[jira] [Created] (SPARK-26839) on J11, IsolatedClientLoader must be able to load java.sql classes

["Imran Rashid (JIRA)" <ji...@apache.org>]

Imran Rashid created SPARK-26839:
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             Summary: on J11, 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


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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