has no space between "jar" and "--class"... I assume this was maybe a typo, but I thought I would mention it.
Can you run one of the Spark examples successfully? (e.g. try org.apache.spark.examples.streaming.JavaNetworkWordCount from /usr/hdp/current/spark-client/lib/spark-examples-*.jar (you will need to double check for the exact jar name). If that fails, I recommending sharing the YARN applications logs (i.e. run "yarn logs -applicationId <app id>").