spark streaming + kafka

/home/yk/spark/bin/spark-submit \
--master spark://172.16.2.106:7077 \
--class streaming.java.sk0_8.JavaKafkaWordCount \
--executor-memory 1g \
--executor-cores 2 \
/mnt/yk/run_jars/sparkDemo-1.0-SNAPSHOT.jar master106:2181 xxx-group xxx 3

// 报错信息如下：
Caused by: java.lang.ClassNotFoundException: org.apache.spark.streaming.kafka.KafkaUtils