Cannot load main class from JAR file

Question

I have an application Spark-scala, I tried to dispaly a simple message "Hello my App". when I compile it by sbt compile it's fine, also I run it by sbt run it's fine, I displayed my message with success but he display an error; like this:

Hello my application!
16/11/27 15:17:11 ERROR Utils: uncaught error in thread SparkListenerBus,   stopping SparkContext
        java.lang.InterruptedException
     ERROR ContextCleaner: Error in cleaning thread
    java.lang.InterruptedException
     at org.apache.spark.ContextCleaner$$anon$1.run(ContextCleaner.scala:67)
    16/11/27 15:17:11 INFO SparkUI: Stopped Spark web UI at http://10.0.2.15:4040
    [success] Total time: 13 s, completed Nov 27, 2016 3:17:12 PM
    16/11/27 15:17:12 INFO DiskBlockManager: Shutdown hook called

I can't understand, it's fine or no! Also when i try to load my file jar after the run, he dispaly also an error:

my command line look like:

spark-submit "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar

And the error this is:

Error: Cannot load main class from JAR file:/root/projectFilms/appfilms
Run with --help for usage help or --verbose for debug output
16/11/27 15:24:11 INFO Utils: Shutdown hook called

Please can you answers me!

Answer 1

The error is due to the fact that the SparkContext is not stopped, this is required in versions higher than Spark 2.x. This should be stopped to prevent this error by SparkContext.stop(), or sc.stop(). Inspiration for solving this error is gained from own experiences and the following sources: Spark Context, Spark Listener Bus error

Answer 2

You forgot to use --class Parameter spark-submit "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar

spark-submit --class "appfilms" --master local[4] target/scala-2.11/system-of-recommandation_2.11-1.0.jar.

Please note if appfilm belong to any package dont forgot to add package name as below packagename.appfilms

I believe this will suffice