[ https://issues.apache.org/jira/browse/KARAF-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15029637#comment-15029637 ] 

ASF GitHub Bot commented on KARAF-3017:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/karaf/pull/40


> Concurrency issues in FeaturesService related to add/remove/list operations
> ---------------------------------------------------------------------------
>
>                 Key: KARAF-3017
>                 URL: https://issues.apache.org/jira/browse/KARAF-3017
>             Project: Karaf
>          Issue Type: Bug
>    Affects Versions: 3.0.1, 2.3.5
>            Reporter: Grzegorz Grzybek
>            Assignee: Freeman Fang
>             Fix For: 2.4.0, 3.0.2, 2.3.6
>
>
> I have concurrent scripts (using shell {{bin/client.sh}} commands) which invoke {{features:listurl}}, {{features:addurl}} and {{features:removeurl}}.
> Sometimes I get {{NullPointerException}} here:
> {code:java}
>     public Repository[] listRepositories() {
>         Collection<Repository> repos = repositories.values();
>         return repos.toArray(new Repository[repos.size()]);
>     }
> {code}
> when {{org.apache.karaf.features.internal.FeaturesServiceImpl#removeRepository(java.net.URI)}} is invoked between {{repos.size()}} and {{repos.toArray()}}.



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