父母和子女之间的Maven2共享依赖关系（没有重新声明儿童的依赖关系） [英] Maven2 sharing dependencies across parent and children (without redeclaring dependencies in children)

问题描述

使用maven1，我使用扩展标签来告诉我的孩子项目使用他们的父配置。

With maven1 I was using the extend tag to tell my children project to use their parent configuration.

父中声明的所有依赖项可用于扩展（子级）项目。

All dependencies declared in the parent were available in extending (children) projects.

现在使用maven2我使用继承/组合功能，我必须重新声明我的依赖项（减去版本号）每个孩子项目。
（请参阅如何共享 - 共享 - 属性 - 几个maven项目）

Now with maven2 I'm using the inheritance/composition feature and I have to redeclare my dependencies (minus the version number) in every child project. (see how-to-share-common-properties-among-several-maven-projects)

有没有办法告诉maven我想在我所有的孩子中分享我的一些依赖项？

Is there a way to tell maven that I want to share some of my dependencies among all my children ?

推荐答案

现在用maven2我使用继承/组合功能，我必须重新声明我的每个子项目中的依赖关系（减去版本号）

Now with maven2 I'm using the inheritance/composition feature and I have to redeclare my dependencies (minus the version number) in every child project

不，你没有。在父pom中声明的依赖关系是继承的。

No, you don't. Dependencies declared in the parent pom are inherited.

有没有办法告诉maven我想在我所有的孩子们？

Is there a way to tell maven that I want to share some of my dependencies among all my children ?

只需在子POM中声明< parent> 元素。例如，使用这个父POM：

Just declare the <parent> element in child POMs. For example, with this parent POM:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>my.group.id</groupId>
  <artifactId>parent</artifactId>
  <packaging>pom</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>Demo - Parent</name>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <modules>
    <module>child</module>
  </modules>
</project>

这个孩子模块的POM：

And this POM for the child module:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <groupId>my.group.id</groupId>
    <artifactId>parent</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <name>Demo - Child</name>
  <artifactId>child</artifactId>
  <packaging>jar</packaging>
</project>

junit依赖项按预期继承：

The junit dependency gets inherited as expected:

$ mvn dependency:tree 
[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'dependency'.
[INFO] ------------------------------------------------------------------------
[INFO] Building Demo - Child
[INFO]    task-segment: [dependency:tree]
[INFO] ------------------------------------------------------------------------
[INFO] [dependency:tree {execution: default-cli}]
[INFO] my.group.id:child:jar:1.0-SNAPSHOT
[INFO] \- junit:junit:jar:3.8.1:test
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
...

我怀疑你在< a href =http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Management =noreferrer> < dependencyManagement> 部分（其另一目的）。

I suspect that you are declaring dependencies in the <dependencyManagement> section (which has another purpose).

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