration Required :
    • Maven uses this repository by default unless explicitly overridden.

4. Private/Corporate Repository

  • Description: A repository set up by an organization to host internal or third-party artifacts not available in public repositories.

  • Tools :

    • Nexus Repository Manager
    • JFrog Artifactory
    • AWS CodeArtifact
  • Benefits :

    • Enhanced control over dependencies.
    • Secure and private storage for proprietary code.
  • Configuration :

    <repositories> <repository> <id>corporate-repo</id> <url>https://my.corporate.repo/repository/maven-releases/</url> </repository> </repositories>


5. Snapshot Repository

  • Description : Dedicated to hosting -SNAPSHOT artifacts, which represent development versions of a project.

  • Usage :

    • When a project is under development, frequent updates may occur.
    • SNAPSHOT versions are updated dynamically in the repository.
  • Configuration Example :

    <repositories> <repository> <id>snapshots</id> <url>https://my.corporate.repo/repository/maven-snapshots/</url> <snapshots> <enabled>true</enabled> </snapshots> </repository> </repositories>


6. Release Repository

  • Description: Hosts stable and released versions of artifacts (non-SNAPSHOT versions).

  • Usage :

    • Used for production-ready artifacts.
    • Once deployed to the release repository, the artifacts are immutable.
  • Configuration Example :

    <repositories> <repository> <id>releases</id> <url>https://my.corporate.repo/repository/maven-releases/</url> <releases> <enabled>true</enabled> </releases> </repository> </repositories>


Key Differences Between Maven Repositories:

Type Location Purpose Example URL
Local Repository Local filesystem Cache dependencies locally for faster builds. ~/.m2/repository
Remote Repository Internet or network server Fetch dependencies not found locally. https://repo.maven.apache.org/maven2/
Central Repository Internet Default repository for Maven. https://repo.maven.apache.org/maven2/
Private Repository Private network Store proprietary or internal artifacts. https://my.corporate.repo/...
Snapshot Repository Internet/Private network Host development artifacts (-SNAPSHOT). https://my.repo.com/maven-snapshots/
Release Repository Internet/Private network Host production-ready, immutable artifacts (non-SNAPSHOT). https://my.repo.com/maven-releases/
相关推荐
用户298698530148 分钟前
Java高效读取CSV文件的方法与分步实例
java·后端
程序员卷卷狗20 分钟前
JVM实战:从内存模型到性能调优的全链路剖析
java·jvm·后端·性能优化·架构
Android-Flutter21 分钟前
kotlin - 正则表达式,识别年月日
java·kotlin
得物技术21 分钟前
线程池ThreadPoolExecutor源码深度解析|得物技术
java·编译器·dns
道可到23 分钟前
直接可以拿来的面经 | 从JDK 8到JDK 21:一次团队升级的实战经验与价值复盘
java·面试·架构
ZhengEnCi1 小时前
Java_Object 数组完全指南-从入门到精通的多类型数据存储利器
java·后端
色空大师1 小时前
【mybatisPlus详解】
java·mybatis·mybatisplus
starxg1 小时前
bkhtmltopdf - 高性能 HTML 转 PDF 工具(代替 wkhtmltopdf)
java·pdf·html·wkhtmltopdf·htmltopdf
it技术2 小时前
[入门精通] TLjava高薪扩展训练VIP系列179G69
java
ZhengEnCi2 小时前
ObjectUtils.isEmpty 完全指南-从入门到精通的 Java 空值判断利器
java·后端