df.write()
  .format("com.databricks.spark.csv")
  .option("header", "true")
  .save("/user/cloudera/csv");

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/csv/CSVFormat
...
Caused by: java.lang.ClassNotFoundException: org.apache.commons.csv.CSVFormat
... 21 more

<dependency>
  <groupId>com.databricks</groupId>
  <artifactId>spark-csv_2.10</artifactId>
  <version>1.5.0</version>
</dependency>

<dependency>
  <groupId>org.apache.commons</groupId>
  <artifactId>commons-csv</artifactId>
  <version>1.5</version>
</dependency>

<dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-sql_2.10</artifactId>
    <version>1.6.0</version>
</dependency>

spark-submit --jars /path/spark-csv_2.10-1.5.0.jar --class com.iris.Begin /path/CsvSolver.jar