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https://issues.apache.org/jira/browse/SPARK-3944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14172063#comment-14172063
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Apache Spark commented on SPARK-3944:
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User 'Shiti' has created a pull request for this issue:
https://github.com/apache/spark/pull/2810
> Utils.resolveURI fails on upgrading scalaVersion to 2.11.2
> ----------------------------------------------------------
>
> Key: SPARK-3944
> URL: https://issues.apache.org/jira/browse/SPARK-3944
> Project: Spark
> Issue Type: Sub-task
> Components: Spark Core
> Affects Versions: 1.1.0
> Reporter: Shiti Saxena
> Assignee: Shiti Saxena
> Fix For: 1.2.0
>
>
> The method tries to match a String (`uri.getScheme`) to obtain the result.
> The value from `uri.getScheme` can be null.
> Pattern matching using Regex when String value is null throws NPE in Scala
> 2.11.2. whereas it works in 2.10.4
> Running the same code snippet gives different results
> {noformat}
> Welcome to Scala version 2.10.4 (Java HotSpot(TM) 64-Bit Server VM, Java
> 1.7.0_60).
> Type in expressions to have them evaluated.
> Type :help for more information.
> scala> val pattern = "(.*)".r
> pattern: scala.util.matching.Regex = (.*)
> scala> val x:String = null
> x: String = null
> scala> x match { case pattern(x) => println("Success")
> | case null => println("Fail")
> | }
> Fail
> scala>
> {noformat}
> {noformat}
> Welcome to Scala version 2.11.2 (Java HotSpot(TM) 64-Bit Server VM, Java
> 1.7.0_60).
> Type in expressions to have them evaluated.
> Type :help for more information.
> scala> val pattern = "(.*)".r
> pattern: scala.util.matching.Regex = (.*)
> scala> val x:String = null
> x: String = null
> scala> x match { case pattern(x) => println("Success")
> | case null => println("Fail")
> | }
> java.lang.NullPointerException
> at java.util.regex.Matcher.getTextLength(Matcher.java:1234)
> at java.util.regex.Matcher.reset(Matcher.java:308)
> at java.util.regex.Matcher.<init>(Matcher.java:228)
> at java.util.regex.Pattern.matcher(Pattern.java:1088)
> at scala.util.matching.Regex.unapplySeq(Regex.scala:206)
> ... 47 elided
> {noformat}
> This happens because, In scala 2.11.2 "the unapply" tries to match the regex
> even if the input is null. While in scala 2.10 it matches the correct case
> with out unapplying.
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