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From "Sean Owen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-26839) on JDK11, IsolatedClientLoader must be able to load java.sql classes
Date Thu, 28 Feb 2019 04:22:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-26839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780085#comment-16780085
] 

Sean Owen commented on SPARK-26839:
-----------------------------------

Sure. It may be that we need to access the platform classloader and not system classloader
in Java 9+. I suspect the issue is somewhere in there as this was the key classloading change
and one that would matter here

> 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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