NoSuchElementException: None.get on sealed trait deserialization with $type tag #500
Description
Version
3.1.0
Behaviour
Following code throws a java.util.NoSuchElementException: None.get
//> using lib "com.lihaoyi::upickle:3.1.0"
import upickle.default.*
import upickle.implicits.*
sealed trait ClusterEvent derives ReadWriter {
val tpe: String
}
case class MemberUp(tpe: String) extends ClusterEvent derives ReadWriter
val str =
"""
{
"tpe": "MemberUp"
}
""".trim
@main
def main =
println(read[ClusterEvent](str))Full stack trace:
Exception in thread "main" java.util.NoSuchElementException: None.get
at scala.None$.get(Option.scala:627)
at scala.None$.get(Option.scala:626)
at upickle.AttributeTagged$$anon$6.visitEnd(Api.scala:281)
at ujson.CharParser.liftedTree1$1(CharParser.scala:512)
at ujson.CharParser.tryCloseCollection(CharParser.scala:512)
at ujson.CharParser.parseNested(CharParser.scala:478)
at ujson.CharParser.parseTopLevel0(CharParser.scala:339)
at ujson.CharParser.parseTopLevel(CharParser.scala:323)
at ujson.CharParser.parse(CharParser.scala:72)
at ujson.StringParser$.transform(StringParser.scala:28)
at ujson.StringParser$.transform(StringParser.scala:28)
at ujson.Readable$fromTransformer.transform(Readable.scala:16)
at upickle.Api.read$$anonfun$1(Api.scala:38)
at upickle.core.TraceVisitor$.withTrace(TraceVisitor.scala:18)
at upickle.Api.read(Api.scala:38)
at upickle.Api.read$(Api.scala:17)
at upickle.default$.read(Api.scala:158)
at Test$package$.main(Test.scala:21)
at main.main(Test.scala:19)
Expected behaviour
Either working deserialization or a clear library error. It shows two issues: One is the None.get, and the other is that it is hard to customize how the case class inheriting the sealed trait is selected.