Issue of serializer using camel-kafka component

Issue

• Using camel-kafka component in a route camel like following:

<recipientList>
<simple>kafka:localhost:9092?topic=${in.header.topic}&amp;zookeeperHost=localhost&amp;zookeeperPort=2181&amp;requestRequiredAcks=-1</simple>
</recipientList>

we got java.lang.ClassCastException: java.lang.String cannot be cast to [B:

java.lang.ClassCastException: java.lang.String cannot be cast to [B
    at kafka.serializer.DefaultEncoder.toBytes(Encoder.scala:34)[343:org.apache.servicemix.bundles.kafka_2.10:0.8.2.0_1]
    at kafka.producer.async.DefaultEventHandler$$anonfun$serialize$1.apply(DefaultEventHandler.scala:130)[343:org.apache.servicemix.bundles.kafka_2.10:0.8.2.0_1]
    at kafka.producer.async.DefaultEventHandler$$anonfun$serialize$1.apply(DefaultEventHandler.scala:125)[343:org.apache.servicemix.bundles.kafka_2.10:0.8.2.0_1]
    at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)[382:org.scala-lang.scala-library:2.10.4.v20140209-180020-VFINAL-b66a39653b]
    at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:34)[382:org.scala-lang.scala-library:2.10.4.v20140209-180020-VFINAL-b66a39653b]
    at kafka.producer.async.DefaultEventHandler.serialize(DefaultEventHandler.scala:125)[343:org.apache.servicemix.bundles.kafka_2.10:0.8.2.0_1]
    at kafka.producer.async.DefaultEventHandler.handle(DefaultEventHandler.scala:52)[343:org.apache.servicemix.bundles.kafka_2.10:0.8.2.0_1]
    at kafka.producer.Producer.send(Producer.scala:77)[343:org.apache.servicemix.bundles.kafka_2.10:0.8.2.0_1]
    at kafka.javaapi.producer.Producer.send(Producer.scala:33)[343:org.apache.servicemix.bundles.kafka_2.10:0.8.2.0_1]
    at org.apache.camel.component.kafka.KafkaProducer.process(KafkaProducer.java:84)[297:org.apache.camel.camel-kafka:2.15.1.redhat-621084]
...
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to [B