Maven - 依赖继承 - 提供

Question

我使用依赖POM,然后我将其包含到另一个项目中作为依赖项.我遇到的问题是当它将POM与这些依赖关系聚合在一起时,它会在我声明范围的依赖关系时出现,前提是,这些不包括在内.

是否可以在提供范围的依赖性POM中包含提供的依赖项？我经常声明我需要的API,然后将实现包含在运行时依赖项中.

Answer 1

如果提供了依赖项,为什么不能使用相同的范围继承该依赖项,所以我不必声明它？

它是继承了相同的范围内.鉴于以下父母pom.xml:

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.stackoverflow.Q3597684</groupId>
  <artifactId>root</artifactId>
  <version>1.0-SNAPSHOT</version>
  <name>Q3597684 - Root</name>
  <packaging>pom</packaging>
  <dependencies>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

以下pom.xml继承自根工件:

<project>
  <modelVersion>4.0.0</modelVersion>
  <parent>
    <artifactId>root</artifactId>
    <groupId>com.stackoverflow.Q3597684</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <artifactId>child</artifactId>
  <packaging>war</packaging>
  <name>Q3597684 - Child</name>
  <dependencies/>
</project>

mvn dependency:tree从子进程运行提供以下输出:

$ mvn dependency:tree[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'dependency'.
[INFO] ------------------------------------------------------------------------
[INFO] Building Q3597684 - Child
[INFO]    task-segment: [dependency:tree]
[INFO] ------------------------------------------------------------------------
[INFO] [dependency:tree {execution: default-cli}]
[INFO] com.stackoverflow.Q3597684:child:war:1.0-SNAPSHOT
[INFO] +- javax.servlet:servlet-api:jar:2.5:provided
[INFO] \- junit:junit:jar:3.8.1:test
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------

servlet-api正如所料,提供的是那里.

你可能(误)使用该dependencyManagement部分吗？