ClassNotFoundException when launching a Spark application with spark-submit function

Question

I am not sure how to run a Java application with spark-submit.

When I run the following command:

spark@mcava-master:/home/miren/NetBeansProjects$ /opt/spark/bin/spark-submit --class /home/miren/NetBeansProjects/SparkExample/src/main/java/com/mycompany/sparkexample/CountWords.java --master spark://192.168.1.105:7077 /home/miren/NetBeansProjects/SparkExample/target/SparkExample-1.0-SNAPSHOT.jar spark://192.168.1.105:7077

I get an exception:

java.lang.ClassNotFoundException: /home/miren/NetBeansProjects/SparkExample/src/main/java/com/mycompany/sparkexample/CountWords.java
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:348)
    at org.apache.spark.util.Utils$.classForName(Utils.scala:174)
    at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:689)
    at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)
    at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

How to specify a class path?

Answer 1

You need to call spark-submitas follows:

spark-submit --class com.mycompany.sparkexample.CountWords 
             --master spark://192.168.1.105:7077 
             /home/miren/NetBeansProjects/SparkExample/target/SparkExample-1.0-SNAPSHOT.jar 
             {your-app-arguments-here}

The parameter --classtakes the full name of the object containing your main method.

The documentation contains additional usage information spark-submit.