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https://issues.apache.org/jira/browse/KAFKA-14649?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Harris updated KAFKA-14649:
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Summary: Failures instantiating Connect plugins hides other plugins from
REST API (was: Failures instantiating Connect plugins crash worker on startup)
> Failures instantiating Connect plugins hides other plugins from REST API
> ------------------------------------------------------------------------
>
> Key: KAFKA-14649
> URL: https://issues.apache.org/jira/browse/KAFKA-14649
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 3.1.0, 3.0.0, 3.2.0, 3.3.0, 3.4.0
> Reporter: Greg Harris
> Assignee: Greg Harris
> Priority: Minor
>
> Connect plugin path scanning evaluates the version() method of plugins to
> determine which version of a plugin to load, and what version to advertise as
> part of the REST API. This process involves reflectively constructing an
> instance of the class and calling the version method, which can fail in the
> following scenarios:
> 1. If a plugin throws an exception from a static initialization block
> 2. If a plugin does not have a default constructor (such as a non-static
> inner class)
> 3. If a plugin has a default constructor is not public
> 4. If a plugin throws an exception from the default constructor
> 5. If a plugin's version method throws an exception
> If any of the above is true for any single connector or rest extension on the
> classpath or plugin.path, the worker will fail to start up entirely. This is
> primarily an issue in development and test environments, because they are
> easy-to-make code mistakes that would generally not make it to a release.
> It is desirable for the worker to instead log these exceptions and continue.
> This will prevent one mis-implemented plugin from affecting other plugins,
> while still causing integration tests to fail against the plugin itself. We
> can augment logging to make it clear how to correct these failures, where
> before it was rather opaque and difficult to debug.
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