Github user takezoe commented on a diff in the pull request:

    
https://github.com/apache/incubator-predictionio/pull/387#discussion_r120153688
  
    --- Diff: 
data/src/main/scala/org/apache/predictionio/data/storage/Storage.scala ---
    @@ -306,9 +306,18 @@ object Storage extends Logging {
         }
         val constructor = clazz.getConstructors()(0)
         try {
    -      constructor.newInstance(ctorArgs: _*).
    +      val instance = constructor.newInstance(ctorArgs: _*).
             asInstanceOf[T]
    +      try {
    +        val init = instance.getClass.getMethod("init")
    +        init.invoke(instance)
    --- End diff --
    
    In my opinion,  if `init()` method is necessary for data objects, we should 
define a trait (e.g. `Initializable`) which has a `init()` method and cast by 
pattern match here to call `init()` method.
    
    But since this is just my thought, we need opinion from other committers as 
well.


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