Ambiguous overload using JDK 11

[noti0na1]

Minimized code

The following code can be compiled using JDK 8. However, it will output ambiguous overload error when using JDK 11.

Environment:
Ubuntu
openjdk 1.8.0_275
openjdk 11.0.9.1

val decoderOut = java.nio.CharBuffer.allocate(1000)
val p = decoderOut.position

Output

-- [E051] Reference Error: Stest.scala:7:19 ------------------------------------
7 |val p = decoderOut.position
  |        ^^^^^^^^^^^^^^^^^^^
  |Ambiguous overload. The overloaded alternatives of method position in class CharBuffer with types
  | (x$0: Int): java.nio.CharBuffer
  | (): Int
  |both match expected type <?>

Expectation

The compiler shoud find and use position(): Int here.

[som-snytt]

Same in Scala 2, as the non-nullary method is overridden for more specific return type. Workaround:

Starting scala3 REPL...
scala> val decoderOut: java.nio.Buffer = java.nio.CharBuffer.allocate(5)
val decoderOut: java.nio.Buffer =

scala> val p = decoderOut.position
val p: Int = 0

or just use parens.

[liufengyun]

It can also be done with an explicit ():

val p = decoderOut.position()

Thus, I don't think this needs a fix.

[smarter]

I'm not sure, we're supposed to support calling Java methods without (), and even if we can't for some reason, the error message here is not very clear.