Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/11178#issuecomment-195159014
Modified the code to give more detail in the error message:
```
Error instrumenting class:org.apache.spark.deploy.history.HistoryServer$
java.lang.AssertionError: assertion failed: no symbol could be loaded from
class org.apache.spark.deploy.history.HistoryServer$ in package history with
name HistoryServer$ and classloader sun.misc.Launcher$AppClassLoader@1b6d3586
at
scala.reflect.runtime.JavaMirrors$JavaMirror.scala$reflect$runtime$JavaMirrors$JavaMirror$$classToScala1(JavaMirrors.scala:1020)
at
scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$classToScala$1.apply(JavaMirrors.scala:979)
at
scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$classToScala$1.apply(JavaMirrors.scala:979)
at
scala.reflect.runtime.JavaMirrors$JavaMirror$$anonfun$toScala$1.apply(JavaMirrors.scala:97)
at
scala.reflect.runtime.TwoWayCaches$TwoWayCache$$anonfun$toScala$1.apply(TwoWayCaches.scala:39)
at scala.reflect.runtime.Gil$class.gilSynchronized(Gil.scala:19)
at
scala.reflect.runtime.JavaUniverse.gilSynchronized(JavaUniverse.scala:16)
at
scala.reflect.runtime.TwoWayCaches$TwoWayCache.toScala(TwoWayCaches.scala:34)
at
scala.reflect.runtime.JavaMirrors$JavaMirror.toScala(JavaMirrors.scala:95)
at
scala.reflect.runtime.JavaMirrors$JavaMirror.classToScala(JavaMirrors.scala:979)
at
scala.reflect.runtime.JavaMirrors$JavaMirror.classSymbol(JavaMirrors.scala:196)
at
scala.reflect.runtime.JavaMirrors$JavaMirror.classSymbol(JavaMirrors.scala:54)
at
org.apache.spark.tools.GenerateMIMAIgnore$$anonfun$privateWithin$1.apply(GenerateMIMAIgnore.scala:71)
at
org.apache.spark.tools.GenerateMIMAIgnore$$anonfun$privateWithin$1.apply(GenerateMIMAIgnore.scala:69)
at
scala.collection.immutable.HashSet$HashSet1.foreach(HashSet.scala:322)
at
scala.collection.immutable.HashSet$HashTrieSet.foreach(HashSet.scala:978)
at
scala.collection.immutable.HashSet$HashTrieSet.foreach(HashSet.scala:978)
at
scala.collection.immutable.HashSet$HashTrieSet.foreach(HashSet.scala:978)
at
org.apache.spark.tools.GenerateMIMAIgnore$.privateWithin(GenerateMIMAIgnore.scala:69)
at
org.apache.spark.tools.GenerateMIMAIgnore$.main(GenerateMIMAIgnore.scala:135)
at
org.apache.spark.tools.GenerateMIMAIgnore.main(GenerateMIMAIgnore.scala)
```
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