Github user dbtsai commented on the issue:

    https://github.com/apache/spark/pull/22246
  
    @viirya The reflection trick we use in 
`scala.reflect.internal.util.ScalaClassLoader` doesn't work when the REPL is 
called from test. Do you have any idea about it? Thanks.
    
    ```
    sbt.ForkMain$ForkError: java.lang.NoSuchMethodException: 
scala.reflect.internal.util.ScalaClassLoader$.savingContextLoader(scala.Function0)
        at java.lang.Class.getDeclaredMethod(Class.java:2130)
        at org.apache.spark.repl.SparkILoop.runClosure(SparkILoop.scala:156)
        at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:178)
        at org.apache.spark.repl.Main$.doMain(Main.scala:78)
        at org.apache.spark.repl.ReplSuite.runInterpreter(ReplSuite.scala:56)
        at 
org.apache.spark.repl.ReplSuite$$anonfun$11.apply(ReplSuite.scala:141)
    ```
    
    @srowen The other two files in 2.11 can not be compiled in 2.12 . I removed 
the POM hack as well. Thanks for pointing out.
    



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