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https://issues.apache.org/jira/browse/KAFKA-13329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Egerton resolved KAFKA-13329.
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Fix Version/s: 3.8.0
Resolution: Fixed
> Connect does not perform preflight validation for per-connector key and value
> converters
> ----------------------------------------------------------------------------------------
>
> Key: KAFKA-13329
> URL: https://issues.apache.org/jira/browse/KAFKA-13329
> Project: Kafka
> Issue Type: Bug
> Components: connect
> Reporter: Chris Egerton
> Assignee: Chris Egerton
> Priority: Major
> Fix For: 3.8.0
>
>
> Users may specify a key and/or value converter class for their connector
> directly in the configuration for that connector. If this occurs, no
> preflight validation is performed to ensure that the specified converter is
> valid.
> Unfortunately, the [Converter
> interface|https://github.com/apache/kafka/blob/4eb386f6e060e12e1940c0d780987e3a7c438d74/connect/api/src/main/java/org/apache/kafka/connect/storage/Converter.java]
> does not require converters to expose a {{ConfigDef}} (unlike the
> [HeaderConverter
> interface|https://github.com/apache/kafka/blob/4eb386f6e060e12e1940c0d780987e3a7c438d74/connect/api/src/main/java/org/apache/kafka/connect/storage/HeaderConverter.java#L48-L52],
> which does have that requirement), so it's unlikely that the configuration
> properties of the converter itself can be validated.
> However, we can and should still validate that the converter class exists,
> can be instantiated (i.e., has a public, no-args constructor and is a
> concrete, non-abstract class), and implements the {{Converter}} interface.
> *EDIT:* Since this ticket was originally filed, a {{Converter::config}}
> method was added in
> [KIP-769|https://cwiki.apache.org/confluence/display/KAFKA/KIP-769%3A+Connect+APIs+to+list+all+connector+plugins+and+retrieve+their+configuration+definitions].
> We can now utilize that config definition during preflight validation for
> connectors.
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