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https://issues.apache.org/jira/browse/UIMA-1727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jerry Cwiklik closed UIMA-1727.
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Resolution: Fixed
Added a check for null to prevent adding bad references to the list of callback
listeners. Also, before calling the registered listener code now checks for
null reference.
> CPM doesnt validate registered CallbackListener references
> -----------------------------------------------------------
>
> Key: UIMA-1727
> URL: https://issues.apache.org/jira/browse/UIMA-1727
> Project: UIMA
> Issue Type: Bug
> Components: Collection Processing
> Reporter: Jerry Cwiklik
> Assignee: Jerry Cwiklik
>
> The CPM uses a list of registered listeners to notify an application of
> certain events. The application registers listeners with the CPM before it
> starts the run. Apparently, the CPM doesnt validate a listener reference
> provided by the application and blindly adds it a list. If the reference is
> null, the NPE is thrown when trying to send notifications. Fix the code to
> validate listener reference to prevent adding null references.
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