How to run a spark example program in Intellij IDEA

First on the command line from the root of the downloaded spark project I ran ``` mvn package ``` It was successful. Then an intellij project was created by importing the spark pom.xml. In the IDE the example class appears fine: all of the libraries are found. This can be viewed in the screenshot. However , when attempting to run the main() a ClassNotFoundException on SparkContext occurs. Why can Intellij not simply load and run this maven based scala program? And what can be done as a workaround? As one can see below, the SparkContext is looking fine in the IDE: but then is not found when attempting to run: The test was run by right clicking inside main(): .. and selecting Run GroupByTest It gives ``` Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/SparkContext at org.apache.spark.examples.GroupByTest$.main(GroupByTest.scala:36) at org.apache.spark.examples.GroupByTest.main(GroupByTest.scala) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) Caused by: java.lang.ClassNotFoundException: org.apache.spark.SparkContext at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more ``` Here is the run configuration: