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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