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Regarding json serialisation, at the time I was using scala, I found quite "unusual" that the play library could not deserialize a json with more than 26 fields (or something like that). I hope they fixed it in the newer versions, but still I don't get why to rewrite all the libs from scratch, when java has good ones available.

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As asked (and answered) here[0], it used to be a Scala case class limitation. There are tricks to do it anyway, like manually mapping fields by writing your own JsReads or JsWrites for your object.

[0] http://stackoverflow.com/questions/20258417/how-to-get-aroun...

It was 22 fields and the problem was not serializing/deserializing, but it was a problem with the Scala functions and tuples system not supporting case classes with more than 21 fields. This limitation has been removed since Scala 2.11.

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