nexus-staging-maven-plugin如何使用<scm>信息？多模块Maven配置疑问

Let's break down your two questions clearly:

1. Do I need to redeclare <scm> in child modules to match the parent's URL? #

You absolutely don't have to rewrite the entire <scm> section in every child module if you want the base URL to stay identical to the parent. Maven's default behavior of appending the module path to the <scm><url> is intentional—it’s meant to point users straight to the subdirectory of that module in your Git repo. But if that’s not what you want, you’ve got simple options:

• Override just the <url> in child modules: No need to repeat the whole <scm> block. Just add a minimal <scm> section in each child pom.xml that only includes the <url> matching the parent’s. This overrides the path-appending behavior:

  <scm>
    <url>https://bitbucket.org/example/foobar</url>
  </scm>
  

• Use a property for DRY configuration: Define a base SCM URL property in the parent POM, then reference it everywhere. This makes future URL updates a single change instead of editing every module:
  Parent POM snippet:

  <properties>
    <scm.base.url>https://bitbucket.org/example/foobar</scm.base.url>
  </properties>
  <scm>
    <connection>scm:git:${scm.base.url}.git</connection>
    <developerConnection>scm:git:${scm.base.url}.git</developerConnection>
    <url>${scm.base.url}</url>
  </scm>
  

  Child POM snippet:

  <scm>
    <url>${scm.base.url}</url>
  </scm>
  

Just remember: the default path-appending isn’t a bug—it’s a feature to help users navigate directly to the module’s code. But if your repo structure doesn’t align with module paths, or you prefer the base URL for consistency, overriding is totally valid.

2. How does nexus-staging-maven-plugin use the <scm> information? #

The staging plugin leverages your SCM config mainly for metadata and integration with Nexus/Maven Central:

• Populates artifact POM metadata: When you deploy modules to Nexus, the plugin ensures the final POM (with inherited or overridden SCM details) is attached to the artifact. This lets anyone using your library find the source code easily.
• Adds repo links in Nexus UI: Nexus uses the <scm><url> to create a direct link from the artifact’s page in the repository to your Git repo—so users can jump from the binary artifact straight to the source.
• Supports smooth release workflows: If you use this plugin with maven-release-plugin, the connection and developerConnection values are used for Git operations like creating release tags and pushing changes. While the release plugin handles the Git work directly, the staging plugin relies on correct SCM config to keep the release process aligned with your version control.

Also, if you’re publishing to Maven Central, valid SCM info is a requirement—Sonatype’s validation checks will fail your staging repo if this info is missing or incorrect, so getting this right is key.

内容的提问来源于stack exchange，提问作者Garret Wilson