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https://issues.apache.org/jira/browse/SPARK-27122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16792299#comment-16792299
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Ajith S commented on SPARK-27122:
---------------------------------
I can reproduce this issue even in Java8. I would like to work on this.
> YARN test failures in Java 9+
> -----------------------------
>
> Key: SPARK-27122
> URL: https://issues.apache.org/jira/browse/SPARK-27122
> Project: Spark
> Issue Type: Sub-task
> Components: YARN
> Affects Versions: 3.0.0
> Reporter: Sean Owen
> Priority: Major
>
> Currently on Java 11:
> {code}
> YarnSchedulerBackendSuite:
> - RequestExecutors reflects node blacklist and is serializable
> - Respect user filters when adding AM IP filter *** FAILED ***
> java.lang.ClassCastException:
> org.spark_project.jetty.servlet.ServletContextHandler cannot be cast to
> org.eclipse.jetty.servlet.ServletContextHandler
> at
> scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:237)
> at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:62)
> at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:55)
> at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:49)
> at scala.collection.TraversableLike.map(TraversableLike.scala:237)
> at scala.collection.TraversableLike.map$(TraversableLike.scala:230)
> at scala.collection.AbstractTraversable.map(Traversable.scala:108)
> at
> org.apache.spark.scheduler.cluster.YarnSchedulerBackend.$anonfun$addWebUIFilter$2(YarnSchedulerBackend.scala:183)
> at
> org.apache.spark.scheduler.cluster.YarnSchedulerBackend.$anonfun$addWebUIFilter$2$adapted(YarnSchedulerBackend.scala:174)
> at scala.Option.foreach(Option.scala:274)
> ...
> {code}
> This looks like a classpath issue, probably ultimately related to the same
> classloader issues in https://issues.apache.org/jira/browse/SPARK-26839
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