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https://issues.apache.org/jira/browse/MNG-7700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17690617#comment-17690617
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David M. Lloyd commented on MNG-7700:
-------------------------------------
This is easy to test by hand using [JBang|https://www.jbang.dev/]:
{code}
$ jbang org.apache.maven:maven-artifact:3.8.6 1.x
Display parameters as parsed by Maven (in canonical form and as a list of
tokens) and comparison result:
1. 1.x -> 1.x; tokens: [1, x]
{code}
{code}
$ jbang org.apache.maven:maven-artifact:3.8.7 1.x
Display parameters as parsed by Maven (in canonical form and as a list of
tokens) and comparison result:
1. 1.x -> 1-x; tokens: [1, [x]]
{code}
> 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: 3.8.7, 3.9.0
> Reporter: David M. Lloyd
> Priority: Major
> Fix For: waiting-for-feedback
>
>
> 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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