[ 
https://issues.apache.org/jira/browse/FLINK-16969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Jeff Zhang updated FLINK-16969:
-------------------------------
    Description: 
{code:java}
case class WC(word: String, count: Int)
val wordCounts = benv.fromElements(WC("hello", 1),WC("world", 2), WC("world", 
8))
wordCounts.collect(){code}

Get the following exception
{code}
java.lang.IllegalArgumentException: requirement failed:
The class WC is an instance class, meaning it is not a member of a
toplevel object, or of an object contained in a toplevel object,
therefore it requires an outer instance to be instantiated, but we don't have a
reference to the outer instance. Please consider changing the outer class to an 
object.

  at scala.Predef$.require(Predef.scala:224)
  at 
org.apache.flink.api.scala.typeutils.ScalaCaseClassSerializer$.lookupConstructor(ScalaCaseClassSerializer.scala:90)
  at 
org.apache.flink.api.scala.typeutils.ScalaCaseClassSerializer.<init>(ScalaCaseClassSerializer.scala:46)
  ... 66 elided

{code}

  was:
{code:java}
case class WC(word: String, count: Int)val wordCounts = 
benv.fromElements(WC("hello", 1),WC("world", 2), WC("world", 8))
wordCounts.collect()

java.lang.IllegalArgumentException: requirement failed:The class WC is an 
instance class, meaning it is not a member of atoplevel object, or of an object 
contained in a toplevel object,therefore it requires an outer instance to be 
instantiated, but we don't have areference to the outer instance. Please 
consider changing the outer class to an object.
  at scala.Predef$.require(Predef.scala:224)  at 
org.apache.flink.api.scala.typeutils.ScalaCaseClassSerializer$.lookupConstructor(ScalaCaseClassSerializer.scala:90)
  at 
org.apache.flink.api.scala.typeutils.ScalaCaseClassSerializer.<init>(ScalaCaseClassSerializer.scala:46)
  ... 66 elided{code}


> Unable to use case class in flink scala shell
> ---------------------------------------------
>
>                 Key: FLINK-16969
>                 URL: https://issues.apache.org/jira/browse/FLINK-16969
>             Project: Flink
>          Issue Type: Bug
>          Components: Scala Shell
>    Affects Versions: 1.10.0
>            Reporter: Jeff Zhang
>            Priority: Major
>
> {code:java}
> case class WC(word: String, count: Int)
> val wordCounts = benv.fromElements(WC("hello", 1),WC("world", 2), WC("world", 
> 8))
> wordCounts.collect(){code}
> Get the following exception
> {code}
> java.lang.IllegalArgumentException: requirement failed:
> The class WC is an instance class, meaning it is not a member of a
> toplevel object, or of an object contained in a toplevel object,
> therefore it requires an outer instance to be instantiated, but we don't have 
> a
> reference to the outer instance. Please consider changing the outer class to 
> an object.
>   at scala.Predef$.require(Predef.scala:224)
>   at 
> org.apache.flink.api.scala.typeutils.ScalaCaseClassSerializer$.lookupConstructor(ScalaCaseClassSerializer.scala:90)
>   at 
> org.apache.flink.api.scala.typeutils.ScalaCaseClassSerializer.<init>(ScalaCaseClassSerializer.scala:46)
>   ... 66 elided
> {code}



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