Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/478#issuecomment-78228121
As I wrote in JIRA, Fields of Scala class (not case class) are private.
([Reference](http://stackoverflow.com/questions/1589603/scala-set-a-field-value-reflectively-from-field-name))
Because fields declared by `val` keyword don't have setter, Flink
TypeExtractor fails to extract information of POJO example in documentation. I
attached a result of sample type extraction in
[JIRA](https://issues.apache.org/jira/browse/FLINK-1654?focusedCommentId=14348124&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14348124).
Flink TypeExtractor deals with Scala case class differently. Case classes
are dealt like Scala tuple.
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