FULL PRODUCT VERSION :
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
When:
- creating a Comparator by using the static method Comparator.comparing
- and a method reference is used as the "keyExtractor" argument
- and the return type of the method reference does not implement Comparable
then javac gives an inappropriate error message saying "non-static method XXX cannot be referenced from a static context". This is not helpful at all. Instead it should ideally give an error message saying "the key type K does not implement Comparable<K>".

Please see "Steps to Reproduce" for further information.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
save the test case to Issue.java
run javac Issue.java

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
A compiler error saying something like:
the key type K does not implement Comparable<K>
ACTUAL -
A long compiler error, at the very end saying:

invalid method reference
non-static method getInputStream() cannot be referenced from a static context


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Comparator;

public class Issue {

Comparator<Process> cmp = Comparator.comparing(Process::getInputStream);

}

---------- END SOURCE ----------