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Posted to issues@maven.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2019/01/09 23:32:01 UTC
[jira] [Commented] (MNG-6164) Collections inconsistently immutable
[ https://issues.apache.org/jira/browse/MNG-6164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16738777#comment-16738777 ]
Hudson commented on MNG-6164:
-----------------------------
Build failed in Jenkins: Maven TLP » maven » MNG-6069 #23
See https://builds.apache.org/job/maven-box/job/maven/job/MNG-6069/23/
> 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
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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