You are right. You pointed out the very cause of my problem. Thanks.
I have to specify the path to my jar file.
The solution can be found in an earlier post.
http://apache-spark-user-list.1001560.n3.nabble.com/ClassNotFoundException-with-simple-Spark-job-on-cluster-td932.html
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I am trying to write some sample code under IntelliJ IDEA. I start with a
non-sbt scala project. In order that the program compile, I add
*spark-assembly-1.1.0-hadoop2.4.0.jar* in the *spark/lib* directory as one
external library of the IDEA project.