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https://issues.apache.org/jira/browse/MNG-6420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17008312#comment-17008312
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Elliotte Rusty Harold commented on MNG-6420:
--------------------------------------------
Found this tidbit from [Joerg
Schaible|https://cwiki.apache.org/confluence/display/~joehni] in the Wiki:
{quote}
The version scheme for Xpp3 has never been understood by Maven (and lead in the
public repo to quite a mess), they use directly the alphabet to number their
releases:
{quote}
{quote} 1.1.3.4.C -> 1.1.3.4.D -> ... -> 1.1.3.4.O
1.1.3.7
1.1.3.8
1.1.4 -> 1.1.4b -> 1.1.4c
[http://www.extreme.indiana.edu/dist/java-repository/xpp3/distributions/]
{quote}
This is a real world case where our handling of letters after dots seems to be
exactly backwards.
> ComparableVersion incorrectly parses certain version strings
> ------------------------------------------------------------
>
> Key: MNG-6420
> URL: https://issues.apache.org/jira/browse/MNG-6420
> Project: Maven
> Issue Type: Bug
> Components: core
> Affects Versions: 3.5.3, 3.6.3
> Reporter: Ross Goldberg
> Priority: Major
>
> For certain version strings, ComparableVersion doesn't follow the Maven
> version order spec
> (https://maven.apache.org/pom.html#Version_Order_Specification), and/or
> produces canonical versions that are incongruent with both the spec and the
> code's ordering.
> To improve the code & fix the following bugs, I completely rewrote the
> version parser (using Java 8). I will create a PR sometime soon.
> *Bug 1: comparison violates spec ordering*
>
> java -jar /usr/local/Cellar/maven/3.5.3/libexec/lib/maven-artifact-3.6.3.jar
> 1-0.3 1
>
> Outputs:
>
> 1. 1-0.3 == 1-0.3
> 1-0.3 == 1
> 2. 1 == 1
>
> This problem stems from:
>
> [https://github.com/apache/maven/blob/b8c06e61ab73cd9e25a5b2c93d9e5077b2196751/maven-artifact/src/main/java/org/apache/maven/artifact/versioning/ComparableVersion.java#L295-L296]
>
>
>
> *Bug 2: canonical incongruent with spec and code ordering*
>
> java -jar /usr/local/Cellar/maven/3.5.3/libexec/lib/maven-artifact-3.6.3.jar
> 1-0-2 1-0.1
>
> 1. 1-0-2 == 1-2
> 1-0-2 < 1-0.1
> 2. 1-0.1 == 1-0.1
>
> This problem stems from retaining ListItems that, after normalization, have
> no children other than the subsequent ListItem. Removing the unnecessary
> ListItem should fix this (i.e. remove the extraneous ListItem (named
> extraneous) from its parent ListItem (named parent), then add the only child
> of extraneous to parent).
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