[jira] [Created] (MNG-7700) Improper canonicalization of versions

["David M. Lloyd (Jira)" <ji...@apache.org>]

David M. Lloyd created MNG-7700:
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             Summary: Improper canonicalization of versions
                 Key: MNG-7700
                 URL: https://issues.apache.org/jira/browse/MNG-7700
             Project: Maven
          Issue Type: Bug
          Components: Core
    Affects Versions: 3.9.0, 3.8.7
            Reporter: David M. Lloyd


The canonicalization logic for versions is incorrect.

Using the method {{ComparableVersion#getCanonical}} as in {{new ComparableVersion(input).getCanonical()}}, the following results can be observed:

||Input||3.8.6 Output||3.8.6 OK?||3.9.0 Output||3.9.0 OK?||
|{{1}}|{{1}}|yes|{{1}}|yes|
|{{0.1}}|{{0.1}}|yes|{{0.1}}|yes|
|{{0-1}}|{{1}}|no|{{1}}|no|
|{{1.x}}|{{1.x}}|yes|{{1-x}}|maybe*|
|{{1-x}}|{{1-x}}|yes|{{1-x}}|yes|
|{{0.x}}|{{0.x}}|yes|{{x}}|no|
|{{0-x}}|{{x}}|no|{{x}}|no|
|{{x}}|{{x}}|yes|{{x}}|yes|


The "OK?" columns indicate whether parsing the canonical version string will yield a {{ComparableVersion}} instance that is {{equal}} to one constructed from the original input, i.e. it's internally consistent.

The "maybe*" item indicates that starting with 3.9.0, version `1.x` is now considered to be equal to `1-x`. I'm not sure if this is a bug or not, or was intentional or not, but it is definitely a change.

These canonicalizations seem to have gotten less consistent in the move to 3.9.0.



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