@brumla you don't understand the question. Let me give sample source:

class Test(val thing:String, val other:Int)

public class Authority implements GrantedAuthority {

    private User user;


    private String role;

    public Authority(User user, String role) {
        this.user = user;
        this.role = role;

    }

}

test code:

public class Foo {

    public static void main(String[] args) {
        Arrays.stream(Test.class.getDeclaredConstructors()).map(Constructor::getParameters)
                .flatMap(Arrays::stream).map(Parameter::getName).forEach(System.out::println);

        Arrays.stream(Authority.class.getDeclaredConstructors()).map(Constructor::getParameters)
                .flatMap(Arrays::stream).map(Parameter::getName).forEach(System.out::println);
    }
}

output: arg0 arg1 user role if you compile the java code with

-parameters

you get the bottom 2 lines with java. Without it, you get the same as the 2 kotlin lines

chb0kotlin: Kotlin does not support the parameter name format that Java 8 uses yet. You can however use the Kotlin reflection library to get them using

KParameter::name

.

I need this reflection to work from inside of Java. Where can I submit an idea/request for this feature?

Apparently it was implemented already, it is just off by default. The compiler argument is

-java-parameters

.