commit 71178c5d0307601665e9d4e3662101890266f6a5
author Stephen Connolly <stephen.alan.connolly@gmail.com> Fri Nov 22 15:46:35 2019 +0000
committer Stephen Connolly <stephenc@apache.org> Wed Mar 18 13:06:51 2020 +0000
tree 0d2dd66adc084f9ee1a6676f6f90c62b6787fdc0
parent b5401e6595960f7411b8d9cd7367598ce2412018

[MNG-5668] Add a feature experiments framework to allow for opt-in

Users get to turn on all experiments (no partial activation) by adding the experiments extension to `.mvn/extensions.xml`, e.g.

    <?xml version="1.0" encoding="UTF-8"?>
    <extensions xmlns="http://maven.apache.org/EXTENSIONS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="http://maven.apache.org/EXTENSIONS/1.0.0 http://maven.apache.org/xsd/core-extensions-1.0.0.xsd">
      <extension>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-experiments</artifactId>
        <version>3.7.0-SNAPSHOT</version>
      </extension>
    </extensions>

Without the extension, the dynamic phases feature is disabled

With the extension the feature is enabled, e.g.

    [INFO] Enabling experimental features of Maven 3.7.0-SNAPSHOT
    [INFO] Experimental features enabled:
    [INFO]   * dynamic-phases
    [INFO] Scanning for projects...

Attempts to build the project with a different (newer) version of Maven will
fail, e.g.

    [ERROR] The project uses experimental features that require exactly Maven 3.7.0-SNAPSHOT -> [Help 1]
    [ERROR]
    [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
    [ERROR] Re-run Maven using the -X switch to enable full debug logging.
    [ERROR]
    [ERROR] For more information about the errors and possible solutions, please read the following articles:
    [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MavenExecutionException

Attempts to build the project with a different (older) version of Maven
will blow up due to class not found (I'd like to determine how to lazy
resolve from Plexus/Sisu to avoid that)