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Idea / RFE Review. Thank you for taking the time to raise this enhancement request, and also for supplying the background of the Case number which was resolved by IBM support. For the benefit of other future readers, the case concerned the ability of the Kafka Consumer node to start reading messages from Kafka at a particular specific offset. The KafkaConsumer node has this capability, but specifically your use case wanted to seed the value for the offset from an external jar file. This kind of extension has not previously been requested and is not an area we are intending to invest in at the moment. Note that such a jar file could be accessed from a midflow position using a JavaCompute node, and then the offset value could be passed to a downstream KafkaRead node (using LocalEnvironment.Destination.Kafka.Read.offset):
https://www.ibm.com/docs/en/app-connect/11.0.0?topic=messages-using-local-environment-variables-kafka-nodes
Also note that the KafkaConsumer node Advanced Properties includes a "Properties file" which takes the full path name of a kafka.properties file to set Kafka client properties. You can use a properties file to set properties on the Kafka consumer that cannot be set through the KafkaConsumer node properties. If the properties file specifies a property that is also set on the KafkaConsumer node or by a Kafka policy, the value set in the properties file takes precedence.