in rcomp-kafka/src/main/java/org/apache/karaf/rcomp/kafka/KafkaSource.java [39:46]
public KafkaSource(Properties config, String topic, Class<? extends T> type) {
this.consumer = new KafkaConsumer(config);
this.topic = topic;
if (!(type == String.class || type == ConsumerRecord.class)) {
throw new IllegalArgumentException("Curently only String and ProducerRecord are supported");
}
this.type = type;
}