[GitHub] spark pull request: [SPARK-14585][ML][WIP] Provide accessor method...

[pravingadakh <gi...@git.apache.org>]

Github user pravingadakh commented on the pull request:

    https://github.com/apache/spark/pull/12420#issuecomment-216318404
  
    @jkbradley I have stumbled across an issue, would really appreciate your input. Have a look at this method:
    
    ```
    def getStage[T <: PipelineStage : ClassTag](i: Int): T = {
        getStages(i) match {
          case stage: T => stage
          case stage => throw new IllegalArgumentException(
            s"Expected stage of type ${stage.getClass.getName}"
          )
        }
      }
    ```
    
    How do I avoid usage of `ClassTag` here (since those are not so java friendly)? Also I'm a bit skeptical about the error message.


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