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https://issues.apache.org/jira/browse/MNG-7052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17281255#comment-17281255
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Robert Scholte commented on MNG-7052:
-------------------------------------
Maven 4 will break things, because we are going to tighten some rules to
improve stabilitity and consistency. We completely missed the validation of
ids.
The problem is less big than you might think, because it is only about ids in
the reactor. So updating your pom by providing a valid id will fix it.
> Do not allow symbols as first character of identifiers in the POM
> -----------------------------------------------------------------
>
> Key: MNG-7052
> URL: https://issues.apache.org/jira/browse/MNG-7052
> Project: Maven
> Issue Type: Improvement
> Components: core
> Reporter: Martin Kanters
> Priority: Major
> Labels: up-for-grabs
> Fix For: 4.0.x-candidate
>
>
> In the {{DefaultModelValidator}} we currently validate identifiers against
> {{a-zA-Z0-9-_.}}
> Since Maven also allows operators to be used against an identifier, this can
> result in bugs or at least unexpected behavior for the user.
> The minus operator can be used to deactivate a certain profile, so an example
> would be:
> - A project having a profile with the id {{-id-of-profile}}
> - A Maven invocation of {{mvn <goal> -P-id-of-profile}}.
> The release of Maven 4 is a nice opportunity to restrict the first character
> of an id to be {{a-zA-Z0-9}} . The other characters may still consist of
> those symbols.
> This should apply to all identifiers that we support. The methods that need
> attention are:
> {{DefaultModelValidator#validateId}} and
> {{DefaultModelValidator#validateIdWithWildcards}}.
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