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https://issues.apache.org/jira/browse/SPARK-26839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16762219#comment-16762219
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Imran Rashid commented on SPARK-26839:
--------------------------------------
I found that just on a regular scala 2.12 shell in jdk 1.8,
{{ClassLoader.getSystemClassLoader.getParent.getParent}} also returns null, so
it doesn't seem to just be jdk11.
{noformat}
> scala
Welcome to Scala 2.12.2 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_65).
Type in expressions for evaluation. Or try :help.
scala> ClassLoader.getSystemClassLoader.getParent.getParent
res0: ClassLoader = null
{noformat}
> on JDK11, IsolatedClientLoader must be able to load java.sql classes
> --------------------------------------------------------------------
>
> Key: SPARK-26839
> URL: https://issues.apache.org/jira/browse/SPARK-26839
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Imran Rashid
> Priority: Major
>
> This might be very specific to my fork & a kind of weird system setup I'm
> working on, I haven't completely confirmed yet, but I wanted to report it
> anyway in case anybody else sees this.
> When I try to do anything which touches the metastore on java11, I
> immediately get errors from IsolatedClientLoader that it can't load anything
> in java.sql. eg.
> {noformat}
> scala> spark.sql("show tables").show()
> java.lang.ClassNotFoundException: java.lang.NoClassDefFoundError:
> java/sql/SQLTransientException when creating Hive client using classpath:
> file:/home/systest/jdk-11.0.2/, ...
> ...
> Caused by: java.lang.ClassNotFoundException: java.sql.SQLTransientException
> at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
> at
> org.apache.spark.sql.hive.client.IsolatedClientLoader$$anon$1.doLoadClass(IsolatedClientLoader.scala:230)
> at
> org.apache.spark.sql.hive.client.IsolatedClientLoader$$anon$1.loadClass(IsolatedClientLoader.scala:219)
> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
> {noformat}
> After a bit of debugging, I also discovered that the {{rootClassLoader}} is
> {{null}} in {{IsolatedClientLoader}}. I think this would work if either
> {{rootClassLoader}} could load those classes, or if {{isShared()}} was
> changed to allow any class starting with "java." (I'm not sure why it only
> allows "java.lang" and "java.net" currently.)
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