[jira] [Updated] (MNG-6164) Collections inconsistently immutable

["Michael Osipov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MNG-6164?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Osipov updated MNG-6164:
--------------------------------
    Fix Version/s:     (was: 3.6.x-candidate)
                   3.6.0

> Collections inconsistently immutable
> ------------------------------------
>
>                 Key: MNG-6164
>                 URL: https://issues.apache.org/jira/browse/MNG-6164
>             Project: Maven
>          Issue Type: Improvement
>    Affects Versions: 3.5.0
>            Reporter: Christian Schulte
>            Assignee: Michael Osipov
>            Priority: Minor
>             Fix For: 3.6.0
>
>
> There are plenty of places where empty collections are returned from public API in methods written like:
> {code}
>      public List<Exception> getExceptions()
>      {
>         return exceptions == null ? Collections.<Exception>emptyList() : exceptions;
>      }
> {code}
> The issue with this is that the empty list is immutable but the collection returned for the nun-null case is not immutable.
> All those methods should return a collection with consistent "mutability": either mutable, either immutable.
> Given empty immutable collections do not cause harm until now, switching consistently to immutable collections is more conservative and should not be risky



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