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https://issues.apache.org/jira/browse/NIFI-694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14591712#comment-14591712
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Mark Payne commented on NIFI-694:
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Matt, any Exception can be thrown by the @OnEnabled methods. In this case, the
framework, I believe, will be creating bulletins. I would recommend we just
show that bulletin in the dialog that shows the Enabling status.
> If Enabling Controller Service fails, no indication is provided to user
> -----------------------------------------------------------------------
>
> Key: NIFI-694
> URL: https://issues.apache.org/jira/browse/NIFI-694
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework, Core UI
> Reporter: Mark Payne
> Fix For: 0.3.0
>
>
> To replicate the issue:
> 1. Add a DBCPService controller service.
> 2. Configure service. For the Driver Url use "file://tmp/non-existent-file"
> or use an invalid Driver Class Name.
> 3. Click Apply.
> 4. Click Enable.
> The UI will show the spinner indefinitely, as the service will keep failing
> to enable because it throws Exceptions from its @OnEnabled method. The UI
> should provide some sort of indication that this is occurring. Otherwise, it
> appears to the user that the system is non-responsive.
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