majialong created KAFKA-20751:
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Summary: 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
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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