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https://issues.apache.org/jira/browse/MNG-7574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17634262#comment-17634262
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Konrad Windszus commented on MNG-7574:
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[~cstamas] See https://github.com/apache/maven-site/pull/338. This shows that
there is indeed a misunderstanding here as build extensions are never exposed
through the Maven Core Classloader. But they are in fact exposed through the
Maven Project Classloader and by that the Mojos from a plugin loaded with
extensions are visible from every plugin classloader. Not sure how big the
issue really is and how to solve it. Therefore closing this issue as invalid.
> Never expose Mojo classes via Core Classloader
> ----------------------------------------------
>
> Key: MNG-7574
> URL: https://issues.apache.org/jira/browse/MNG-7574
> Project: Maven
> Issue Type: Improvement
> Components: Core
> Reporter: Konrad Windszus
> Priority: Major
>
> Currently if a Maven plugin is loaded with {{<extensions>true</extensions}}
> all classes of the underlying artifact are exposed through the Maven Core
> Classloader
> (https://github.com/apache/maven/blob/415eaf31de407efcbf61166afd8cf4e86cdafe11/maven-core/src/main/java/org/apache/maven/classrealm/DefaultClassRealmManager.java#L243
> and
> https://github.com/apache/maven/blob/415eaf31de407efcbf61166afd8cf4e86cdafe11/maven-core/src/main/java/org/apache/maven/classrealm/DefaultClassRealmManager.java#L345).
> At least the Mojo classes should IMHO be excluded otherwise they are exposed
> through both the plugin and core classloader for no reason (as the core
> classloader as parent always takes precedence).
> As {{extensions}} is accepting String values
> (https://github.com/apache/maven/blob/daa8e1690226fc385db3d448ad962997afe3dba8/api/maven-api-model/src/main/mdo/maven.mdo#L2215)
> one could accept the old values "true" (all) and "false" (nothing) next to
> some allowed resource name prefixes (comma-separated).
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