Scala Option(null) expected as None but I got Some(0)

Question

val i: java.lang.Integer = null
val o: Option[Int] = Option(i) // This yields Some(0)

What is the safe wa

Answer 1

This seems to be happening because you are creating the Option, and converting it to an Int in one step (@MarioGalic's answer explains why this is happening).

This does what you want:

scala> val o: java.lang.Integer = null
o: Integer = null

scala> val i: Option[Int] = Option(o).map(_.toInt)
i: Option[Int] = None

scala> val o1: java.lang.Integer = 1
o1: Integer = 1

scala> val i1: Option[Int] = Option(o1).map(_.toInt)
i1: Option[Int] = Some(1)