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https://issues.apache.org/jira/browse/NIFI-15693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann updated NIFI-15693:
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Status: Patch Available (was: In Progress)
> Flow Synchronization Fails with empty File User Groups
> ------------------------------------------------------
>
> Key: NIFI-15693
> URL: https://issues.apache.org/jira/browse/NIFI-15693
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework, Security
> Affects Versions: 2.7.2, 2.7.1, 2.8.0, 2.7.0
> Reporter: David Handermann
> Assignee: David Handermann
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Following recent refactoring of the {{FileUserGroupProvider}} to use DOM
> instead of JAXB for parsing XML files, flow synchronization between cluster
> nodes can fail when the users.xml configuration is empty.
> On initial load, the AuthorizedUserGroups record object contains empty
> immutable Lists of users and groups when the local users.xml configuration is
> empty. The synchronization process calls {{forciblyInheritFingerprint}} on
> {{FileUserGroupProvider}} which can result in a
> {{FlowSynchronizationException}} caused by an
> {{UnsupportedOperationException}} on the empty immutable Lists in memory.
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