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https://issues.apache.org/jira/browse/SPARK-1863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-1863.
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Resolution: Incomplete
> Allowing user jars to take precedence over Spark jars does not work as
> expected
> -------------------------------------------------------------------------------
>
> Key: SPARK-1863
> URL: https://issues.apache.org/jira/browse/SPARK-1863
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: koert kuipers
> Priority: Minor
> Labels: bulk-closed
>
> See here:
> http://apache-spark-user-list.1001560.n3.nabble.com/java-serialization-errors-with-spark-files-userClassPathFirst-true-td5832.html
> The issue seems to be that within ChildExecutorURLClassLoader userClassLoader
> has no visibility on classes managed by parentClassLoader because their is no
> parent/child relationship. What this means that if a class is loaded by
> userClassLoader and it refers to a class loaded by parentClassLoader you get
> a NoClassDefFoundError.
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