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https://issues.apache.org/jira/browse/SPARK-10550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14743572#comment-14743572
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shao lo commented on SPARK-10550:
---------------------------------
There are parts that are marked as experimental. This is not in that category.
The reason to make a class have protected access is exactly to promote
extension.
> SQLListener error constructing extended SQLContext
> ---------------------------------------------------
>
> Key: SPARK-10550
> URL: https://issues.apache.org/jira/browse/SPARK-10550
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.0
> Reporter: shao lo
> Priority: Minor
>
> With spark 1.4.1 I was able to created a custom SQLContext class. With spark
> 1.5.0, I now get an error calling the super class constructor. The problem
> is related to this new code that was added between 1.4.1 and 1.5.0
> // `listener` should be only used in the driver
> @transient private[sql] val listener = new SQLListener(this)
> sparkContext.addSparkListener(listener)
> sparkContext.ui.foreach(new SQLTab(this, _))
> ..which generates
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.spark.sql.execution.ui.SQLListener.<init>(SQLListener.scala:34)
> at org.apache.spark.sql.SQLContext.<init>(SQLContext.scala:77)
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