How to get constructor by inexact type of parameters?

I need to find a constructor, which can accept both class and it's superclass.

The get method does not work, causing NoSuchMethodException:

package tests.java;

import java.lang.reflect.Constructor;

public class Try_ConstructorReflection {

    public static class A {

    }

    public static class A1 extends A {

    }

    public static class A2 extends A {

    }

    public static class B {
        public B(A a) {
        }
    }

    public static class B1 {
        public B1(A1 a) {
        }
    }

    public static class B2 {
        public B2(A2 a) {
        }
    }

    public static void main(String[] args) throws NoSuchMethodException, SecurityException {

        Class<?> cls = B.class;

        Constructor<?> cons = cls.getConstructor(B1.class);

        System.out.println(cons.toString());

    }

}

Is the only way to accomplish the task is to enumerate all constructor manually with getConstructors() ?