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https://issues.apache.org/jira/browse/SPARK-26839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16789706#comment-16789706
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Sean Owen commented on SPARK-26839:
-----------------------------------
I'll open my WIP PR on this.
I am not sure datanucleus is the issue after all. What is an issue for sure is
IsolatedClientLoader. In "builtin" mode, it tries to get all the JARs from the
current ClassLoader. These aren't available anymore in Java 9+. I tried just
avoiding making a new URLClassLoader with these JARs in this case, but got some
more CNFEs. I may need some extra eyes on this. PR coming.
> 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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