Alexandre Dupriez created KAFKA-8752:
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Summary: Ensure plugin classes are instantiable when discovering
plugins
Key: KAFKA-8752
URL: https://issues.apache.org/jira/browse/KAFKA-8752
Project: Kafka
Issue Type: Bug
Components: core
Reporter: Alexandre Dupriez
Assignee: Alexandre Dupriez
While running integration tests from the IntelliJ IDE, it appears plugins fail
to load in {{DelegatingClassLoader.scanUrlsAndAddPlugins}}. The reason was, in
this case, that the class
{{org.apache.kafka.connect.connector.ConnectorReconfigurationTest$TestConnector}}
could not be instantiated - which it does not intend to be.
The problem does not when running integration tests with Gradle as the runtime
closure is different from IntelliJ - which includes test sources from modules
depended on on the classpath.
While debugging this minor inconvenience, I could see that
{{DelegatingClassLoader}} performs a sanity check on the plugin class to
instantiate - as of now, it verifies the class is concrete. A quick fix for the
problem highlighted above could to add an extra condition on the Java modifiers
of the class to ensure it will be instantiable.
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