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https://issues.apache.org/jira/browse/MNG-7027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17403317#comment-17403317
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Mickael Istria commented on MNG-7027:
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> I'm not sure mutable POM files for non snapshots versions are supported by
> maven. AFAIK, a released pom has always been supposed to be immutable. That's
> the basic assumption when dealing with a maven repository which is cached in
> the local maven repository.
They actually were very well supported when disabling cache fully. This is a
requirement for devtools that would build a model/project on edit/save.
> Invalidate project cache upon changes
> -------------------------------------
>
> Key: MNG-7027
> URL: https://issues.apache.org/jira/browse/MNG-7027
> Project: Maven
> Issue Type: Improvement
> Reporter: Guillaume Nodet
> Priority: Major
>
> To keep some kind of long-living cache (mvnd does this and I suppose m2e is
> doing it too), the project cache needs to be invalidated (or disabled in the
> case of m2e).
> It would be nice if the cached entries could be invalidated upon changes.
> This could be done only for snapshots maybe (as non snapshots are kind
> supposed to be immutable and that would save quite some processing).
> In order to be non disruptive, I propose the introduction of a new component
> that would monitor files and that could be used by the {{ProjectBuilder}} to
> manage the {{ModelCache}} and also the {{MavenPluginManager}} to manage the
> {{PluginRealmCache}}.
> For the background: {{mvnd}} needs to redefine the {{ProjectBuilder}} and the
> {{PluginRealmCache}} component to work around those problems, but the
> {{DefaultProjectBuilder}} in particular is not really extensible and the
> {{org.apache.maven.project}} package has a lot of package private classes
> that makes defining a replacement class outside of the package quite
> impossible. This intermediate component would offer a pluggable way to solve
> both {{ProjectBuilder}} and {{MavenPluginManager}} problems.
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