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https://issues.apache.org/jira/browse/MNG-8112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17852373#comment-17852373
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Tamas Cservenak commented on MNG-8112:
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This is by design: this file resolves and adds to classpath. ext class path
means is already on classpath.
> extension.xml is ignored when extension is loaded by -Dmaven.ext.class.path
> ---------------------------------------------------------------------------
>
> Key: MNG-8112
> URL: https://issues.apache.org/jira/browse/MNG-8112
> Project: Maven
> Issue Type: Bug
> Components: Class Loading
> Affects Versions: 3.9.6
> Reporter: Rich DiCroce
> Priority: Major
>
> As the title says: extension.xml is ignored when an extension is loaded by
> -Dmaven.ext.class.path, which makes it impossible to expose any additional
> packages.
> I am filing this as a bug due to [this
> comment|https://issues.apache.org/jira/browse/MNG-6906?focusedCommentId=17719869&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-17719869]
> on MNG-6906, which says that lib/ext and -Dmaven.ext.class.path are supposed
> to be synonymous. Note that MNG-6906 is a related but different problem.
> When looking at org.apache.maven.cli.MavenCli, the problems aren't too hard
> to see:
> # lib/ext extensions get loaded into the plexus.core realm (as per m2.conf),
> but -Dmaven.ext.class.path extensions are loaded into the maven.ext realm (as
> per MavenCli#setupContainerRealm()).
> # loadCoreExtensions() operates on the coreRealm, but due to #1, the
> extensions are not in that realm. Also, the result of parseExtClasspath() is
> not passed to loadCoreExtensions(), so there is no way for
> loadCoreExtensions() to find the relevant files.
> The most obvious solution would be to call coreRealm.addURL() for each of the
> files discovered by parseExtClasspath(). This would solve #1 above which
> would implicitly fix #2. Though I don't know if it would have other
> consequences.
> If this is not a bug and is instead "works as designed", then
> [https://maven.apache.org/guides/mini/guide-using-extensions.html] needs to
> be updated to explain that the three methods of loading core extensions are
> not equivalent.
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