Either type cannot be deserialized

[kgignatyev]

I have code that reproduces problem at:
https://github.com/kgignatyev/misc/tree/master/scala-databind-issue

serialization happens fine, but deserialization fails

{"contents":[{"l":"some string"},{"r":{"id":"a","cType":"widget"}}]}

class EitherHandlingSpec extends FunSuite {

test("can handle 'either'") {
val p = new ContentPage
p.contents += Left("some string")
p.contents += Right(ContentPointer("a","widget"))
val ser = McyObjectMapper.mapper.writeValueAsString(p)
println("ser:\n\n"+ ser)

val newPage = McyObjectMapper.mapper.readValue(ser, classOf[ContentPage])

assert(newPage.contents.length==2)

}

}

class ContentPage {
var contents:ListBuffer[Either[String,ContentPointer]] = ListBuffer()
}

case class ContentPointer (var id:String, var cType:String )

[nbauernfeind]

A shorter example of the same issue:

object T extends App {
  val mapper = new ObjectMapper with ScalaObjectMapper
  mapper.registerModule(DefaultScalaModule)

  val ser = mapper.writeValueAsString(Seq(Left("left")))
  println("ser:\n\n"+ ser)

  val newPage = mapper.readValue[Seq[Either[String, String]]](ser)
}

The EitherDeserializer.deserialize is being invoked twice. The second time jp.nextToken() is null which yields to key being null and fails the match in method deserializeEither. I don't know under what conditions this method is invoked, but it seems to think that there is another element in the Seq even though there isn't.

Note that deserializing a Left or a Right not wrapped in a Seq works fine.

[nbauernfeind]

This was fixed in 78882ed and has a regression test.