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https://issues.apache.org/jira/browse/OAK-7323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16391456#comment-16391456
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Konrad Windszus commented on OAK-7323:
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yes, you are right, but still it is maybe not obvious without the additional 
logging why this is not possible.

> Log some warning or even throw some exception when trying to add  "everyone" 
> as member to other groups or add user/groups to "everyone"
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: OAK-7323
>                 URL: https://issues.apache.org/jira/browse/OAK-7323
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, security
>    Affects Versions: 1.6.10
>            Reporter: Konrad Windszus
>            Priority: Trivial
>             Fix For: 1.10
>
>
> Currently it is not allowed to extend the group {{everyone}} by putting it as 
> member to another group. The other way is prevented as well (i.e. putting 
> some group or user as member of the {{everyone}} group) as every other 
> principal is by default member of {{everyone}}. Extending the {{everyone}} 
> group would therefore lead to cycles. Although this is correctly prevented in 
> the code 
> (https://github.com/apache/jackrabbit/blob/adb1e79ae26aba5d068be56e5e9eb562344e5bb9/jackrabbit-core/src/main/java/org/apache/jackrabbit/core/security/user/GroupImpl.java#L156)
>  this is not noticed by the called. 
> I would instead suggest to fail more loudly by throwing an exception or at 
> least log a warning.



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