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https://issues.apache.org/jira/browse/KAFKA-20751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mickael Maison resolved KAFKA-20751.
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Fix Version/s: 4.4.0
Resolution: Fixed
> Cached connector plugin version validation failures lose available versions
> on repeated validation
> --------------------------------------------------------------------------------------------------
>
> Key: KAFKA-20751
> URL: https://issues.apache.org/jira/browse/KAFKA-20751
> Project: Kafka
> Issue Type: Bug
> Components: connect
> Reporter: majialong
> Assignee: majialong
> Priority: Minor
> Fix For: 4.4.0
>
>
> CachedConnectors, introduced as part of KAFKA-18215, caches connector loading
> failures during config validation.
>
> When validating a connector configuration with an unavailable
> connector.plugin.version, the first validation response correctly reports the
> available plugin versions in the connector.plugin.version recommended values.
>
> Repeating the same validation may return an inconsistent result: the cached
> failure path loses the available versions from the original
> VersionedPluginLoadingException.
> The repeated validation can then fail with a NullPointerException in
> AbstractHerder.invalidVersionedConnectorValidation, when it attempts to
> stream VersionedPluginLoadingException#availableVersions() to populate the
> connector.plugin.version recommended values, resulting in a 500 response
> instead of the normal validation response.
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