Add jar to general Kafka Connect classpath in the Confluent Docker

docker apache-kafka apache-kafka-connect confluent-platform

If you want to add a jar that will be used by the Connect framework and is not specific to any of the connectors, you have the following options:

Add the jar to the classpath with:
-e CLASSPATH=/path/to/custom/library.jar
Copy the jar directly to the directory that includes the Kafka Connect framework. In Confluent docker images this is currently:
/usr/share/java/kafka

You need to make sure this jar is not in conflict with any of the dependencies of Kafka Connect.

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