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https://issues.apache.org/jira/browse/JCR-3552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616297#comment-13616297
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Lars Krapf commented on JCR-3552:
---------------------------------

User management collects and caches group membership information in the 
membership provider, therefore the private field on the principal can be 
dropped. 
There is no expected log-in performance impact associated with the proposed 
change, as the default login-module uses 
PrincipalProvider.collectGroupMembership() which operates on the user 
management directly.

                
> Principal assiocated with Group does not update members
> -------------------------------------------------------
>
>                 Key: JCR-3552
>                 URL: https://issues.apache.org/jira/browse/JCR-3552
>             Project: Jackrabbit Content Repository
>          Issue Type: Bug
>          Components: jackrabbit-core, security
>            Reporter: Lars Krapf
>
> The Principal associated with a GroupImpl keeps a private member cache, which 
> does not get
> updated after a group membership modification.
> This leads to inconsistencies in combination with default PrincipalProvider 
> that keeps a separate principal cache.

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