My app is in scala and a quick search on serializing a scala class seems to
have potential issues with different versions of scala (I could be wrong as
I did a quick search).

Is it generally just a better idea to use plain old java classes for kafka

i.e. I simply use jackson like:

public class User implements Serializable {

// kakfa
val it = stream.iterator()
while (it.hasNext()) {
  val messageAndTopic =

  val user = mapper.readValue(messageAndTopic.message(), classOf[User])

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