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https://issues.apache.org/jira/browse/SPARK-19675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15875504#comment-15875504
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Kohki Nishio commented on SPARK-19675:
--------------------------------------
Here's a simple repro, both should say '/tmp/scala-library-2.11.0.jar', but
Class.forName loads classes from SystemClassLoader
{code}
val desiredLoader = new URLClassLoader(
Array(new URL("file:/tmp/scala-library-2.11.0.jar")),
null)
val executorLoader = new ExecutorClassLoader(
new SparkConf(),
null,
"",
desiredLoader,
false)
// Class.forName
val source1 = Class.forName("scala.Option", false, executorLoader)
.getProtectionDomain
.getCodeSource
.getLocation
println(s"scala.Option is loaded from $source1")
// Class.forName
val source2 = executorLoader.findClass("scala.Option")
.getProtectionDomain
.getCodeSource
.getLocation
println(s"scala.Option is loaded from $source2")
{code}
{code}
[Class.forName] scala.Option is loaded from
file:/Users/xxx/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.11.8.jar
[loadClass] scala.Option is loaded from file:/tmp/scala-library-2.11.0.jar
{code}
> ExecutorClassLoader loads classes from SystemClassLoader
> --------------------------------------------------------
>
> Key: SPARK-19675
> URL: https://issues.apache.org/jira/browse/SPARK-19675
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.0, 2.2.0
> Environment: sbt / Play Framework
> Reporter: Kohki Nishio
> Priority: Minor
>
> Spark Executor loads classes from SystemClassLoader which contains
> sbt-launch.jar and it contains Scala2.10 binary, however Spark itself is
> built on Scala2.11, thus it's throwing InvalidClassException
> java.io.InvalidClassException: scala.Option; local class incompatible: stream
> classdesc serialVersionUID = -114498752079829388, local class
> serialVersionUID = 5081326844987135632
> at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:616)
> at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1630)
> at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
> at
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1630)
> at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1521)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1781)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353)
> at
> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2018)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1942)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1808)
> ExecutorClassLoader's desired class loder (parentLoader) actually contains
> the correct path (scala-library-2.11.8.jar) but it is not being used.
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