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From "Alexandre Dupriez (JIRA)" <j...@apache.org>
Subject [jira] [Created] (KAFKA-8752) Ensure plugin classes are instantiable when discovering plugins
Date Mon, 05 Aug 2019 10:47:00 GMT
Alexandre Dupriez created KAFKA-8752:

             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 loadĀ inĀ {{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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