A DESCRIPTION OF THE REQUEST :
Java Version:

java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b16, mixed mode)

Suggest we have

Map<String, Integer> map

And we want to have a list of it's elements sorted by Integer ascending

map.entrySet().stream().sorted((o1, o2) -> o1.getValue() - o2.getValue())

Which can be replaced with

map.entrySet().stream().sorted(Comparator.comparingInt(Map.Entry::getValue))

Now we want to sort it by Integer desc

map.entrySet().stream().sorted((o1, o2) -> o2.getValue() - o1.getValue())

Which we assume is obvious to replace with

map.entrySet().stream().sorted(Comparator.comparingInt(Map.Entry::getValue).reversed())

That gives us compilation error: Not-static method cannot be referenced from a static context.

The reason is that Comparator.reversed() method calls static Collections.reverseOrder inside.

 Reproducibility:
Can be reproduced anytime
 




JUSTIFICATION :
This realization of Comparator.reverse() method breaks the opportunity to use Method Reference inside. There is no natural conditions which restricts doing this.
It's also illogically that we can write:
   sorted(Comparator.comparingInt(Map.Entry::getValue))
but cannot:
  .sorted(Comparator.comparingInt(Map.Entry::getValue).reversed())
That makes writing functional code in Java more complicated.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
sorted(Comparator.comparingInt(Map.Entry::getValue).reversed())
 is reverse sorting for
 sorted(Comparator.comparingInt(Map.Entry::getValue))

  

ACTUAL -
sorted(Comparator.comparingInt(Map.Entry::getValue).reversed()) do not compile

---------- BEGIN SOURCE ----------
import java.util.*;
import java.util.function.Consumer;
import java.util.stream.Collectors;

class Example {

    void bug() {
        Map<String, Integer> map = new HashMap();
      
   map.entrySet().stream().sorted(Comparator.comparingInt(Map.Entry::getValue).reversed());
    }
}

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