[jira] [Created] (KAFKA-14863) Plugins which do not have a valid no-args constructor are visible in the REST API

["Greg Harris (Jira)" <ji...@apache.org>]

Greg Harris created KAFKA-14863:
-----------------------------------

             Summary: Plugins which do not have a valid no-args constructor are visible in the REST API
                 Key: KAFKA-14863
                 URL: https://issues.apache.org/jira/browse/KAFKA-14863
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
            Reporter: Greg Harris
            Assignee: Greg Harris


Currently, the Connect plugin discovery mechanisms only assert that a no-args constructor is present when necessary. In particular, this assertion happens for Connectors when the framework needs to evaluate the connector's version method.
It also happens for ConnectorConfigOverridePolicy, ConnectRestExtension, and ConfigProvider plugins, which are loaded via the ServiceLoader. The ServiceLoader constructs instances of plugins with their no-args constructor during discovery, so these plugins are discovered even if they are not Versioned.

This has the effect that these unusable plugins which are missing a default constructor appear in the REST API, but are not able to be instantiated or used. To make the ServiceLoader and Reflections discovery mechanisms behave more similar, this assertion should be applied to all plugins, and a log message emitted when plugins do not follow the constructor requirements.



--
This message was sent by Atlassian Jira
(v8.20.10#820010)