Why are case objects serializable and case classes not?

Question

I am playing with this example http://scala.sygneca.com/code/remoteactors to learn how remote actors work in Scala (2.8.0). In particular I slightly modified how the messages se

Answer 1

Case classes without parameters are meaningless and deprecated. And I see no Serializable in Scala, just serializable. Does it work if you fix these things?