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https://issues.apache.org/jira/browse/SLING-4461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14363031#comment-14363031
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Carsten Ziegeler commented on SLING-4461:
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I think the fallback to the default user is - if at all - the problematic one;
a fallback within a bundle sounds reasonable, a global fallback sounds more
like to make someones life easier who does not really care about this :)
> Remove fallbacks for service users resolution
> ---------------------------------------------
>
> Key: SLING-4461
> URL: https://issues.apache.org/jira/browse/SLING-4461
> Project: Sling
> Issue Type: Improvement
> Components: Service User Mapper
> Reporter: Marius Petria
>
> ServiceUserMapperImpl has several levels of fallback for service user
> resolution (fallback to bundle default, or to global default). While this
> offers a lot of flexibility, it introduces non-determinism in a security
> feature. If defaults are set, it can happen (especially at startup) that code
> is executed using different serviceUsers, e.g. a component can execute using
> the bundle default or global default until its specific subService is
> available, and it can be easily imagined how this can cause subtle errors.
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